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Supplemental Financial Information (Accounts Receivable, Net) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Apr. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables	$ 472.2		$ 465.4
Allowance for doubtful accounts	(16.4)		(16.2)
Accounts receivable, net	455.8	$ 425.9	449.2
Trade
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables	301.1		260.1
Income Tax Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables	160.0		190.6
Other Accounts Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables	$ 11.1		$ 14.7

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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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