Equity Method Investments (Income Statement) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Equity Method Investments and Joint Ventures [Abstract]
Total revenues	$ 99.8	$ 104.2	$ 222.7	$ 248.2
Gross loss	(3.7)	(0.5)	(6.4)	(0.8)
Operating and non-operating expense	4.6	4.3	10.4	10.0
Net loss	$ (8.3)	$ (4.8)	$ (16.8)	$ (10.8)