Property plant and equipment (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 1,136.8	$ 1,077.2
Depreciation expense	71.1	68.8	63.9
Capitalized leased assets, gross, buildings and improvements	2.3	2.4
Capitalized leased assets, gross, machinery and equipment	1.9	3.6
Accumulated depreciation, property, plant and equipment accounted for as capitalized leases	1.1	1.1
Capital Leases, Future Minimum Payments Due [Abstract]
2012	0.4
2013	0.3
2014	0.2
2015	0.2
Accrued liability, construction of new corporate office	22.4
Capitalized interest	1.1	0.9	2.4
Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Expected useful lives, minimum (in years)	5
Expected useful lives, maximum (in years)	50
Property, plant and equipment	284.1	276.4
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Expected useful lives, minimum (in years)	10
Expected useful lives, maximum (in years)	15
Property, plant and equipment	565.7	568.7
Tools, Dies and Molds [Member]
Property, Plant and Equipment [Line Items]
Expected useful lives, minimum (in years)	4
Expected useful lives, maximum (in years)	7
Property, plant and equipment	85.8	84.8
Computer Equipment & Software [Member]
Property, Plant and Equipment [Line Items]
Expected useful lives, minimum (in years)	3
Expected useful lives, maximum (in years)	10
Property, plant and equipment	76.2	68.2
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	8.9	9.0
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 116.1	$ 70.1