Revenue Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Jan. 01, 2018
Revenue from Contract with Customer [Abstract]
Contract with Customer, Asset, Net	$ 10.5	$ 14.1
Contract with Customer, Liability	66.4	60.1
Contract with Customer, Liability, Revenue Recognized	42.2
Contract with Customer, Liability, Noncurrent	14.0	$ 13.8
Revenue, Remaining Performance Obligation, Amount	$ 154.4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Remaining performance obligation, expected timing of satisfaction, percent	85.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year