Business Acquisitions, Goodwill and Acquired Intangible Assets (Acquired Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 30, 2012
Schedule of Intangible Assets, Including Goodwill [Line Items]
Weighted average useful life in years	5 years 6 months 6 days
Goodwill	$ 1,150.6	$ 1,037.8	$ 990.2
Proprietary technology
Schedule of Intangible Assets, Including Goodwill [Line Items]
Weighted average useful life in years	5 years 2 months 6 days
Customer list/relationships
Schedule of Intangible Assets, Including Goodwill [Line Items]
Weighted average useful life in years	6 years 0 months 6 days
Backlog
Schedule of Intangible Assets, Including Goodwill [Line Items]
Weighted average useful life in years	3 months 6 days
Trademarks
Schedule of Intangible Assets, Including Goodwill [Line Items]
Weighted average useful life in years	6 years 9 months 6 days
Trademarks
Schedule of Intangible Assets, Including Goodwill [Line Items]
Intangibles not subject to amortization	105.8	102.5
Acquisitions in 2014
Schedule of Intangible Assets, Including Goodwill [Line Items]
Intangibles subject to amortization	40.6
Intangibles not subject to amortization	7.6
Total acquired intangible assets	48.2
Weighted average useful life in years	11 years 0 months 6 days
Goodwill	142.8
Acquisitions in 2014 | Proprietary technology
Schedule of Intangible Assets, Including Goodwill [Line Items]
Intangibles subject to amortization	18.4
Weighted average useful life in years	11 years 0 months 6 days
Acquisitions in 2014 | Customer list/relationships
Schedule of Intangible Assets, Including Goodwill [Line Items]
Intangibles subject to amortization	21.4
Weighted average useful life in years	11 years 3 months 6 days
Acquisitions in 2014 | Backlog
Schedule of Intangible Assets, Including Goodwill [Line Items]
Intangibles subject to amortization	0.8
Weighted average useful life in years	4 months 6 days
Acquisitions in 2014 | Trademarks
Schedule of Intangible Assets, Including Goodwill [Line Items]
Intangibles not subject to amortization	7.6
Acquisitions in 2013
Schedule of Intangible Assets, Including Goodwill [Line Items]
Intangibles subject to amortization		29.3
Intangibles not subject to amortization		11.3
Total acquired intangible assets		40.6
Weighted average useful life in years		9 years 7 months 6 days
Goodwill		62.5
Acquisitions in 2013 | Proprietary technology
Schedule of Intangible Assets, Including Goodwill [Line Items]
Intangibles subject to amortization		17.5
Weighted average useful life in years		10 years
Acquisitions in 2013 | Customer list/relationships
Schedule of Intangible Assets, Including Goodwill [Line Items]
Intangibles subject to amortization		11.1
Weighted average useful life in years		9 years 8 months 12 days
Acquisitions in 2013 | Backlog
Schedule of Intangible Assets, Including Goodwill [Line Items]
Intangibles subject to amortization		0.7
Weighted average useful life in years		7 months 6 days
Acquisitions in 2013 | Trademarks
Schedule of Intangible Assets, Including Goodwill [Line Items]
Intangibles not subject to amortization		$ 11.3