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Segment Information - Equity in Earnings of Unconsolidated Investments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Equity in income of unconsolidated investments $ 9.1 $ 8.9 $ 24.4 $ 22.7
Casino Segment [Member]        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Equity in income of unconsolidated investments 9.0 8.7 24.3 22.5
Other Investments Segment [Member]        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Equity in income of unconsolidated investments $ 0.1 $ 0.2 $ 0.1 $ 0.2