Acquisitions Purchase Price (Details) £ in Millions, $ in Millions			1 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2015 GBP (£)	Sep. 30, 2015 USD ($)	Feb. 28, 2015 USD ($)	Sep. 26, 2015 USD ($)	Sep. 27, 2014 USD ($)	Dec. 31, 2014 GBP (£)	Dec. 31, 2014 USD ($)
Purchase Price
Cash Paid				$ 307.6	$ 13,530.6
Purchase Price Payable				1.3
Cash acquired				(1.6)
Total Purchase Price				307.3
Net Assets Acquired
Current assets				32.4
Property, plant and equipment				10.7
Goodwill				134.0
Other assets				0.2
Liabilities assumed				(6.7)
Total Purchase Price				$ 307.3
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life (in years)				14 years
Other Information
Purchase Price Paid				$ 306.0	$ 13,056.1
Purchase Price Paid For Acquisitions Completed In A Prior Year				11.0
Customer Relationships [Member]
Net Assets Acquired
Definite-lived intangible assets				$ 97.9
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life (in years)				16 years
Product Technology [Member]
Net Assets Acquired
Definite-lived intangible assets				$ 36.5
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life (in years)				10 years
Tradenames and other [Member]
Net Assets Acquired
Definite-lived intangible assets				$ 2.3
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life (in years)				10 years
Advanced Scientifics, Inc. [Member]
Purchase Price
Cash Paid			$ 289.1
Cash acquired			(0.3)
Total Purchase Price			288.8
Net Assets Acquired
Current assets			27.8
Property, plant and equipment			10.6
Goodwill			125.1
Other assets			0.2
Liabilities assumed			(3.7)
Total Purchase Price			288.8
Other Information
Revenue Reported by Acquired Entity							$ 80.0
Goodwill, Expected Tax Deductible Amount			125.1
Advanced Scientifics, Inc. [Member] | Customer Relationships [Member]
Net Assets Acquired
Definite-lived intangible assets			90.0
Advanced Scientifics, Inc. [Member] | Product Technology [Member]
Net Assets Acquired
Definite-lived intangible assets			36.5
Advanced Scientifics, Inc. [Member] | Tradenames and other [Member]
Net Assets Acquired
Definite-lived intangible assets			$ 2.3
Other Acquisitions [Member]
Purchase Price
Cash Paid				$ 18.5
Purchase Price Payable				1.3
Cash acquired				(1.3)
Total Purchase Price				18.5
Net Assets Acquired
Current assets				4.6
Property, plant and equipment				0.1
Goodwill				8.9
Liabilities assumed				(3.0)
Total Purchase Price				18.5
Other Acquisitions [Member] | Customer Relationships [Member]
Net Assets Acquired
Definite-lived intangible assets				$ 7.9
Alfa Aesar [Member]
Purchase Price
Cash Paid	£ 257	$ 389.0
Other Information
Revenue Reported by Acquired Entity | £						£ 78