Goodwill and Intangible Assets - Purchased Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 25, 2012	Dec. 30, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Value	$ 207.7		$ 207.7
Accumulated Amortization	(117.8)		(108.5)
Net Value	89.9		99.2
Consolidated amortization expense related to intangible assets subject to amortization	9.3	10.5
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Value	97.7		97.7
Accumulated Amortization	(40.1)		(36.2)
Net Value	57.6		61.5
Contracts and backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Value	80.0		80.0
Accumulated Amortization	(68.6)		(64.3)
Net Value	11.4		15.7
Developed technology and technical know-how
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Value	22.1		22.1
Accumulated Amortization	(6.9)		(6.4)
Net Value	15.2		15.7
Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets			6.9
Gross Value	6.1		6.1
Accumulated Amortization	(1.7)		(1.2)
Net Value	4.4		4.9
Favorable operating lease
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Value	1.8		1.8
Accumulated Amortization	(0.5)		(0.4)
Net Value	$ 1.3		$ 1.4