Revenues (Contract Assets and Liabilities) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Contract Assets (Non-current)	$ 1.2	$ 1.2	$ 1.2
Contract Liabilities (Current)	11.3	11.3	8.8
Contract liabilities	166.9	166.9	$ 144.7
Contract with Customer, Liability, Revenue Recognized	$ 3.3	$ 10.2