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Revenue (Remaining Performance Obligations - Timing) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Revenue from Contract with Customer [Abstract]  
Remaining Performance Obligations $ 1,602.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01  
Revenue from Contract with Customer [Abstract]  
Remaining Performance Obligations $ 491.8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining Performance Obligations, performance period 3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01  
Revenue from Contract with Customer [Abstract]  
Remaining Performance Obligations $ 694.2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining Performance Obligations, performance period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01  
Revenue from Contract with Customer [Abstract]  
Remaining Performance Obligations $ 196.9
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining Performance Obligations, performance period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01  
Revenue from Contract with Customer [Abstract]  
Remaining Performance Obligations $ 219.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining Performance Obligations, performance period