Segment Information - Schedule of Equity in Income (Losses) of Unconsolidated Investments Included in Reported Segments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting, Other Significant Reconciling Item [Line Items]
Equity in income of unconsolidated investments	$ 17.4	$ 11.2	$ 6.3
Casinos
Segment Reporting, Other Significant Reconciling Item [Line Items]
Equity in income of unconsolidated investments	17.4	10.9	8.9
TwinSpires
Segment Reporting, Other Significant Reconciling Item [Line Items]
Equity in income of unconsolidated investments	0.0	0.0	(0.1)
Other Investments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Equity in income of unconsolidated investments	$ 0.0	$ 0.3	$ (2.5)