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Additional Financial Information (Supplemental Cash Flow Information) (Details) - USD ($)
$ in Millions
 9 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Non-cash investing activities    
Accrued equity-method investment $ 19.0 $ 0.0
Decrease in finance lease right-of-use asset due to a reassessment event 0.0 (42.0)
Non-cash financing activities    
Decrease in finance lease liability due to a reassessment event 0.0 (48.6)
Right-of-use assets obtained in exchange for new lease obligations:    
Operating leases 54.3 14.2
Increase in right-of-use assets and lease liability due to a reassessment event(1):    
Operating leases - increase in right-of-use assets 0.0 6.0
Operating leases - increase in lease liability $ 0.0 $ 12.6