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Additional Financial Information (Cash, Cash Equivalents and Restricted Cash) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Additional Financial Information [Abstract]        
Cash and cash equivalents $ 261.6 $ 528.7    
Restricted cash included in other current assets 5.8 0.0    
Total cash, cash equivalents and restricted cash $ 267.4 $ 528.7 $ 376.1 $ 318.2