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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 15, 2018 | Aug. 30, 2018 | May 15, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Feb. 25, 2016
Common stock dividends paid |  |  |  |  |  | $ 193,400,000 | $ 178,200,000 |  |
Dividends declared per common share |  |  |  | $ 0.79 | $ 0.63 | $ 2.21 | $ 1.89 |  |
Dividends declared date |  |  |  |  |  | Aug. 30, 2018 |  |  |
Dividends paid per common share (in dollars per share) |  | $ 0.79 |  |  |  |  |  |  |
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 |  | $ 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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