Condensed Consolidating Financial Information (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended														3 Months Ended			3 Months Ended		12 Months Ended		3 Months Ended			3 Months Ended		12 Months Ended					3 Months Ended
	Mar. 28, 2013	Mar. 29, 2012	Dec. 31, 2012	Sep. 30, 2009 Senior Unsecured Notes Due Two Thousand And Seventeen [Member]	Nov. 18, 2010 Senior Unsecured Notes Due Two Thousand And Twenty [Member]	Mar. 28, 2013 Excluding Subsidiaries [Member]	Mar. 28, 2013 Excluding VIE [Member]	Mar. 28, 2013 VIE Accounts Payable [Member]	Mar. 28, 2013 VIE Accrued Expenses [Member]	Mar. 28, 2013 VIE Property Plant Equipment Net [Member]	Mar. 28, 2013 Class A [Member]	Dec. 31, 2012 Class A [Member]	Mar. 28, 2013 Class B	Dec. 31, 2012 Class B	Mar. 28, 2013 Parent Company [Member]	Mar. 29, 2012 Parent Company [Member]	Dec. 31, 2012 Parent Company [Member]	Mar. 28, 2013 Company Two [Member]	Mar. 29, 2012 Company Two [Member]	Dec. 31, 2011 Company Two [Member]	Dec. 31, 2012 Company Two [Member]	Mar. 28, 2013 Guarantor Subsidiaries [Member]	Mar. 29, 2012 Guarantor Subsidiaries [Member]	Dec. 31, 2012 Guarantor Subsidiaries [Member]	Mar. 28, 2013 Non-Guarantor Subsidiaries [Member]	Mar. 29, 2012 Non-Guarantor Subsidiaries [Member]	Dec. 31, 2011 Non-Guarantor Subsidiaries [Member]	Dec. 31, 2012 Non-Guarantor Subsidiaries [Member]	Mar. 28, 2013 Non-Guarantor Subsidiaries [Member] VIE Accounts Payable [Member]	Mar. 28, 2013 Non-Guarantor Subsidiaries [Member] VIE Accrued Expenses [Member]	Mar. 28, 2013 Non-Guarantor Subsidiaries [Member] VIE Property Plant Equipment Net [Member]	Mar. 28, 2013 Consolidating Adjustments [Member]	Mar. 29, 2012 Consolidating Adjustments [Member]	Dec. 31, 2012 Consolidating Adjustments [Member]
Condensed Consolidating Statements of Operations [Abstract]
Net revenues	$ 1,442.2	$ 1,265.8																$ 1,312.1	$ 1,149.0			$ 48.5	$ 55.4		$ 165.7	$ 136.6						$ (84.1)	$ (75.2)
Operating costs and expenses
Cost of Sales	1,237.1	1,091.1																1,125.8	996.3			45.2	49.3		150.2	120.7						(84.1)	(75.2)
Selling, general and administrative	44.3	45.0													1.0	1.1		37.5	38.8			0.9	0.5		4.9	4.6
Severe Weather Event Charge	8.8																	8.8
Research and development	7.5	7.4																7.0	7.0						0.5	0.4
Total operating costs and expenses	1,297.7	1,143.5													1.0	1.1		1,179.1	1,042.1			46.1	49.8		155.6	125.7						(84.1)	(75.2)
Operating income	144.5	122.3													(1.0)	(1.1)		133.0	106.9			2.4	5.6		10.1	10.9
Interest expense and financing fee amortization	(17.6)	(18.3)																(17.4)	(18.0)						(2.6)	(2.2)						2.4	1.9
Interest income	0.1																	2.5	1.9													(2.4)	(1.9)
Other income (expense), net	(9.9)	3.5																0.8	1.2			0.1			(10.8)	2.3
Income (loss) before income taxes and equity in net loss of affiliates and subsidiaries	117.1	107.5													(1.0)	(1.1)		118.9	92.0			2.5	5.6		(3.3)	11.0
Income tax provision	(35.7)	(33.6)														0.4		(35.1)	(30.2)			(1.0)	(2.1)		0.4	(1.7)
Income (loss) Before Equity In Netincome (Loss) Of Affiliates and subsidiaries	81.4	73.9													(1.0)	(0.7)		83.8	61.8			1.5	3.5		(2.9)	9.3
Equity in net loss of affiliates	(0.2)	(0.3)													(0.2)	(0.3)			(0.4)						(0.2)	0.1						0.2	0.3
Equity in net income of subsidiaries															82.4	74.6		(1.4)	12.8													(81.0)	(87.4)
Net income	81.2	73.6													81.2	73.6		82.4	74.2			1.5	3.5		(3.1)	9.4						(80.8)	(87.1)
Other Comprehensive Income (Loss), Net of Tax	(13.5)	5.1													(13.5)	5.1		0.2							(13.7)	5.1						13.5	(5.1)
Comprehensive Income, Net of Tax, Attributable to Parent	67.7	78.7													67.7	78.7		82.6	74.2			1.5	3.5		(16.8)	14.5						(67.3)	(92.2)
Current assets
Cash and cash equivalents	313.1	134.1																255.0		88.2					58.1		45.9
Accounts receivable, net	587.3		420.7															637.4			513.2	8.5		13.7	172.8			171.7				(231.4)		(277.9)
Inventory	2,492.9		2,410.8															2,084.9			2,006.9	168.1		164.3	239.9			239.7						(0.1)
Deferred tax asset-current	61.5		57.1															60.5			57.1				1.0
Other current assets	24.3		26.1															20.5			22.2				3.8			3.9
Total current assets	3,479.1		3,355.4															3,058.3			2,968.5	176.6		178.0	475.6			486.9				(231.4)		(278.0)
Property, plant and equipment, net	1,718.0		1,698.5				1,717.9											1,250.5			1,221.1	286.5		289.3	180.9			188.1
Variable Interest Entity Assets										0.1																					0.1
Pension assets	84.5		78.4															76.1			69.9				8.4			8.5
Investiment in subsidiary															1,016.5		1,013.7	281.4			281.4											(1,297.9)		(1,295.1)
Equity In Net Assets Of Subsidiaries															1,055.8		983.2	57.9			58.2				1.4							(1,113.7)		(1,041.4)
Deferred tax asset non-current, net	168.7		192.0															169.0			192.3				(0.3)			(0.3)
Other assets	83.4		91.0			82.0												402.0			405.0	80.0		80.0	21.5			27.5				(421.5)		(421.5)
Total assets	5,533.7		5,415.3												2,072.3		1,996.9	5,295.2			5,196.4	543.1		547.3	687.6			710.7				(3,064.5)		(3,036.0)
Current liabilities
Accounts payable	698.6		659.0				698.1											612.6			616.3	154.0		157.2	162.4			163.4				(230.9)		(277.9)
Accrued expenses	234.2		216.3				233.5											208.7			188.4	1.3		2.6	23.5			25.3
Profit sharing	18.2		28.3															17.2			25.9				1.0			2.4
Current portion of long-term debt	10.1		10.3															6.4			6.6				3.7			3.7
Advance payments, short-term	87.6		70.7															87.6			70.7
Deferred revenue, short-term	17.9		18.4															16.3			16.6				1.6			1.8
Deferred Grant Income Liability Current	7.5		6.9																			6.4		5.7	1.1			1.2
Other current liabilities	62.3		57.1															59.8			52.6				2.5			4.5
Variable Interest Entity Liabilities								0.5	0.7																				0.5	0.7
Total current liabilities	1,136.4		1,067.0															1,008.6			977.1	161.7		165.5	197.0			202.3				(230.9)		(277.9)
Long-term debt	1,163.3		1,165.9															1,141.7			1,142.9	80.0		80.0	283.1			284.5				(341.5)		(341.5)
Advance payments, long-term	804.7		833.6															804.7			833.6
Pension/OPEB obligation	76.6		75.6															76.6			75.6
Deferred Grant Income Liability Noncurrent	112.0		116.6																			81.2		83.3	30.8			33.3
Deferred revenue and other deferred credits	29.4		30.8															20.5			21.1				8.9			9.7
Other liabilities	139.0		128.9															198.8			189.3				20.2			19.6				(80.0)		(80.0)
Equity
Preferred stock, par value $0.01, 10,000,000 shares authorized, no shares issued	0		0
Common stock											1.2	1.2	0.2	0.2
Additional paid-in capital	1,015.0		1,012.3
Accumulated other comprehensive loss	(158.7)		(145.2)
Retained earnings	1,212.8		1,127.9
Total shareholders' equity	2,070.5		1,996.4
Noncontrolling interest	1.8	0.5	0.5
Total equity	2,072.3		1,996.9												2,072.3		1,996.9	2,044.3			1,956.8	220.2		218.5	147.6			161.3				(2,412.1)		(2,336.6)
Total liabilities and equity	5,533.7		5,415.3												2,072.3		1,996.9	5,295.2			5,196.4	543.1		547.3	687.6			710.7				(3,064.5)		(3,036.0)
Operating activities
Net cash (used in) operating activities	(45.4)	11.6													81.2	73.9		(42.1)	45.6			2.5	1.6		(5.8)	(35.6)						(81.2)	(73.9)
Investing Activities
Purchase of property, plant and equipment	(74.4)	(54.2)																(68.0)	(42.6)			(2.5)	(1.6)		(3.9)	(10.0)
Purchase Of Property Plant And Equipment Severe Weather Event	(5.8)																	(5.8)
Consolidation Of Variable Interest Entity	2.1																								2.1
Other		(0.7)																3.4	(0.4)						(3.4)	(0.3)
Proceeds from sale of assets	0.1	1.3																0.1								1.3
Equity in net assets of subsidiaries															(81.2)	(73.9)																81.2	73.9
Net cash (used in) investing activities	(78.0)	(53.6)													(81.2)	(73.9)		(70.3)	(43.0)			(2.5)	(1.6)		(5.2)	(9.0)						81.2	73.9
Financing Activities
Proceeds from revolving credit facility		(120.0)																	120.0
Repayments on revolving credit facility		(120.0)																	120.0
Principal payments of debt	(2.6)	(2.5)																(1.7)	(1.7)						(0.9)	(0.8)
Collection on (repayment of) intercompany debt																			(19.5)							19.5
Excess tax benefit of share-based payment arrangements		0.1																	0.1
Net cash provided by (used in) financing activities	(2.6)	(2.4)																(1.7)	(21.1)						(0.9)	18.7
Effect of exchange rate changes on cash and cash equivalents	(1.6)	0.7																							(1.6)		0.7
Net (decrease) in cash and cash equivalents for the period	(127.6)	(43.7)																(114.1)		(18.5)					(13.5)		(25.2)
Cash and cash equivalents, beginning of period	440.7	177.8																369.1	88.2	106.7					71.6	45.9	71.1
Cash and cash equivalents, end of period	313.1	134.1																255.0		88.2					58.1		45.9
Debt Instrument [Line Items]
Debt instrument, face amount				$ 300.0	$ 300.0
Preferred stock, par value	$ 0.01		$ 0.01
Preferred stock, shares authorized	10,000,000		10,000,000
Preferred stock, shares issued	0		0
Common stock, par value											$ 0.01	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized											200,000,000	200,000,000	150,000,000	150,000,000
Common stock, shares issued											119,668,567	119,671,298	24,005,505	24,025,880