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Revenues, Remaining Performance Obligations (Details)
$ in Millions
Sep. 30, 2021
USD ($)
Remaining Performance Obligation to be Recognized in the Future [Abstract]  
Remaining performance obligation $ 24,039.2
Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01  
Remaining Performance Obligation to be Recognized in the Future [Abstract]  
Remaining performance obligation $ 1,003.5
Expected timing of satisfaction, period 3 months
Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01  
Remaining Performance Obligation to be Recognized in the Future [Abstract]  
Remaining performance obligation $ 3,589.2
Expected timing of satisfaction, period 1 year
Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01  
Remaining Performance Obligation to be Recognized in the Future [Abstract]  
Remaining performance obligation $ 3,025.5
Expected timing of satisfaction, period 1 year
Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01  
Remaining Performance Obligation to be Recognized in the Future [Abstract]  
Remaining performance obligation $ 2,830.8
Expected timing of satisfaction, period 1 year
Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01  
Remaining Performance Obligation to be Recognized in the Future [Abstract]  
Remaining performance obligation $ 2,476.9
Expected timing of satisfaction, period 1 year
Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01  
Remaining Performance Obligation to be Recognized in the Future [Abstract]  
Remaining performance obligation $ 11,113.3
Expected timing of satisfaction, period