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Shareholders' Equity (Details) - USD ($) | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Feb. 12, 2018 | Dec. 31, 2018 | Oct. 30, 2018 | Oct. 29, 2018 | Nov. 29, 2017 | Apr. 25, 2017
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |
Authorized stock repurchase amount |  |  |  |  |  |  |  | $ 250,000,000.0
Remaining unused authorization for stock repurchase program |  |  |  |  |  | $ 78,300,000 |  |
Repurchase aggregate cost | $ 32,600,000 | $ 514,400,000 |  |  |  |  |  |
Repurchase of common stock included in accrued expenses | 1,000,000.0 | $ 0 |  |  |  |  |  |
October 2018 Stock Repurchase Program |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |
Authorized stock repurchase amount |  |  |  |  | $ 300,000,000.0 |  |  |
Remaining unused authorization for stock repurchase program | $ 243,000,000.0 |  |  |  |  |  |  |
Repurchase of common stock (in shares) | 282,416 |  |  |  |  |  |  |
Repurchase aggregate cost | $ 25,000,000.0 |  |  |  |  |  |  |
Repurchase of common stock included in accrued expenses | $ 1,000,000.0 |  |  | $ 2,500,000 |  |  |  |
Shares of common stock repurchase | 79,233 |  |  |  |  |  |  |
Shares of common stock repurchased | $ 7,600,000 |  |  |  |  |  |  |
Tender Offer |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |
Authorized stock repurchase amount |  |  |  |  |  |  | $ 500,000,000.0 |
Repurchase of common stock (in shares) |  |  | 5,660,376 |  |  |  |  |
Repurchase aggregate cost |  |  | $ 500,000,000.0 |  |  |  |  |
Repurchase price (in dollars per share) |  |  | $ 88.33 |  |  |  |  |

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