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Revenue - Estimated Minimum Revenue Expected to be Recognized in Future Related to Unsatisfied Performance Obligations (Details) - Fixed Price Contract [Member]
$ in Millions
Jun. 30, 2021
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-07-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Fixed consideration to be recognized $ 252.6
Remaining duration of contracts 6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Fixed consideration to be recognized $ 431.8
Remaining duration of contracts 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01  
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Fixed consideration to be recognized $ 2,604.4
Remaining duration of contracts