Purchase Price Allocation among Assets Acquired and Liabilities Assumed in Acquisitions (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Current assets	$ 62.8
Property, plant and equipment	22.0
Goodwill	164.0
Total assets acquired	476.3
Current liabilities	21.4
Deferred tax liabilities	24.3
Other long term liabilities	8.4
Liabilities assumed	54.1
Net assets acquired	422.2
In Process Research and Developments
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Intangible assets	46.9
Intellectual Property
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Intangible assets	70.7
Trade names
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Intangible assets	65.3
Customer Lists
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Intangible assets	$ 44.6