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Significant Accounting Policies - Summary of Future Performance Obligations (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Accounting Policies [Abstract]  
Expected gross operating margin expected to be recognized in future periods $ 1,019.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01  
Accounting Policies [Abstract]  
Expected gross operating margin expected to be recognized in future periods $ 196.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected gross operating margin expected to be recognized, period 9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Accounting Policies [Abstract]  
Expected gross operating margin expected to be recognized in future periods $ 252.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected gross operating margin expected to be recognized, period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01  
Accounting Policies [Abstract]  
Expected gross operating margin expected to be recognized in future periods $ 104.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected gross operating margin expected to be recognized, period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01  
Accounting Policies [Abstract]  
Expected gross operating margin expected to be recognized in future periods $ 94.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected gross operating margin expected to be recognized, period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01  
Accounting Policies [Abstract]  
Expected gross operating margin expected to be recognized in future periods $ 91.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected gross operating margin expected to be recognized, period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01  
Accounting Policies [Abstract]  
Expected gross operating margin expected to be recognized in future periods $ 279.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Expected gross operating margin expected to be recognized, period