Segment Information - Schedule of Total Assets and Capital Expenditures by Operating Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 1,725.2	$ 2,359.4
Capital expenditures	149.4	116.9	$ 54.7
Racing
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	498.9	483.0
Capital expenditures	59.9	57.8	26.1
Online Wagering
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	222.8	215.9
Capital expenditures	9.7	9.0	7.0
Casino
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	774.1	679.6
Capital expenditures	15.9	37.5	13.9
Other Investments
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	78.9	15.2
Capital expenditures	61.7	3.4	1.0
Corporate
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	150.5	73.2
Capital expenditures	2.2	1.3	1.2
Discontinued Operations, Held-for-sale | Big Fish Games
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	0.0	892.5
Capital expenditures	$ 0.0	$ 7.9	$ 5.5