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Supplemental Financial Information (Accounts Receivable, Net) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Apr. 30, 2021
Dec. 31, 2020
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]      
Accounts receivable $ 460.6   $ 465.4
Income Taxes Receivable, Current 151.1   190.6
Allowance for doubtful accounts (16.4)   (16.2)
Accounts receivable, net 444.2 $ 425.9 449.2
Trade [Member]      
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]      
Accounts receivable 296.8   260.1
Other Credit Derivatives [Member]      
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]      
Accounts receivable $ 12.7   $ 14.7