Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Y	Dec. 31, 2010	Dec. 31, 2009
Accounting Policies [Abstract]
Advertising costs	$ 122.5	$ 93.3	$ 81.3
Foreign currency exchange transaction gains	$ (2.1)	$ 1.7	$ 2.3
Goodwill and Intangible Assets
Minimum useful life (in years)	1
Maximum useful life (in years)	20
Weighted average useful life (in years)	16.5
Buildings
Property, Plant and Equipment [Line Items]
Minimum useful life (in years)	15
Maximum useful life (in years)	50
Office furniture, fittings and equipment
Property, Plant and Equipment [Line Items]
Minimum useful life (in years)	3
Maximum useful life (in years)	10
Warehouse, laboratory and manufacturing equipment
Property, Plant and Equipment [Line Items]
Minimum useful life (in years)	3
Maximum useful life (in years)	15