| **Shareholders' Equity (Details) - USD ($)**                            |               | 3 Months Ended | 6 Months Ended |        |               |
|-------------------------------------------------------------------------|---------------|----------------|----------------|--------|---------------|
||
| **Distribution Made to Limited Partner [Line Items]**                   |          |           |           |   |          |   |   |   |   |
| Future cash settlement accrual for executed repurchases of common stock |          | $ 2,000,000    |           | $ 0    |          | $ 2,000,000 | $ 0 |   |   |
| Repurchase aggregate cost                                               |          | 61,500,000     | $ 25,000,000.0 |   | $ 193,900,000 |   |   |   |   |
| 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 |   |
| 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     |           |           |   |          |   |   |   |   |
| Price per common stock (in dollars per share)                           | $ 193.94      |           |           |   |          |   |   |   |   |
| Repurchase aggregate cost                                               | $ 193,900,000 |           |           |   |          |   |   |   |   |
| 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             |          | $ 359,100,000  |           |   |          | $ 359,100,000 |   |   |   |
| Repurchase of common stock (in shares)                                  |          | 321,554        |           | 0      |          | 438,417 | 0 |   |   |
| Repurchase aggregate cost                                               |          | $ 61,500,000   |           | $ 0    |          | $ 86,500,000 | $ 0 |   |   |

| X                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Accrued Stock Repurchased, Cash Settlement
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No definition available.
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| X                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Stock Repurchased During Period, Price Per Share
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of stock repurchase plan authorized.
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| X                                                                                                                                                                                                                                                                                                              |
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| - Definition
Amount remaining of a stock repurchase plan authorized.
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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
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate 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
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