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Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, beginning balance		$ 1,342.8	[1]	$ 1,180.4
Decreases for positions taken in prior years		(18.3)		(64.1)
Increases for positions taken in prior years		107.1		180.8
Increases for positions related to the current year		88.3		75.1
Settlements with taxing authorities		(68.6)		(24.1)
Lapsing of statutes of limitations		(12.2)		(5.3)
Unrecognized tax benefits	[1]	$ 1,439.1		$ 1,342.8
[1] Of this amount, $1,285.3 million and $1,313.7 million are included in Long-term income taxes for 2019 and 2018, respectively, and $138.8 million and $12.5 million are included in Prepaid expenses and other current assets for 2019 and 2018, respectively, on the Consolidated Balance Sheet. The remainder is included in Deferred income taxes on the Consolidated Balance Sheet.

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