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Cash, Cash Equivalents and Restricted Cash (Schedule of Cash, Cash Equivalents and Restricted Cash) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Cash and Cash Equivalents [Line Items]          
Cash and cash equivalents $ 176.0 $ 152.0 $ 119.3    
Restricted cash included in other current assets 0.2   0.2    
Restricted cash included in other long-term assets 5.7   5.7    
Total cash, cash equivalents and restricted cash $ 181.9 $ 157.9 $ 125.2 $ 136.6 $ 125.2