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Shareholders' Equity - Additional Information (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 09, 2017 | Feb. 12, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 30, 2018 | Oct. 29, 2018 | Nov. 29, 2017 | Apr. 25, 2017 | Feb. 29, 2016 | Feb. 24, 2016 | Dec. 31, 2015
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Authorized stock repurchase amount |  |  |  |  |  |  |  |  | $ 250,000,000.0 | $ 150,000,000.0 | $ 150,000,000.0 | $ 150,000,000.0
Remaining unused authorization for stock repurchase program |  |  |  |  | $ 122,400,000 |  | $ 78,300,000 |  |  | $ 114,600,000 |  | $ 11,900,000
Stock repurchased during period (in shares) |  |  |  |  | 635,370 |  |  |  |  |  |  |
Stock repurchased and retired during period, value |  |  |  |  | $ 27,600,000 |  |  |  |  |  |  |
Repurchase aggregate cost |  |  | $ 549,500,000 | $ 190,900,000 | $ 39,000,000 |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  | 150,000,000 | 150,000,000 |  | 150,000,000 | 50,000,000 |  |  |  |  |
The Duchossois Group |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) | 3,000,000 |  |  | 3,000,000 |  |  |  |  |  |  |  |
Stock repurchased and retired during period, value | $ 158,800,000 |  |  |  |  |  |  |  |  |  |  |
Repurchase price (in dollars per share) | $ 52.93 |  |  |  |  |  |  |  |  |  |  |
April 2017 Stock Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Remaining unused authorization for stock repurchase program |  |  |  | $ 78,300,000 |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  |  | 3,231,087 |  |  |  |  |  |  |  |
Stock repurchased and retired during period, value |  |  |  | $ 171,700,000 |  |  |  |  |  |  |  |
Tender Offer |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Authorized stock repurchase amount |  |  |  |  |  |  |  | $ 500,000,000.0 |  |  |  |
Stock repurchased during period (in shares) |  | 5,660,376 |  |  |  |  |  |  |  |  |  |
Repurchase price (in dollars per share) |  | $ 88.33 |  |  |  |  |  |  |  |  |  |
Repurchase aggregate cost |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |
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 |  |  | $ 268,000,000 |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  | 372,282 |  |  |  |  |  |  |  |  |
Repurchase aggregate cost |  |  | $ 32,000,000 |  |  |  |  |  |  |  |  |

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