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Quarterly Financial Data (unaudited) - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended								12 Months Ended
	Mar. 31, 2014	Dec. 31, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 31, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information [Line Items]
Losses related to redemption of remaining aggregate principal										$ 14.3	$ 17.9	$ 3.6
Net tax benefits		$ (11.1)	$ (2.2)	$ (15.8)	$ (14.0)	$ (108.9)	$ (6.9)	$ (17.9)	$ (15.4)
2018 and 2020 Notes
Quarterly Financial Information [Line Items]
Losses related to redemption of remaining aggregate principal									$ 17.5		$ 17.5	$ 3.6
2020 Notes
Quarterly Financial Information [Line Items]
Losses related to redemption of remaining aggregate principal					$ 14.3
Percentage of debt redemption	10.00%								10.00%

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Income Tax Expense (Benefit), Discrete Items

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Quarterly Financial Information [Line Items]

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- Definition

Percentage of principal amount of debt redeemed.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629

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