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Supplemental Financial Information (Accounts Receivable, Net) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables $ 439.2 $ 526.7
Allowance for doubtful accounts (9.5) (6.0)
Accounts receivable, net 429.7 520.7
Trade    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables 383.3 466.4
Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables $ 55.9 $ 60.3