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Leases (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Leases [Abstract]      
Operating lease costs $ 17.3 $ 15.0 $ 14.1
Undiscounted future payments $ 26.7    
Lease term of lease not yet commenced 20 years