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Stock Incentive Plan (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 20, 2022 | Dec. 31, 2021 | Apr. 22, 2021 | Feb. 25, 2022 | Jan. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Common stock, shares issuable (in shares) |  | 150,000,000 |  |  |  | 150,000,000 | 150,000,000 |
Shares available for grant (in shares) |  | 4,000,968 |  |  |  | 4,000,968 |  |
Compensation cost related to unearned performance awards |  | $ 20.6 |  |  |  | $ 20.6 |  |
Stock compensation expense |  |  |  |  |  | 27.6 | $ 37.9 | $ 41.7
Excess tax benefit of stock awards |  |  |  |  |  | $ 3.3 | $ 2.5 | $ 2.7
Certain retirees and other individuals |  |  |  |  |  |  |  |
Shares earned (in shares) |  | 59,182 |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  | 330,174 |  |  |  |
Shares withheld for taxes (in shares) |  |  |  | 125,363 |  |  |  |
Performance Shares |  |  |  |  |  |  |  |
Shares awarded (in shares) |  |  |  |  |  | 281,310 |  |
Shares earned (in share) |  | 330,174 |  |  |  | 330,174 |  |
Shares earned (in shares) |  |  |  |  |  | 309,198 |  |
Recognition period |  | 1 year 6 months |  |  |  |  |  |
Weighted average grant-date fair value (in dollars per share) |  |  |  |  |  | $ 123.33 | $ 70.84 | $ 61.01
Number of shares not vested (in shares) |  | 514,714 |  |  |  | 514,714 | 582,952 |
Performance Shares | Certain retirees and other individuals |  |  |  |  |  |  |  |
Shares earned (in share) |  |  |  |  |  |  | 97,818 |
Performance Shares | Subsequent event |  |  |  |  |  |  |  |
Shares awarded (in shares) | 137,283 |  |  |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |
Performance period |  |  |  |  |  | 3 years |  |
Shares awarded (in shares) |  |  |  |  |  | 92,848 |  |
Shares earned (in shares) |  |  |  |  |  | 67,110 |  |
Compensation cost related to unearned performance awards |  | $ 8.5 |  |  |  | $ 8.5 |  |
Recognition period |  | 1 year 6 months |  |  |  |  |  |
Award vesting rights, share conversion ratio |  |  |  |  |  | 1 |  |
Weighted average grant-date fair value (in dollars per share) |  |  |  |  |  | $ 113.91 | $ 70.83 | 61.01
Number of shares not vested (in shares) |  | 159,228 |  |  |  | 159,228 | 143,287 |
Restricted Stock Units (RSUs) | Certain Retirees |  |  |  |  |  |  |  |
Shares earned (in shares) |  |  |  |  |  | 3,830 |  |
Restricted Stock Units (RSUs) | Certain Executives | 2020 Grants |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 3 years |  |
Restricted Stock Units (RSUs) | Tranche one |  |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  |  | 33.33% |  |
Restricted Stock Units (RSUs) | Tranche two |  |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  |  | 33.33% |  |
Restricted Stock Units (RSUs) | Tranche three |  |  |  |  |  |  |  |
Award vesting percentage |  |  |  |  |  | 33.33% |  |
Restricted Stock Units (RSUs) | Subsequent event |  |  |  |  |  |  |  |
Shares awarded (in shares) | 91,583 |  |  |  |  |  |  |
Issuance of stock awards (in shares) |  |  |  |  | 44,991 |  |  |
Shares withheld for taxes (in shares) |  |  |  |  | 23,726 |  |  |
Stock Appreciation Rights (SSARs) |  |  |  |  |  |  |  |
Compensation cost related to unearned performance awards |  | $ 0.8 |  |  |  | $ 0.8 |  |
Recognition period |  | 1 year 6 months |  |  |  |  |  |
Weighted average grant-date fair value (in dollars per share) |  |  |  |  |  |  | $ 12.31 | $ 11.34
SSAR expiration period |  |  |  |  |  | 7 years |  |
Vesting period |  |  |  |  |  | 4 years |  |
Stock compensation expense |  |  |  |  |  | $ 0.8 | $ 1.9 | $ 2.4
Weighted average remaining contractual life of SSARs outstanding |  |  |  |  |  | 4 years |  |
Total fair value of SSARs vested |  |  |  |  |  | $ 1.5 |  |
Number of shares not vested (in shares) |  | 120,675 |  |  |  | 120,675 |  |
Total intrinsic value of outstanding SSARs |  | $ 9.3 |  |  |  | $ 9.3 |  |
Total intrinsic value of exercisable of SSARs |  | $ 3.7 |  |  |  | 3.7 |  |
Total intrinsic value of SSARs exercised |  |  |  |  |  | 13.6 |  |
Restricted Stock |  |  |  |  |  |  |  |
Stock compensation expense |  |  |  |  |  | $ 1.4 |  |
Weighted-average period for compensation cost expected to be recognized |  |  |  |  |  | 1 year |  |
Restricted common stocks issued (in shares) |  |  | 9,117 |  |  |  |  |
Restricted common stocks issued after shares withheld for taxes (in shares) |  |  | 7,899 |  |  |  |  |
Minimum | Long Term Incentive Plan |  |  |  |  |  |  |  |
Target award percentages |  |  |  |  |  | 33.00% |  |
Maximum | Long Term Incentive Plan |  |  |  |  |  |  |  |
Target award percentages |  |  |  |  |  | 200.00% |  |
2006 Plan |  |  |  |  |  |  |  |
Common stock, shares issuable (in shares) |  | 10,000,000 |  |  |  | 10,000,000 |  |
Long Term Incentive Plan |  |  |  |  |  |  |  |
Performance period |  |  |  |  |  | 3 years |  |

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