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Noncontrolling Interests - Schedule of Redeemable Noncontrolling Interest (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Increase (Decrease) in Temporary Equity [Roll Forward]          
Beginning balance $ 123.3 $ 343.6 $ 343.6 $ 321.2 $ 219.1
Beginning balance 123.3 343.6 343.6    
Net loss attributable to redeemable noncontrolling interests     (14.9) (9.2) (17.7)
Net loss attributable to redeemable noncontrolling interests (1.6) (7.3)      
Noncontrolling interests discount accretion     0.0 13.2 22.7
Adjustments to redemption value     83.4 78.4 98.6
Adjustments to redemption value 0.9 71.5      
Other     (93.2) 1.7 0.0
Cash distributions     (1.0) (6.6) (1.5)
Cash contributions (distributions) 0.5 (1.0)      
Purchase of noncontrolling interest (23.4) (0.6) (194.6) (55.1) 0.0
Ending balance     123.3 343.6 $ 321.2
Ending balance $ 99.7 $ 406.2 $ 123.3 $ 343.6