Debt - Summary of Long-Term Debt (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 27, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term debt	$ 1,068.7	$ 1,057.1
7.875% Senior Notes due 2018
Debt Instrument [Line Items]
Long-term debt	0	278.8
Weighted Average Interest Rate	0.00%	8.00%
Long-term debt, stated coupon rate		7.875%
8.125% Senior Notes due 2020
Debt Instrument [Line Items]
Long-term debt	243.7	278.3
Weighted Average Interest Rate	8.25%	8.25%
Long-term debt, stated coupon rate	8.125%	8.125%
Long-term debt, maturity date	Mar. 15, 2020	Mar. 15, 2020
4.75% Senior Notes due 2023
Debt Instrument [Line Items]
Long-term debt	500.0	500.0
Weighted Average Interest Rate	4.75%	4.75%
Long-term debt, stated coupon rate	4.75%	4.75%
Long-term debt, maturity date	Jan. 15, 2023	Jan. 15, 2023
5.375% Senior Notes due 2024
Debt Instrument [Line Items]
Long-term debt	$ 325.0	$ 0
Weighted Average Interest Rate	5.375%	0.00%
Long-term debt, stated coupon rate	5.375%
Long-term debt, maturity year	2024