Contingencies, Guarantees and Indemnifications (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating leases
Operating lease rental expense	$ 51.1	$ 53.1	$ 54.4
Operating lease obligations
Year 1: Operating lease obligations	45.8
Year 2: Operating lease obligations	36.6
Year 3: Operating lease obligations	29.7
Year 4: Operating lease obligations	22.3
Year 5: Operating lease obligations	11.8
Year 6 and thereafter: Operating lease obligations	61.8
Total operating lease obligations	208.0
Less: Future sublease rental income on noncancelable leases	4.3
Total future minimum lease payments	203.7
Capital leases
Capital lease gross asset balance	24.4	17.4
Capital lease accumulated depreciation	13.7	13.4
Capital lease depreciation expense	4.4	4.2	5.2
Capital lease future minimum lease payments
Year 1: Capital lease future minimum lease payments	4.3
Year 2: Capital lease future minimum lease payments	3.5
Year 3: Capital lease future minimum lease payments	3.1
Year 4: Capital lease future minimum lease payments	0.5
Total capital lease future minimum lease payments	11.4
Less: Amounts representing interest	0.5
Net present value of minimum lease payments	$ 10.9