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Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016		Dec. 31, 2015
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, beginning balance		$ 781.2	[1]	$ 988.1
Decreases for positions taken in prior years		(37.1)		(49.9)
Increases for positions taken in prior years		150.1		30.5
Increases for positions related to the current year		116.6		83.7
Settlements with taxing authorities		(17.7)		(258.0)
Lapsing of statutes of limitations		(69.0)		(13.2)
Unrecognized tax benefits	[1]	$ 924.1		$ 781.2
[1] Of this amount, $890.0 million and $704.0 million are included in Other long-term liabilities for 2016 and 2015, respectively, and $9.0 million and $21.9 million are included in Current liabilities - income taxes for 2016 and 2015, 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 pertaining to uncertain tax positions taken in tax returns.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
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-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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