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Additional Financial Information (Cash, Cash Equivalents and Restricted Cash) (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Additional Financial Information [Abstract]        
Cash and cash equivalents $ 322.7 $ 272.1    
Restricted cash included in other current assets 51.7 27.9    
Restricted cash included in other non-current assets 19.7 13.0    
Total cash, cash equivalents and restricted cash $ 394.1 $ 313.0 $ 405.9 $ 384.6