Investment in and Advances to Unconsolidated Affiliates Affiliate Balance Sheet (Details) - Miami Valley Gaming and Racing [Member] - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Investments in and Advances to Affiliates [Line Items]
Current assets	$ 18.1	$ 18.7
Equity Method Investment-Property Plant & Equipment	105.4	109.8
Other assets, net	105.0	105.0
Total assets	228.5	233.5
Current liabilities	8.6	12.5
Equity Method Investment-Long-term Debt, Current Maturities	8.3	8.3
Other liabilities	10.6	14.0
Investment Affiliate-Other Liabilities	0.1	0.1
Members' equity	200.9	198.6
Total liabilities and members' equity	$ 228.5	$ 233.5