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Shareholders' Equity (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Feb. 01, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Oct. 30, 2018
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |
Repurchase aggregate cost |  |  | $ 193,900,000 |  | $ 27,900,000 |  |  |
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 |  | 0 |  | 0 | 235,590 |
Repurchase aggregate cost |  |  |  |  |  |  | $ 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 |  |  |  |  |  |  |

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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