Financial Instruments (Details 6) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Carrying amounts of assets under capital lease
Gross assets under capital lease	$ 18.6	$ 18.7
Less accumulated depreciation	(4.8)	(3.7)
Net assets under capital lease	13.8	15.0
Buildings
Carrying amounts of assets under capital lease
Gross assets under capital lease	16.5	17.0
Machinery and equipment
Carrying amounts of assets under capital lease
Gross assets under capital lease	2.1	1.7
Other
Carrying amounts of assets under capital lease
Gross assets under capital lease	$ 0