Revenue Recognition Contract Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Revenue Recognition [Abstract]
Receivables from contracts with customers, net	$ 477.2		$ 477.2		$ 662.0
Contract Asset (Current)	26.1		26.1		26.7
Contract Asset (Long-Term)	6.8		6.8		7.0
Contract Liability (Current)	32.1		32.1		32.6
Contract Liability (Long-Term)	55.4		55.4		$ 57.7
Revenue recognized in period from amounts included in contract liability at the beginning of the period	5.9	$ 7.4	24.7	$ 28.9
Revenue recognized in period from performance obligations satisfied in previous periods	$ 9.9	$ 2.0	13.8	8.8
Contract assets reclassified to receivables			$ 24.4	$ 27.5