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Related-Party Transactions (Details) - Affiliated Entity - Services Performed Under Subcontractor
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2021
USD ($)
director
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
director
Sep. 30, 2020
USD ($)
Related Party Transaction [Line Items]        
Number of directors | director 2   2  
Payments to related party | $ $ 17.3 $ 21.7 $ 35.1 $ 45.0