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Debt - Summary of Long-Term Debt (Detail) - USD ($) $ in Millions	Sep. 26, 2015		Dec. 31, 2014	Nov. 30, 2014
Debt Instrument [Line Items]
Long-term debt, total	$ 1,979.5		$ 1,718.7
Less — Current portion	(16.9)	[1]	(243.7)
Long-term debt	1,962.6	[1]	1,475.0
Other
Debt Instrument [Line Items]
Long-term debt, total	7.6		0.0
Credit Agreement — Term Loan Facility | Term Loan Facility
Debt Instrument [Line Items]
Long-term debt, total	$ 496.9		$ 0.0
Weighted Average Interest Rate	1.65%
8.125% Senior Notes due 2020 | Senior notes
Debt Instrument [Line Items]
Long-term debt, stated coupon rate	8.125%		8.125%
Long-term debt, total	$ 0.0		$ 243.7
Weighted Average Interest Rate			8.25%
4.75% Senior Notes due 2023 | Senior notes
Debt Instrument [Line Items]
Long-term debt, stated coupon rate	4.75%		4.75%
Long-term debt, total	$ 500.0		$ 500.0
Weighted Average Interest Rate	4.75%		4.75%
5.375% Senior Notes due 2024 | Senior notes
Debt Instrument [Line Items]
Long-term debt, stated coupon rate	5.375%		5.375%
Long-term debt, total	$ 325.0		$ 325.0
Weighted Average Interest Rate	5.375%		5.375%
5.25% Senior Notes due 2025 | Senior notes
Debt Instrument [Line Items]
Long-term debt, stated coupon rate	5.25%		5.25%	5.25%
Long-term debt, total	$ 650.0		$ 650.0
Weighted Average Interest Rate	5.25%		5.25%
[1] Unaudited.

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- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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Contractual interest rate for funds borrowed, under the debt agreement.

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