Acquisitions Purchase Price (Details) £ in Millions, $ in Millions	1 Months Ended	5 Months Ended		6 Months Ended		12 Months Ended
	Feb. 28, 2015 USD ($)	Dec. 31, 2015 GBP (£)	Dec. 31, 2015 USD ($)	Jun. 27, 2015 USD ($)	Jun. 28, 2014 USD ($)	Dec. 31, 2014 GBP (£)	Dec. 31, 2014 USD ($)
Purchase Price
Cash Paid				$ 298.7	$ 13,529.0
Purchase Price Payable				1.3
Cash acquired				(0.1)
Total Purchase Price				299.9
Net Assets Acquired
Current assets				31.6
Property, plant and equipment				10.6
Goodwill				129.5
Other assets				0.2
Liabilities assumed				(5.1)
Total Purchase Price				$ 299.9
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life (in years)				15 years
Other Information
Purchase Price Paid				$ 298.6	$ 13,054.5
Purchase Price Paid For Acquisitions Completed In A Prior Year				8.0
Customer Relationships [Member]
Net Assets Acquired
Definite-lived intangible assets				$ 94.3
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	(0.1)
Total Purchase Price	289.0
Net Assets Acquired
Current assets	27.8
Property, plant and equipment	10.6
Goodwill	125.2
Other assets	0.2
Liabilities assumed	(3.6)
Total Purchase Price	289.0
Other Information
Revenue Reported by Acquired Entity							$ 80.0
Goodwill, Expected Tax Deductible Amount	125.2
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				$ 9.6
Purchase Price Payable				1.3
Total Purchase Price				10.9
Net Assets Acquired
Current assets				3.8
Goodwill				4.3
Liabilities assumed				(1.5)
Total Purchase Price				10.9
Other Acquisitions [Member] | Customer Relationships [Member]
Net Assets Acquired
Definite-lived intangible assets				$ 4.3
Pending Acquisition - Alfa Aesar [Member]
Other Information
Revenue Reported by Acquired Entity						£ 78	$ 125.0
Pending Acquisition - Alfa Aesar [Member] | Pending Future Acquisition [Member]
Purchase Price
Cash Paid		£ 256	$ 400.0