Inventoried Costs (Details) (USD $) In Millions, unless otherwise specified	Mar. 30, 2014	Dec. 29, 2013
Inventory Disclosure [Abstract]
Raw materials	$ 45.8	$ 44.5
Work in process	29.5	24.3
Finished goods	4.4	4.6
Supplies and other	2.1	1.9
Subtotal inventoried costs	81.8	75.3
Less: Customer advances and progress payments	(0.7)	(0.7)
Total inventoried costs	$ 81.1	$ 74.6