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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 15, 2019 | Dec. 04, 2018 | Jul. 13, 2018 | May 15, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 25, 2016
Common stock dividends paid |  |  |  |  | $ 268,100,000 | $ 237,600,000 | $ 216,100,000 |
Dividends paid per common share (in dollars per share) |  | $ 0.79 | $ 0.79 |  |  |  |  |
Dividends declared per common share |  |  |  |  | $ 3.00 | $ 2.52 | $ 2.36 |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  | $ 200,000,000
Repurchases of common stock under stock repurchase program |  |  |  |  | 0 | 0 |  |
Common stock repurchase authorization amount available |  |  |  |  | $ 193,000,000 |  |  |
Annual Dividend [Member] |  |  |  |  |  |  |  |
Dividends declared per common share |  |  |  | $ 3.16 |  | $ 2.52 |  |
Subsequent Event |  |  |  |  |  |  |  |
Common stock dividends paid | $ 74,700,000 |  |  |  |  |  |  |

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