Investment in and Advances to Unconsolidated Affiliates Affiliate Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2012
Investments in and Advances to Affiliates [Line Items]
Other liabilities			$ 50.0
Miami Valley Gaming and Racing [Member]
Investments in and Advances to Affiliates [Line Items]
Current assets	$ 18.6	$ 18.7
Equity Method Investment-Property Plant & Equipment	107.3	109.8
Other assets, net	105.0	105.0
Total assets	230.9	233.5
Current liabilities	10.6	12.5
Equity Method Investment-Long-term Debt, Current Maturities	8.3	8.3
Other liabilities	12.3	14.0
Investment Affiliate-Other Liabilities	0.1	0.1
Members' equity	199.6	198.6
Total liabilities and members' equity	$ 230.9	$ 233.5