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Supplemental Financial Information (Accounts Receivable, Net) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables $ 637.2 $ 348.1
Allowance for doubtful accounts (8.5) (3.4)
Accounts receivable, net 628.7 344.7
Trade    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables 568.3 301.7
Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables $ 68.9 $ 46.4