Leasing Arrangements (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property, plant and equipment under capital leasing arrangements
Property, plant and equipment	$ 3.7	$ 3.7
Less accumulated depreciation	(1.6)	(1.5)
Net property, plant and equipment	2.1	2.2
Liability balances under capital leasing arrangements
Capital lease obligations	2.0	2.2
Less current maturities	(0.2)	(0.2)
Long-term capital lease obligations, net	1.8	2.0
Future minimum capital lease payments
2012	0.3
Thereafter	1.8
Total minimum lease payments	2.1
Less amounts representing interest	0.1
Present value of future minimum capital lease payments	2.0
Operating leases
Rental expenses on operating leases	15.2	15.0	13.1
Future minimum operating lease payments
2012	9.8
2013	7.6
2014	6.7
2015	3.6
2016	3.4
Thereafter	19.4
Total minimum lease payments	50.5
Buildings
Liability balances under capital leasing arrangements
Capital lease obligations	$ 2.0