Business and Basis of Presentation - Revenue Remaining Performance Obligation (Details) $ in Millions	Jun. 30, 2018 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Revenue, remaining performance obligation	$ 2,200.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-04-01
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Revenue, remaining performance obligation	$ 777.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction period	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Revenue, remaining performance obligation	$ 1,082.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Revenue, remaining performance obligation	$ 384.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction period