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Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits (Table Footnotes) (Detail) - USD ($) $ in Millions	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized tax benefits	$ 924.1	[1]	$ 781.2	[1]	$ 988.1
Other long-term liabilities
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized tax benefits	890.0		704.0
Other Current Liabilities [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized tax benefits	$ 9.0		$ 21.9
[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.

+ References

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

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