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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

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