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Shareholders' Equity (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 01, 2021 | Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 29, 2021 | Oct. 30, 2018
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |
Repurchase aggregate cost |  | $ 50,000,000.0 | $ 193,900,000 |  | $ 27,900,000 |  |  |  |
Future cash settlement accrual for executed repurchases of common stock |  | $ 1,500,000 |  | $ 0 |  | $ 1,500,000 | $ 0 |  |
October 2018 Stock Repurchase Program |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |
Authorized stock repurchase amount |  |  |  |  |  |  |  |  | $ 300,000,000
Remaining unused authorization for stock repurchase program |  |  |  |  |  |  |  | $ 97,900,000 |
Repurchase of common stock (in shares) |  | 245,132 |  | 0 |  | 245,132 | 235,590 |  |
Repurchase aggregate cost |  | $ 49,200,000 |  |  |  | $ 49,200,000 | $ 27,900,000 |  |
Stock Repurchase Agreement with The Duchossois Group, Inc Affiliate |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |
Repurchase of common stock (in shares) | 1,000,000 |  |  |  |  |  |  |  |
Repurchase aggregate cost | $ 193,900,000 |  |  |  |  |  |  |  |
Price per common stock (in dollars per share) | $ 193.94 |  |  |  |  |  |  |  |
2021 Stock Repurchase Program |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |
Authorized stock repurchase amount |  |  |  |  |  |  |  | $ 500,000,000 |
Remaining unused authorization for stock repurchase program |  | $ 499,200,000 |  |  |  | $ 499,200,000 |  |  |
Repurchase of common stock (in shares) |  | 3,178 |  |  |  | 3,178 |  |  |
Repurchase aggregate cost |  | $ 800,000 |  |  |  | $ 800,000 |  |  |

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