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Shareholders' Equity (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Oct. 30, 2018 | Oct. 29, 2018 | 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 |  | $ 27,900,000 | $ 18,000,000.0 | $ 25,000,000.0 |  |  |  |
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 | $ 147,100,000 |  |  |  | $ 147,100,000 |  |  |
Repurchase of common stock (in shares) | 0 |  |  |  | 235,590 |  |  |
Repurchase aggregate cost |  |  |  |  | $ 27,900,000 |  |  |

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