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Capital Stock - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | May 31, 2018
Equity Class Of Treasury Stock [Line Items] |  |  |  |
Total cost of shares repurchased | $ 143,000,000.0 | $ 357,700,000 | $ 150,300,000 |
Dividends per share of common stock | $ 0.64 | $ 0.55 | $ 0.47 |
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 | $ 241,800,000 |  |  |

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