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Capital Stock - Additional Information (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | May 31, 2018 | Feb. 28, 2017
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Total cost of shares repurchased | $ 357,700,000 | $ 150,300,000 | $ 111,100,000 |  |
Dividends paid on common stock | 48,400,000 | $ 42,600,000 | $ 39,800,000 |  |
Dividends per share of common stock |  | $ 0.47 | $ 0.44 |  |
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 | 384,800,000 |  |  |  |
2017 Repurchase Plan |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Authorized amount to repurchase outstanding common stock |  |  |  |  | $ 300,000,000
Total cost of shares repurchased | $ 242,500,000 |  |  |  |

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