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Supplemental Financial Information (Accounts Receivable, Net) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables $ 317.0 $ 348.1
Allowance for doubtful accounts (3.3) (3.4)
Accounts receivable, net 313.7 344.7
Trade [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables 274.8 301.7
Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables $ 42.2 $ 46.4