| Revenue | $1.5B | $1.9B | $1.6B | $1.3B | $1.5B | $2B | $1.9B | $1.7B |
| Capital investments accrued but not yet paid | $59.8M | — | — | $202.2M | $181.4M | — | — | $381.6M |
| Cash Provided by (Used in) Investing Activity, Including Discontinued Operation | -$189M | -$226.7M | -$298.6M | -$63.1M | -$142.7M | -$348.7M | -$330.5M | -$334.7M |
| Payments to Acquire Marketable Securities | $167.8M | $162.3M | — | $169.7M | $161.7M | $256.6M | — | $258.5M |
| Payments to Acquire Short-Term Investments | $167.8M | $162.3M | $126.9M | $169.7M | $161.7M | $256.6M | $240.4M | $258.5M |
| Net Change in Cash and Restricted Cash | -$38.4M | -$120.5M | — | -$76M | $469.8M | $28.3M | — | -$257M |
| Capital Expenditures | $166.4M | $195.5M | $285.7M | $79.9M | $146.2M | $246.4M | $432.1M | $224.6M |
| Payments to Acquire Property, Plant, and Equipment | $166.4M | $195.5M | $285.7M | $79.9M | $146.2M | $246.4M | $432.1M | $224.6M |
| Property, plant, and equipment additions | $166.4M | $195.5M | — | $79.9M | $146.2M | $246.4M | — | $224.6M |
| Depreciation | $149.8M | $150.5M | — | $153.7M | $158.7M | $163.5M | — | $170.8M |
| Cash Provided by (Used in) Operating Activity, Including Discontinued Operation | $224.8M | $164.2M | $537.6M | $24.1M | $258.5M | $168.5M | $644.5M | $145.1M |
| Proceeds from Maturities, Prepayments and Calls of Short-Term Investments | $142.2M | $103.6M | $106.6M | $147.8M | $108.4M | $94.6M | $79.1M | $127.3M |
| Change in Operating Capital | — | $113.7M | — | $157.5M | — | $120.4M | — | $103.9M |
| Reclassifications Net of Tax | $66.9M | $122.6M | — | $21.1M | $54.4M | $126.6M | — | $83.4M |
| Comprehensive Income Including Noncontrolling Interest | $64.6M | $128.7M | — | $24.4M | $57.3M | $126.3M | — | $82.4M |
| Comprehensive Income Attributable to Parent | $64.6M | $128.7M | — | $24.4M | $57.3M | $126.3M | — | $82.4M |
| Comprehensive Income Including Noncontrolling Interest | $64.6M | $128.7M | — | $24.4M | $57.3M | $126.3M | — | $82.4M |
| Comprehensive income (loss), including noncontrolling interest | $64.6M | $128.7M | — | $24.4M | $57.3M | $126.3M | — | $82.4M |
| Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest | $64.6M | $128.7M | — | $24.4M | $57.3M | $126.3M | — | $82.4M |
| Comprehensive Income (Loss), Total | $64.6M | $128.7M | — | $24.4M | $57.3M | $126.3M | — | $82.4M |
| Comprehensive Income, Including Noncontrolling Interest | $64.6M | $128.7M | — | $24.4M | $57.3M | $126.3M | — | $82.4M |
| Comprehensive Income Including Noncontrolling Interest | $64.6M | $128.7M | — | $24.4M | $57.3M | $126.3M | — | $82.4M |
| Total Comprehensive Income | $64.6M | $128.7M | — | $24.4M | $57.3M | $126.3M | — | $82.4M |
| Comprehensive Income | $64.6M | $128.7M | — | $24.4M | $57.3M | $126.3M | — | $82.4M |
| Comprehensive Income (Loss), Net of Tax, Attributable to Parent | $64.2M | $128.6M | — | $23.6M | $56.7M | $126.2M | — | $81.8M |
| Cash Provided by (Used in) Financing Activity, Including Discontinued Operation | -$68.6M | -$68.9M | -$53.1M | -$42.3M | $350.5M | $210.6M | — | -$67M |
| Repayments of Long-Term Debt | — | $30.7M | — | $25.5M | $86.7M | $248.4M | — | $27.7M |
| Dividends, Common Stock, Cash | $19.4M | $19.4M | — | $20.4M | $20.5M | $20.5M | — | $20.7M |
| Payments of Ordinary Dividends, Common Stock | $19.4M | $19.4M | $120.4M | $0 | $40.9M | $20.4M | $20.6M | $20.7M |
| Cash Dividends, Common Stock | $19.4M | $19.4M | $120.4M | $0 | $40.9M | $20.4M | $20.6M | $20.7M |
| Payments For Derivative Instrument Investing Activities | $18.5M | $15.3M | — | $16M | $13M | $16.8M | — | $16.7M |
| Realized gains on translated earnings contracts and other | $4.3M | $27.1M | — | $16.7M | $25.2M | $10M | — | $14.9M |
| Short-term investments sold | $14.9M | $13.4M | $21.1M | $32.3M | $43.7M | $64.9M | $165.5M | $14.6M |
| Finance Lease Principal Paid | $19M | $17.7M | — | $15.7M | $15M | $13.6M | — | $14.5M |
| Finance Lease Principal Payments | $19M | $17.7M | $15.9M | $15.7M | $15M | $13.6M | $45.7M | $14.5M |
| Other income, net (Note 6) | $15.8M | $8.1M | $18.2M | $11.1M | $8.1M | $16.7M | $16.8M | $13.7M |
| Dispositions of property, plant, and equipment | $1.4M | $284K | — | $4.2M | $553K | $380K | $103.6M | $7.2M |
| Share-based compensation expense related to employee stock plans | $6.3M | $3.6M | — | $4.2M | $4.8M | $5.1M | — | $6.1M |
| Other Noncash Income (Expense) | -$3.9M | -$4.6M | — | -$6M | $4.7M | $1.4M | $6.5M | $5.9M |
| Share-Based Payment Tax Withholding Decrease | — | $725K | — | $1.3M | $162K | $256K | — | $5.3M |
| Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation | — | $725K | — | $1.3M | $162K | $256K | — | $5.3M |
| Financing — other | $1.3M | $603K | -$4.8M | -$1.1M | -$7M | — | -$1.7M | -$4.1M |
| ROU Asset Obtained - Finance Lease | $50.4M | $57.9M | — | $10.6M | $3.4M | $14.5M | — | $4M |
| Right Of Use Asset Obtained In Exchange For Finance Lease Liability | $50.4M | $57.9M | $23.8M | $10.6M | $3.4M | $14.5M | $31.4M | $4M |
| Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments | — | -$4.1M | — | -$2.9M | -$3.7M | -$3.8M | — | -$3.6M |
| Service cost | $3.4M | $3.5M | — | $3.3M | $3.4M | $3.4M | — | $3M |
| Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | $3.3M | $3.5M | — | $3.3M | $3.5M | $3.4M | — | $3M |
| OCI - Available-for-sale securities, net of tax | -$211K | $662K | — | $1.1M | $7K | $482K | — | -$2.5M |
| OCI Net Unrealized Gain (Loss) on Securities | -$211K | $662K | — | $1.1M | $7K | $482K | — | -$2.5M |
| OCI Available for Sale Securities Adjustment | -$211K | $662K | — | $1.1M | $7K | $482K | — | -$2.5M |
| Unrealized Gains on Available-for-Sale Securities | -$211K | $662K | — | $1.1M | $7K | $482K | — | -$2.5M |
| OCI - Available-for-Sale Securities, Net of Tax | -$211K | $662K | — | $1.1M | $7K | $482K | — | -$2.5M |
| Unrealized gains (losses) on available-for-sale securities | -$211K | $662K | — | $1.1M | $7K | $482K | — | -$2.5M |
| Other Comprehensive Income (Loss) | -$211K | $662K | — | $1.1M | $7K | $482K | — | -$2.5M |
| OCI Available for Sale Securities Adjustment, Net of Tax | -$211K | $662K | — | $1.1M | $7K | $482K | — | -$2.5M |
| OCI Unrealized Gain (Loss) on Securities, Pre-tax | -$211K | $662K | — | $1.1M | $7K | $482K | — | -$2.5M |
| Gain (Loss), Foreign Currency Transaction, before Tax | -$1.9M | -$8M | — | -$3.8M | -$7M | $62K | — | -$2.5M |
| Add - Incremental shares under stock-based compensation plans (in shares) | $1.6M | $1.4M | — | $991K | $716K | $1.1M | — | $2M |
| Proceeds from sale of cash equivalent investments | $10.8M | $1.5M | — | $2M | $5.5M | $12.9M | — | $2M |
| Interest cost | $1.4M | $1.5M | — | $1.4M | $1.5M | $1.5M | — | $1.6M |
| Other comprehensive income (loss), after-tax | -$2.7M | $6M | — | $2.5M | $2.3M | -$410K | — | -$1.6M |
| Other comprehensive income (loss) | -$2.7M | $6M | — | $2.5M | $2.3M | -$410K | — | -$1.6M |
| Other comprehensive income (loss), net of tax | -$2.4M | $5.5M | — | $3.9M | $2.4M | -$797K | — | $1.1M |
| Foreign currency translation gains (losses) | -$2.4M | $5.5M | — | $3.9M | $2.4M | -$797K | — | $1.1M |
| Foreign Currency Translation Adjustment, Net of Tax | -$2.4M | $5.5M | — | $3.9M | $2.4M | -$797K | — | $1.1M |
| Other investing activities, net | -$809K | -$2.1M | — | -$1.5M | -$178K | -$1.3M | — | -$1M |
| Payment for (Proceeds from) Other Investing Activity | -$809K | -$2.1M | -$2.8M | -$1.5M | -$178K | -$1.3M | -$3.4M | -$1M |
| OCI Attributable to Noncontrolling Interest | $361K | $121K | — | $725K | $635K | $93K | — | $615K |
| Less: comprehensive income attributable to noncontrolling interest | $361K | $121K | — | $725K | $635K | $93K | — | $615K |
| Net Income Loss Attributable To Noncontrolling Interest | $361K | $121K | — | $725K | $635K | $93K | — | $615K |
| Comprehensive Income Attributable to Noncontrolling Interests | $361K | $121K | — | $725K | $635K | $93K | — | $615K |
| Comprehensive Income, Noncontrolling Interest | $361K | $121K | — | $725K | $635K | $93K | — | $615K |
| Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture | $1.5M | $1.9M | — | $769K | $132K | $328K | — | $500K |
| Effect of Exchange Rate on Cash (Continuing Operations) | -$5.6M | — | — | $5.2M | $3.6M | — | — | -$282K |
| ROU Asset Obtained - Operating Lease | $7.1M | $17.1M | — | $395K | $587K | $9.2M | — | $239K |
| Defined Benefit Plan, Amortization of Gain (Loss) | $96K | $97K | — | $119K | $119K | $120K | — | $222K |
| Minority Interest Decrease From Distributions To Noncontrolling Interest Holders | $165K | $165K | — | $165K | $165K | $165K | — | $165K |
| OCI - Defined benefit plan, net of tax | $85K | $84K | — | $2.5M | $95K | $95K | — | $123K |
| Other Comprehensive Income (Loss) | $85K | $84K | — | $2.5M | $95K | $95K | — | $123K |
| OCI Defined Benefit Plan Net of Tax | $85K | $84K | — | $2.5M | $95K | $95K | — | $123K |
| Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | $85K | $84K | — | $2.5M | $95K | $95K | — | $123K |
| OCI Defined Benefit Plan, After Tax | $85K | $84K | — | $2.5M | $95K | $95K | — | $123K |
| OCI Pension Adjustments | $85K | $84K | — | $2.5M | $95K | $95K | — | $123K |
| OCI Pension Reclassification Adjustment, Pre-tax | $85K | $84K | — | $2.5M | $95K | $95K | — | $123K |
| OCI Defined Benefit Plan, Net of Tax | $85K | $84K | — | $2.5M | $95K | $95K | — | $123K |
| Stock options excluded as their inclusion would be anti-dilutive (in shares) | $0 | $0 | — | $38K | $984K | $18K | — | $22K |
| Other Nonoperating Income (Expense), Net | $71K | $248K | — | $382K | $92K | -$15K | — | -$3K |
| Number of Operating Segments | — | — | — | — | — | — | — | 1.00 |
| Concentration Risk Percentage1 | 100.0% | 100.0% | — | 100.0% | 100.0% | 100.0% | — | 100.0% |
| Number of operating segments | — | — | — | — | — | — | — | $1 |
| Common Stock Dividends Per Share Declared | $0.1 | $0.1 | — | $0.1 | $0.1 | $0.1 | — | $0.1 |
| Common Stock Dividends Per Share | $0.1 | $0.1 | — | $0.1 | $0.1 | $0.1 | — | $0.1 |
| Dividends per share declared | $0.1 | $0.1 | — | $0.1 | $0.1 | $0.1 | — | $0.1 |
| Dividends per share declared | $0.1 | $0.1 | — | $0.1 | $0.1 | $0.1 | — | $0.1 |
| Common Stock Dividends Per Share Declared | $0.1 | $0.1 | — | $0.1 | $0.1 | $0.1 | — | $0.1 |
| Dividends declared (in dollars per share) | $0.1 | $0.1 | — | $0.1 | $0.1 | $0.1 | — | $0.1 |
| Common Stock Dividends Per Share Declared | $0.1 | $0.1 | — | $0.1 | $0.1 | $0.1 | — | $0.1 |
| Common Stock Dividends Per Share Declared | $0.1 | $0.1 | — | $0.1 | $0.1 | $0.1 | — | $0.1 |
| Defined Benefit Plan Recognized Net Gain Loss Due To Curtailments | $0 | $0 | — | $434K | $0 | $0 | — | $0 |
