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Cash, Cash Equivalents and Restricted Cash (Schedule of Cash, Cash Equivalents and Restricted Cash) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 88.3 $ 123.1    
Restricted cash included in other current assets 18.0 30.3    
Restricted cash included in other long-term assets 5.7 6.3    
Total cash, cash equivalents and restricted cash $ 112.0 $ 159.7 $ 176.3 $ 244.8