Variable Interest Entities (Details 1) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Carrying amounts and maximum exposure to loss with respect to VIEs
Net Carrying Amount	$ 111.4	$ 151.6
Maximum Exposure to Loss	111.4	151.6
Investments in Affiliates [Member]
Carrying amounts and maximum exposure to loss with respect to VIEs
Net Carrying Amount	110.7	72.2
Maximum Exposure to Loss	110.7	72.2
Leveraged leases [Member]
Carrying amounts and maximum exposure to loss with respect to VIEs
Net Carrying Amount	0	78.5
Maximum Exposure to Loss	0	78.5
Other investment [Member]
Carrying amounts and maximum exposure to loss with respect to VIEs
Net Carrying Amount	0.7	0.9
Maximum Exposure to Loss	$ 0.7	$ 0.9