Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2012	Mar. 29, 2012	Dec. 31, 2011	Mar. 31, 2011	Jun. 28, 2012	Jun. 30, 2011	Sep. 27, 2012	Sep. 29, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Condensed Consolidated Statements of Operations [Abstract]
Net revenues	$ 1,425.6	$ 1,265.8	$ 1,218.9	$ 1,049.6	$ 1,341.0	$ 1,465.6	$ 1,365.3	$ 1,129.7	$ 5,397.7	$ 4,863.8	$ 4,172.4
Operating costs and expenses
Cost of Sales									5,245.3	4,312.1	3,607.9
Gain On Insurance Settlement Severe Weather Event									146.2
Selling, general and administrative									172.2	159.9	156.0
Research and development									34.1	35.7	51.5
Total operating costs and expenses									5,305.4	4,507.7	3,815.4
Operating income	98.0	122.3	102.4	69.6	82.5	63.6	(210.5)	120.5	92.3	356.1	357.0
Interest expense and financing fee amortization									(82.9)	(77.5)	(59.1)
Interest income									0.2	0.3	0.3
Other income (expense), net									1.8	1.4	(0.4)
Income before income taxes and equity in net loss of affiliates									11.4	280.3	297.8
Income tax provision									24.1	(86.9)	(78.2)
Income Before Equity In Net Loss Of Affiliates									35.5	193.4	219.6
Equity in net loss of affiliates									(0.7)	(1.0)	(0.7)
Net income	$ 60.7	$ 73.6	$ 60.4	$ 34.6	$ 34.9	$ 30.1	$ (134.4)	$ 67.3	$ 34.8	$ 192.4	$ 218.9
Earnings per share
Basic	$ 0.43	$ 0.52	$ 0.43	$ 0.25	$ 0.25	$ 0.21	$ (0.94)	$ 0.48	$ 0.24	$ 1.36	$ 1.56
Diluted	$ 0.43	$ 0.52	$ 0.42	$ 0.24	$ 0.24	$ 0.21	$ (0.94)	$ 0.47	$ 0.24	$ 1.35	$ 1.55