Goodwill and Intangible Assets - Purchased Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 25, 2011	Sep. 30, 2012	Sep. 25, 2011	Dec. 25, 2011
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Value	$ 204.7		$ 204.7		$ 164.7
Accumulated Amortization	(97.0)		(97.0)		(64.6)
Net Value	107.7		107.7		100.1
Consolidated amortization expense related to intangible assets subject to amortization	13.0	11.9	32.4	24.5
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2012 (remaining three months)	11.6		11.6
2013	34.7		34.7
2014	20.2		20.2
2015	14.4		14.4
2016	9.7		9.7
Thereafter	17.1		17.1
Total	107.7		107.7		100.1
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Value	97.7		97.7		78.1
Accumulated Amortization	(31.7)		(31.7)		(19.8)
Net Value	66.0		66.0		58.3
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total	66.0		66.0		58.3
Contracts and backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Value	80.0		80.0		60.1
Accumulated Amortization	(58.0)		(58.0)		(39.6)
Net Value	22.0		22.0		20.5
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total	22.0		22.0		20.5
Developed technology and technical know-how
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Value	22.1		22.1		22.1
Accumulated Amortization	(5.8)		(5.8)		(4.1)
Net Value	16.3		16.3		18.0
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total	16.3		16.3		18.0
Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Value	3.1		3.1		2.6
Accumulated Amortization	(1.1)		(1.1)		(0.8)
Net Value	2.0		2.0		1.8
Indefinite-lived intangible assets	24.5		24.5		24.5
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total	2.0		2.0		1.8
Favorable operating lease
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Value	1.8		1.8		1.8
Accumulated Amortization	(0.4)		(0.4)		(0.3)
Net Value	1.4		1.4		1.5
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total	$ 1.4		$ 1.4		$ 1.5