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Additional Financial Information (Cash, Cash Equivalents and Restricted Cash) (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Additional Financial Information [Abstract]        
Cash and cash equivalents $ 378.5 $ 371.2    
Restricted cash included in other current assets 15.4 13.4    
Restricted cash included in other non-current assets 12.0 0.0    
Total cash, cash equivalents and restricted cash $ 405.9 $ 384.6 $ 267.4 $ 528.7