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Cash, Cash Equivalents and Restricted Cash (Schedule of Cash, Cash Equivalents and Restricted Cash) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 140.1 $ 208.8    
Restricted cash included in other current assets 16.4 16.3    
Restricted cash included in other long-term assets 19.8 19.7    
Total cash, cash equivalents and restricted cash $ 176.3 $ 244.8 $ 183.7 $ 296.7