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Additional Financial Information - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Cash and Cash Equivalents [Line Items]            
Cash and cash equivalents $ 167.2 $ 277.0   $ 210.9    
Restricted cash included in other current assets 36.6 43.7   27.5    
Restricted cash included in other non-current assets 12.8 13.7   13.0    
Total cash, cash equivalents and restricted cash $ 216.6 $ 334.4 $ 299.8 $ 251.4 $ 270.3 $ 361.3