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Supplemental Financial Information (Accounts Receivable, Net) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables	$ 352.4	$ 369.0
Allowance for doubtful accounts	(3.9)	(23.6)
Accounts receivable, net	348.5	345.4
Trade
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables	334.7	335.4
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables	$ 17.7	$ 33.6

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Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.

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