Revenue Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Contract with Customer, Asset, after Allowance for Credit Loss	$ 45.0	$ 9.4
Contract with Customer, Liability	48.8	69.1
Contract with Customer, Liability, Revenue Recognized	44.2
Contract with Customer, Liability, Noncurrent	12.0	$ 12.5
Revenue, Remaining Performance Obligation, Amount	$ 313.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year