Revenue Recognition Contract Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Revenue Recognition [Abstract]
Receivables from contracts with customers, net	$ 493.4		$ 493.4		$ 662.0
Contract Asset (Current)	21.7		21.7		26.7
Contract Asset (Long-Term)	2.3		2.3		7.0
Contract Liability (Current)	32.3		32.3		32.6
Contract Liability (Long-Term)	55.5		55.5		$ 57.7
Revenue recognized in period from amounts included in contract liability at the beginning of the period	10.3	$ 8.5	18.8	$ 21.5
Revenue recognized in period from performance obligations satisfied in previous periods	$ 3.9	$ 2.3	3.9	6.9
Contract assets reclassified to receivables			$ 24.4	$ 27.0