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Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, beginning balance	$ 924.1	[1]	$ 781.2
Decreases for positions taken in prior years	(13.7)		(37.1)
Increases for positions taken in prior years	143.9		150.1
Increases for positions related to the current year	140.2		116.6
Settlements with taxing authorities	(6.5)		(17.7)
Lapsing of statutes of limitations	(7.6)		(69.0)
Unrecognized tax benefits	$ 1,180.4		$ 924.1	[1]
[1] Of this amount, $1,132.3 million and $890.0 million are included in Other long-term liabilities for 2017 and 2016, respectively, and $30.8 million and $9.0 million are included in Current liabilities - income taxes for 2017 and 2016, respectively, on the consolidated balance sheet. The remainder is included in Deferred income taxes on the consolidated balance sheet.

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Amount of unrecognized tax benefits.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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-Section 50
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