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Cash, Cash Equivalents and Restricted Cash (Schedule of Cash, Cash Equivalents and Restricted Cash) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Cash and Cash Equivalents [Line Items]          
Cash and cash equivalents $ 168.5 $ 193.8      
Restricted cash included in other current assets 0.2 0.2 $ 0.2    
Restricted cash included in other long-term assets 12.2 2.8 2.8    
Total cash, cash equivalents and restricted cash $ 180.9 $ 196.8 $ 196.8 $ 157.9 $ 169.2