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Capital Stock and Equity Compensation (Additional Information) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock award program, measurement period (years) | 3 years |  |
Expected dividend yield (percentage) | 0.00% |  |
Compensation expense | $ 5.8 | $ 5.0 | $ 4.4
Nonvested awards, total compensation cost not yet recognized | $ 7.6 |  |
Weighted-average remaining contractual life in years, options outstanding | 9 months 18 days |  |
Performance Shares | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock award program, awarded shares as a percentage of the original award amount (percent) | 0.00% |  |
Performance Shares | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock award program, awarded shares as a percentage of the original award amount (percent) | 200.00% |  |
Time Based Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | $ 6.0 | 5.8 | 5.6
Nonvested awards, total compensation cost not yet recognized | $ 7.5 |  |
Weighted-average remaining contractual life in years, options outstanding | 10 months 24 days |  |
Deferred Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | $ 1.1 | $ 1.1 | $ 0.9
Anniversary period from grant date | 13 months |  |
Conversion ratio | 1 |  |

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