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Revenue From Contracts With Customers - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Jan. 01, 2018
Disaggregation of Revenue [Line Items]    
Extended payment terms granted, minimum period to adjust contract consideration for the time value of money 1 year  
Contract assets $ 0.9  
Contract liabilities 20.3 $ 21.4
Revenue recognized 8.6  
Deferred contract costs 84.2  
Amortization of deferred contract costs 8.9  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-01-01    
Disaggregation of Revenue [Line Items]    
Unsatisfied performance obligations 426.0  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01    
Disaggregation of Revenue [Line Items]    
Unsatisfied performance obligations 444.0  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01    
Disaggregation of Revenue [Line Items]    
Unsatisfied performance obligations 676.3  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)    
Disaggregation of Revenue [Line Items]    
Unsatisfied performance obligations $ 1,500.0