Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2018	Sep. 28, 2017	Sep. 27, 2018	Sep. 28, 2017
Revenues [Abstract]
Revenue	$ 1,813.7	$ 1,748.2	$ 5,386.7	$ 5,268.4
Operating costs and expenses
Cost of sales	1,543.1	1,486.6	4,601.3	4,762.8
Selling, general and administrative	37.3	49.8	154.5	149.9
Unusual or Infrequent Item, or Both, Net of Insurance Proceeds	0.0	0.0	0.0	19.9
Research and development	10.8	9.5	31.3	21.2
Total operating costs and expenses	1,591.2	1,545.9	4,787.1	4,953.8
Operating income	222.5	202.3	599.6	314.6
Interest expense and financing fee amortization	(24.2)	(10.4)	(60.3)	(30.1)
Other income (expense), net	(7.4)	(11.0)	0.8	(32.2)
Income before income taxes and equity in net income of affiliate	205.7	202.9	538.5	316.7
Income tax provision	(36.9)	(55.9)	(99.7)	(84.9)
Income before equity in net income of affiliate	168.8	147.0	438.8	231.8
Equity in net income of affiliate	0.0	0.2	0.6	0.3
Net income	$ 168.8	$ 147.2	$ 439.4	$ 232.1
Earnings per share
Earnings Per Share, Basic	$ 1.61	$ 1.27	$ 4.02	$ 1.97
Diluted (in dollars per share)	1.59	1.26	3.98	1.95
Common Stock, Dividends, Per Share, Declared	$ 0.12	$ 0.10	$ 0.34	$ 0.30