Investment in and Advances to Unconsolidated Affiliates Affiliate Income Statement (Details) - Miami Valley Gaming and Racing [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Investments in and Advances to Affiliates [Line Items]
Equity Method Investment-Casino Revenue	$ 38.4	$ 36.1	$ 117.9	$ 108.7
Equity Method Investment-Non-Casino Revenue	1.2	1.2	5.1	5.2
Net revenue	39.6	37.3	123.0	113.9
Equity Method Investment-Expenses	28.1	26.4	85.7	79.7
Equity Method, Depreciation & Amortization	3.2	3.4	9.5	9.9
Equity Method Investment Operating Income Loss	8.3	7.5	27.8	24.3
Interest and other expense, net	(0.6)	(0.8)	(1.9)	(2.6)
Net income	$ 7.7	$ 6.7	$ 25.9	$ 21.7