Equity Method Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Equity Method Investments [Abstract]
Equity interest in the net income of equity method investments	$ 5.4	$ 8.4	$ 16.2
Equity interest in the net assets of equity method investments	$ 38.6	$ 45.3