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Related Party Transactions - Additional Information (Details) - The Duchossois Group - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Jun. 09, 2017 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |
Stock repurchased during period (in shares) | 3,000,000 | 3,000,000
Repurchase price (in dollars per share) | $ 52.93 |
Stock repurchased and retired during period, value | $ 158.8 |

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