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Revenue - Schedule of Accounts Receivable, Provision for Doubtful Accounts (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Sep. 30, 2024
Mar. 31, 2024
Disaggregation of Revenue [Line Items]    
Trade accounts receivable (Opening) $ 6.4 $ 8.7
Beginning balance 6.4  
(Benefit) provision for doubtful accounts (1.1) (0.3)
Other   1.3
Other 2.5  
Uncollectible accounts written-off (1.0) (3.3)
Trade accounts receivable (Closing)   6.4
Ending balance $ 6.8 $ 6.4