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Additional Financial Information (Cash, Cash Equivalents and Restricted Cash) (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Mar. 31, 2021
Additional Financial Information [Abstract]        
Cash and cash equivalents $ 557.1 $ 371.2    
Restricted cash included in other current assets 26.0 13.4    
Restricted cash included in other non-current assets 16.3 0.0    
Total cash, cash equivalents and restricted cash $ 599.4 $ 384.6 $ 447.8 $ 528.7