Revenue Recognition Contract Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
Revenue Recognition [Abstract]
Receivables from contracts with customers, net	$ 571.2	$ 571.2	$ 706.7
Contract Asset (Current)	25.6	25.6	28.2
Contract Asset (Long-Term)	10.1	10.1	17.4
Contract Liability (Current)	32.3	32.3	31.6
Contract Liability (Long-Term)	58.1	58.1	$ 61.9
Revenue recognized in period from amounts included in contract liability at the beginning of the period	7.4	28.9
Revenue recognized in period from performance obligations satisfied in previous periods	$ 2.0	8.8
Contract assets reclassified to receivables		$ 27.5