Investment in and Advances to Unconsolidated Affiliates Affiliate Income Statement (Details) - Miami Valley Gaming and Racing [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Investments in and Advances to Affiliates [Line Items]
Equity Method Investment-Casino Revenue	$ 40.2	$ 36.6	$ 79.5	$ 72.6
Equity Method Investment-Non-Casino Revenue	1.8	2.0	3.9	4.0
Net revenue	42.0	38.6	83.4	76.6
Equity Method Investment-Expenses	29.0	26.5	57.6	53.3
Equity Method, Depreciation & Amortization	3.2	3.3	6.3	6.5
Equity Method Investment Operating Income Loss	9.8	8.8	19.5	16.8
Interest and other expense, net	(0.6)	(0.9)	(1.3)	(1.8)
Net income	$ 9.2	$ 7.9	$ 18.2	$ 15.0