Revenue Recognition Contract Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Contract Assets (Non-current)	$ 1.2	$ 1.2	$ 1.2
Contract Liabilities (Current)	10.2	10.2	8.8
Contract Liabilities (Non-current)	159.6	159.6	$ 144.7
Contract with Customer, Liability, Revenue Recognized	$ 3.1	$ 6.9