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Stockholders' Equity (Details) - USD ($) | 11 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2018 | Feb. 12, 2017 | Aug. 20, 2014
Stockholders' Equity Note [Abstract] |  |  |  |
Authorized repurchase amount |  |  | $ 500,000,000 |
Total shares acquired (in shares) | 3,627,390 |  |  |
Total shares acquired | $ 221,428,000 |  |  |
Average cost of shares acquired (in dollars per share) | $ 61.01 |  |  |
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |  | $ 0.01
Maximum price of common stock available to be issued |  |  |  | $ 500,000,000

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