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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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