| Proceeds From Issuance Of Unsecured Debt | $185M | $250M | $200M | $605M | $710M | $875M | $935M | $1.5B |
| Repayments of Unsecured Debt | $185M | $150M | $200M | $355M | $1.1B | $805M | $915M | $1.1B |
| Change in Inventories | — | $82.5M | — | $355.5M | — | $162.5M | — | $499.5M |
| Increase (Decrease) in Inventories | — | $82.5M | — | $355.5M | — | $162.5M | — | $499.5M |
| Accounts payable | — | — | — | $311.8M | — | $30.1M | — | $369.6M |
| Increase in operating lease liabilities resulting from new or modified right-of-use assets | $133.4M | $169.9M | — | $185.6M | $253.6M | $189.9M | — | $203M |
| Capital Expenditures | $192.6M | $188.2M | $246M | $141.3M | $210.4M | $277.6M | $265.6M | $202.6M |
| Payments to Acquire Property, Plant, and Equipment | $192.6M | $188.2M | $246M | $141.3M | $210.4M | $277.6M | $265.6M | $202.6M |
| Cash Provided by (Used in) Investing Activity, Including Discontinued Operation | -$179.1M | -$128.8M | -$183.8M | -$261.1M | -$187.6M | -$228.2M | -$101.7M | -$171.3M |
| Comprehensive Income (Loss), Net of Tax, Attributable to Parent | $423.8M | $239.3M | — | $178.2M | $430M | $259.3M | — | $164.5M |
| Net Income (Loss) Attributable to Parent, Diluted | — | $241.5M | — | $179.4M | — | — | — | $164.5M |
| Other Comprehensive Income (Loss) | $423.8M | $239.3M | — | $178.2M | $430M | $259.3M | — | $164.5M |
| Construction in progress additions | $0 | $13.9M | $7M | $84.7M | $46.1M | — | — | $154.8M |
| Payments of Dividends | $118.5M | $117.8M | $117.3M | $122.4M | $122M | $121.9M | $121.4M | $126.4M |
| Cash Dividends Paid | $118.5M | $117.8M | — | $122.4M | $122M | $121.9M | — | $126.4M |
| Purchase price | $140.5M | $151.3M | — | $93.8M | $72.8M | $75.9M | — | $118.8M |
| Treasury stock, value, acquired | $140.5M | $151.3M | — | $93.8M | $72.8M | $75.9M | — | $118.8M |
| Stock Repurchased During Period, Value | $140.5M | $151.3M | — | $93.8M | $72.8M | $75.9M | — | $118.8M |
| Payments for Repurchase of Common Stock | $140.5M | $151.3M | $154M | $95.1M | $72.8M | $74M | $117.3M | $118M |
| Cash Provided by (Used in) Financing Activity, Including Discontinued Operation | -$250.2M | -$165.9M | -$268.2M | $24.5M | -$604.1M | -$120.8M | -$213.7M | $110.4M |
| Accrued compensation and employee benefits | $47M | -$16.9M | $47.8M | -$83.7M | $54.8M | -$15.9M | $58.4M | -$93.9M |
| Cash Provided by (Used in) Operating Activity, Including Discontinued Operation | $559.9M | $86.3M | $517.2M | $216.8M | $785.8M | $307.9M | $324.8M | $91.1M |
| Dispositions of property, plant, and equipment | $13.5M | $59.4M | $62.2M | $20.9M | $22.1M | $49.3M | $163.8M | $31.3M |
| Net Change in Cash and Restricted Cash | — | -$208.5M | — | -$19.8M | -$5.9M | -$41.2M | — | $30.2M |
| Change in Income Taxes Payable | $55.5M | -$109.2M | — | $46.5M | $113.8M | — | — | $27.8M |
| Increase Decrease In Accrued Income Taxes Payable | $55.5M | -$109.2M | -$7.3M | $46.5M | $113.8M | -$102.5M | -$63.8M | $27.8M |
| Deferred taxes | -$19.8M | -$10.5M | -$1.4M | $1.7M | -$25.7M | $40.8M | $44.5M | $23.5M |
| Gain Loss On Sale Of Property Plant Equipment | $5.5M | $34.5M | $23.7M | $17.4M | $16M | $32.6M | $27M | $22.7M |
| Change in Prepaid Expenses and Other Assets | $37.7M | -$42.4M | — | $11.3M | $15.1M | — | — | $20M |
| Increase (Decrease) in Prepaid Expense and Other Assets | $37.7M | -$42.4M | -$2.4M | $11.3M | $15.1M | — | — | $20M |
| Share-based compensation expense related to employee stock plans | — | — | — | $13.2M | — | — | — | $17.6M |
| Stock-based compensation | $10.7M | $10M | $13.2M | $13.2M | $12.7M | $15.3M | $15.8M | $17.6M |
| Share-Based Payment Tax Withholding Decrease | — | — | — | $14M | — | — | — | $14.1M |
| Tax Withholding for Share-Based Payments | $716K | $901K | $323K | $14M | $522K | $1.2M | $181K | $14.1M |
| Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation | — | — | — | $14M | — | — | — | $14.1M |
| Payment, Tax Withholding, Share-Based Payment Arrangement | $716K | $901K | $323K | $14M | $522K | $1.2M | $181K | $14.1M |
| Accrued liabilities | $0 | -$20.2M | $21.1M | $2.6M | -$18.5M | $125.9M | — | -$11M |
| Issuance of Common Stock (Employee Equity Plans) | — | — | — | $7M | — | — | — | $9.6M |
| Shares Issued for Share-Based Compensation | $6.6M | $4.2M | — | $7M | $4.3M | $7.3M | — | $9.6M |
| Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options | $6.6M | $4.2M | $6.8M | $7M | $4.3M | $7.3M | $5M | $9.6M |
| Increase (Decrease) in Other Operating Assets and Liabilities, Net | -$5.9M | -$39.4M | — | -$9.4M | -$44.2M | -$7.9M | -$9.1M | -$8.6M |
| Income Taxes Paid, Net | $88.1M | $188.4M | $73.2M | $0 | $42.8M | $12.6M | — | $8.4M |
| Income Taxes Paid, Net | $88.1M | $188.4M | $73.2M | $0 | $42.8M | $12.6M | — | $8.4M |
| Decrease in finance lease liabilities resulting from new or modified right-of-use assets | $0 | $0 | — | -$3.4M | — | $4.4M | — | -$6.9M |
| Interest Paid, Net | $26.3M | $6.2M | $29.4M | $8.4M | $30.5M | $2.1M | $28.7M | $4.7M |
| Interest Paid, Excluding Capitalized Interest, Operating Activity | $26.3M | $6.2M | $29.4M | $8.4M | $30.5M | $2.1M | $28.7M | $4.7M |
| Shares Repurchased | 2.6B | 2.8B | — | 1.7M | 1.4M | 1.3M | — | 2.3M |
| Stock Repurchased During Period Shares | $2.6B | $2.8B | — | $1.7M | $1.4M | $1.3M | — | $2.3M |
| Stock options excluded as their inclusion would be anti-dilutive (in shares) | $1.1M | $700K | — | $400K | $1.3M | $600K | — | $1.9M |
| Add - Incremental shares under stock-based compensation plans (in shares) | $2.5M | $2.6M | — | $2.4M | $1.9M | $2.4M | — | $1.8M |
| State taxes | $10.5M | $10.5M | $10.5M | $1.7M | — | — | — | -$1.7M |
| Finance Lease Principal Paid | — | $453K | — | $1.1M | $988K | $992K | — | $717K |
| Finance Lease Principal Payments | $0 | $453K | $3.5M | $1.1M | $988K | $992K | $0 | $717K |
| Average price paid (in dollars per share) | $54.50 | $53.43 | — | $54.39 | $51.10 | $59.32 | — | $50.75 |
| Number of reportable segments | 1.00 | 1.00 | — | 1.00 | 1.00 | 1.00 | — | 1.00 |
| Number of reportable segments | $1 | $1 | — | $1 | $1 | $1 | — | $1 |
| Sales Revenue Net Percentage | — | — | — | 100.0% | — | — | — | 100.0% |
| Common Stock Dividends Per Share Declared | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 |
| Common Stock Dividends Per Share | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 |
| Dividends per share declared | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 |
| Dividends per share declared | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 |
| Common Stock Dividends Per Share Declared | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 |
| Dividends declared (in dollars per share) | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 |
| Common Stock Dividends Per Share Declared | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 |
| Common Stock Dividends Per Share Declared | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 | $0.2 |
| Effective tax rates | $0.2 | $0.2 | — | $0.2 | $0.2 | $0.2 | — | $0.2 |
| Debt Instrument, Basis Spread on Variable Rate LIBOR Plus, Maximum | — | — | — | 1.3% | — | — | — | 1.3% |
| Debt Instrument, Basis Spread on Variable Rate LIBOR Plus | — | — | — | 1.0% | — | — | — | 1.0% |
| Debt Instrument, Basis Spread on Variable Rate, Minimum | — | — | — | 0.8% | — | — | — | 0.8% |
| Debt Instrument, Basis Spread on Variable Rate Revolver | — | — | — | 0.1% | — | — | — | 0.1% |
| OCI - Cash flow hedge, net of tax | -$1.4M | -$2.1M | — | -$1.2M | $0 | $0 | — | $0 |
| Other comprehensive income (loss), net of tax | -$1.4M | -$2.1M | — | -$1.2M | $0 | $0 | — | $0 |
| Acquisitions, Net of Cash | $0 | $0 | — | $140.6M | — | — | — | $0 |
| OCI Cash Flow Hedge Gain (Loss) | -$1.4M | -$2.1M | — | -$1.2M | $0 | $0 | — | $0 |
| Unrealized Gains (Losses) on Hedge Instruments | -$1.4M | -$2.1M | — | -$1.2M | $0 | $0 | — | $0 |
| Other comprehensive income (loss), after-tax | -$1.4M | -$2.1M | — | -$1.2M | $0 | $0 | — | $0 |
| OCI - Cash Flow Hedges, Net of Tax | -$1.4M | -$2.1M | — | -$1.2M | $0 | $0 | — | $0 |
| Amount Of Dilutive Securities Stock Options And Restrictive Stock Units | $0 | $0 | — | $0 | $0 | $0 | — | $0 |
| Debt Instrument Basis Spread On Variable Rate1 | — | — | — | 0.0% | — | — | — | 0.0% |
| Dilutive stock options and restricted stock units outstanding , per share | $0.00 | $0.00 | — | $0.00 | $0.00 | $0.00 | — | $0.00 |
| Unrealized gains (losses) on hedge instruments | -$1.4M | -$2.1M | — | -$1.2M | $0 | $0 | — | $0 |
| Other comprehensive income (loss) | -$1.4M | -$2.1M | — | -$1.2M | $0 | $0 | — | $0 |
| Payments to Acquire Businesses, Net of Cash Acquired | $0 | $0 | $0 | $140.6M | — | — | — | $0 |
