Inventoried Costs (Details) (USD $) In Millions, unless otherwise specified	Jun. 29, 2014	Dec. 29, 2013
Inventory Disclosure [Abstract]
Raw materials	$ 44.4	$ 44.5
Work in process	29.5	24.3
Finished goods	4.5	4.6
Supplies and other	2.3	1.9
Subtotal inventoried costs	80.7	75.3
Less: Customer advances and progress payments	(2.2)	(0.7)
Total inventoried costs	$ 78.5	$ 74.6