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Subsequent Event (Details) $ / shares in Units, $ in Millions |  | 8 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 30, 2018 USD ($) $ / shares | Jun. 30, 2019 USD ($) | Oct. 31, 2018 | Sep. 30, 2018 USD ($) | Nov. 29, 2017 USD ($) | Apr. 25, 2017 USD ($)
Subsequent Event [Line Items] |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  | $ 500.0 | $ 250.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  | $ 78.3 |  |
Subsequent Event [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Dividends Payable, Amount Per Share | $ / shares | $ 1.63 |  |  |  |  |
Dividends Payable, Date to be Paid | Jan. 04, 2019 |  |  |  |  |
Dividends Payable, Date Declared | Dec. 07, 2018 |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | 3 |  |  |  |  |
Stock Repurchase Program, Authorized Amount | $ 300.0 |  |  |  |  |
Scenario, Forecast [Member] | Presque Isle Downs & Casino And Lady Luck Casino [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.10% |  |  |
Payments to Acquire Businesses, Gross |  | $ 326.0 |  |  |  |

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