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Supplemental Financial Information (Accounts Receivable, Net) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]
Accounts receivable	$ 465.4	$ 526.7
Income Taxes Receivable, Current	190.6	39.3
Allowance for doubtful accounts	(16.2)	(6.0)
Accounts receivable, net	449.2	520.7
Trade [Member]
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]
Accounts receivable	260.1	466.4
Other Credit Derivatives [Member]
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]
Accounts receivable	$ 14.7	$ 21.0

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount of allowance for credit loss on accounts receivable, classified as current.

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Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable.

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