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Share-Based Compensation Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Share-based compensation | $ 24.2 | $ 26.3 | $ 27.8 |
Consideration received from share-based awards | 7.4 | 7.0 | 5.2 |
Income tax benefit recognized related to share-based compensation | $ 1.7 | $ 1.8 | $ 4.5 |
Number of shares granted | 156,000 | 174,000 | 122,000 |
Number of shares outstanding | 788,000 | 723,000 | 672,000 | 574,000
Maximum |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Performance period range | 3 years |  |  |
Stock option |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Share-based compensation | $ 3.3 | $ 4.0 | $ 4.0 |
Share-based payment award vesting period | 4 years |  |  |
Expiration period | 10 years |  |  |
Fair value of options vested | $ 2.3 | $ 2.3 | $ 3.1 |
Total unrecognized compensation cost, net of estimated forfeitures | $ 2.0 |  |  |
Total unrecognized compensation cost, weighted-average period for recognition | 1 year |  |  |
Weighted average of daily historical volatility of Company's stock price, weight (as a percent) | 75.00% |  |  |
Period considered to determine expected volatility of stock price | 5 years |  |  |
Implied volatility based on exchange traded options for Company's common stock, weight (as a percent) | 25.00% |  |  |
Weighted-average grant-date fair value of options granted (in dollars per share) | $ 18.95 | $ 17.78 | $ 31.46 |
Stock option | Minimum |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Purchase price (as a percent) | 100.00% |  |  |
Stock Appreciation Rights |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Number of shares granted | 0 | 0 |  |
Number of shares outstanding | 0 | 0 |  |
Deferred Stock |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Share-based compensation | $ 1.3 | $ 1.4 | $ 1.9 |
Deferred Stock | In Lieu of Annual Cash Retainer |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Granted (in shares) | 1,432 | 1,275 | 5,551 |
Deferred Stock | Additional Compensation for Board Service |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Share-based payment award vesting period | 1 year |  |  |
Expiration period | 3 years |  |  |
Granted (in shares) | 11,004 | 18,172 | 10,152 |
Restricted Stock |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Share-based compensation | $ 15.7 | $ 15.5 | $ 13.3 |
Total unrecognized compensation cost, net of estimated forfeitures | $ 17.2 |  |  |
Total unrecognized compensation cost, weighted-average period for recognition | 2 years |  |  |
Granted (in shares) | 200,000 | 236,000 | 145,000 |
Forfeited (in shares) | 17,000 | 36,000 | 23,000 |
Term for restrictions to lapse | 6 years |  |  |
Restricted Stock | Additional Compensation for Board Service |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Granted (in shares) | 7,208 | 7,407 | 6,345 |
Forfeited (in shares) | 1,666 |  |  |
Performance Shares |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Share-based compensation | $ 3.7 | $ 5.2 | $ 8.4 |

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