Goodwill and Intangible Assets - Purchased Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 30, 2012	Dec. 25, 2011	Dec. 26, 2010
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Value	$ 207.7	$ 164.7
Accumulated Amortization	(108.5)	(64.6)
Net Value	99.2	100.1
Consolidated amortization expense related to intangible assets subject to amortization	43.9	38.0	9.2
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2013	36.2
2014	21.7
2015	14.4
2016	9.7
2017	8.2
Thereafter	9.0
Total	99.2	100.1
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Value	97.7	78.1
Accumulated Amortization	(36.2)	(19.8)
Net Value	61.5	58.3
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total	61.5	58.3
Contracts and backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Value	80.0	60.1
Accumulated Amortization	(64.3)	(39.6)
Net Value	15.7	20.5
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total	15.7	20.5
Developed technology and technical know-how
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Value	22.1	22.1
Accumulated Amortization	(6.4)	(4.1)
Net Value	15.7	18.0
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total	15.7	18.0
Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Value	6.1	2.6
Accumulated Amortization	(1.2)	(0.8)
Net Value	4.9	1.8
Indefinite-lived intangible assets	6.9	24.5
Fair value of finite-lived intangible assets	6.9
Remaining useful life	2 years
Finite-lived intangible assets impairment charge	14.6
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total	4.9	1.8
Favorable operating lease
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Value	1.8	1.8
Accumulated Amortization	(0.4)	(0.3)
Net Value	1.4	1.5
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total	1.4	1.5
PSS | Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets impairment charge	12.9
KGS | Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets impairment charge	$ 1.7