Revenue Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Revenue from Contract with Customer [Abstract]
Amount of revenue recognized from performace obligations partially satisfied in previous periods	$ 23.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Accounts receivable, net	250.0	$ 250.0	$ 237.8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations that were unsatisfied or partially satisfied	$ 25.8	$ 25.8
Performance obligations that were unsatisfied or partially satisfied, expected timing of satisfaction		1 month