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Additional Financial Information (Cash, Cash Equivalents and Restricted Cash) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Additional Financial Information [Abstract]        
Cash and cash equivalents $ 425.4 $ 371.2    
Restricted cash included in other current assets 30.4 13.4    
Restricted cash included in other non-current assets 15.2 0.0    
Total cash, cash equivalents and restricted cash $ 471.0 $ 384.6 $ 319.3 $ 528.7