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Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits (Table Footnotes) (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Income Taxes [Line Items] |  |  |  |  |
Unrecognized tax benefits | $ 1,504.9 | [1] | $ 1,479.2 | [1] | $ 1,439.1
Long-term income taxes |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Unrecognized tax benefits | $ 1,157.5 |  | $ 1,137.8 |  |
[1] | Of this amount, $1,157.5 million and $1,137.8 million are included in Long-term income taxes for 2021 and 2020, respectively, and $332.0 million and $325.0 million are included in Prepaid expenses and other current assets for 2021 and 2020, respectively, on the Consolidated Balance Sheet. The remainder is included in Deferred income taxes on the Consolidated Balance Sheet.

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