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Capital Stock - Additional Information (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 06, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 31, 2018
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Total cost of shares repurchased |  | $ 24,600,000 | $ 143,000,000.0 | $ 357,700,000 |
Dividends per share of common stock |  | $ 0.17 | $ 0.64 | $ 0.55 |
Dividends paid |  | $ 14,200,000 | $ 54,200,000 | $ 48,400,000 |
Dividend Declared |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Dividends payable, date declared | Apr. 06, 2020 |  |  |  |
Number of preferred share purchase right declared as divided per common stock | 1 |  |  |  |
Dividends payable,record date | Apr. 06, 2020 |  |  |  |
Maximum percentage of common stock acquisition allowed by board of directors under rights plan | 15.00% |  |  |  |
Number of days after public announcement rights exercisable for acquiring person | 10 days |  |  |  |
Rights expiration date | Apr. 06, 2021 |  |  |  |
Dividend Declared | Series A Junior Participating Preferred Stock |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Exercise price of rights | $ 150.00 |  |  |  |
2018 Repurchase Plan |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Authorized amount to repurchase outstanding common stock |  |  |  |  | $ 500,000,000
Remaining authorized amount to repurchase outstanding common stock |  | $ 217,200,000 |  |  |

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