Revenue Recognition Contract Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Revenue Recognition [Abstract]
Receivables from contracts with customers, net	$ 324.5		$ 662.0
Contract Asset (Current)	21.7		26.7
Contract Asset (Long-Term)	7.2		7.0
Contract Liability (Current)	32.8		32.6
Contract Liability (Long-Term)	57.3		$ 57.7
Revenue recognized in period from amounts included in contract liability at the beginning of the period	8.5	$ 13.0
Revenue recognized in period from performance obligations satisfied in previous periods	0.0	4.6
Contract assets reclassified to receivables	$ 14.5	$ 24.4