Equity Method Investments (Income Statement) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]
Total revenues	$ 483.3	$ 473.0	$ 589.4
Gross (loss) profit	(21.1)	(12.8)	(13.2)
Operating and non-operating expense	21.9	22.3	22.2
Net loss	$ (43.0)	$ (35.1)	$ (35.4)