Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Oct. 02, 2014	Jul. 03, 2014	Apr. 03, 2014	Dec. 31, 2013	Sep. 26, 2013	Jun. 27, 2013	Mar. 28, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Net Revenues	$ 1,609.4	$ 1,593.6	$ 1,698.7	$ 1,742.2	$ 1,574.4	$ 1,693.0	$ 1,803.3	$ 1,728.5	$ 6,643.9	$ 6,799.2	$ 5,961.0
Operating costs and expenses
Cost of sales									5,532.3	5,711.0	6,059.5
Selling, general and administrative									220.8	233.8	200.8
Impact from severe weather event									0.0	0.0	30.3
Research and development									27.8	29.3	34.7
Loss on divestiture of programs - income statement									0.0	471.1	0.0
Total operating costs and expenses									5,780.9	6,445.2	6,325.3
Operating income (loss)	205.8	191.6	230.3	235.3	(272.9)	216.3	216.2	194.4	863.0	354.0	(364.3)
Interest expense and financing fee amortization									(52.7)	(88.1)	(70.1)
Other (expense) income, net									2.2	3.5	(3.6)
Income (loss) before income taxes and equity in net income of affiliates									808.1	262.4	(430.8)
Income tax (provision) benefit									(20.6)	95.9	(191.1)
Income (loss) before equity in net income of affiliates									787.5	358.3	(621.9)
Equity in net income of affiliates									1.2	0.5	0.5
Net income (loss)	$ 138.3	$ 313.6	$ 154.9	$ 181.9	$ (106.2)	$ 168.0	$ 143.4	$ 153.6	$ 788.7	$ 358.8	$ (621.4)
Earnings (loss) per share
Basic (in dollars per share)	$ 1.02	$ 2.25	$ 1.11	$ 1.31	$ (0.77)	$ 1.21	$ 1.01	$ 1.08	$ 5.69	$ 2.55	$ (4.40)
Diluted (in dollars per share)	$ 1.01	$ 2.24	$ 1.11	$ 1.30	$ (0.77)	$ 1.20	$ 1.01	$ 1.07	$ 5.66	$ 2.53	$ (4.40)