Variable Interest Entities (Details 1) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Carrying amounts and maximum exposure to loss with respect to VIEs
Net Carrying Amount	$ 161.0	$ 136.0
Maximum Exposure to Loss	161.0	136.0
Investments in affiliates [Member]
Carrying amounts and maximum exposure to loss with respect to VIEs
Net Carrying Amount	88.3	60.9
Maximum Exposure to Loss	88.3	60.9
Leveraged leases [Member]
Carrying amounts and maximum exposure to loss with respect to VIEs
Net Carrying Amount	71.8	74.1
Maximum Exposure to Loss	71.8	74.1
Other investment [Member]
Carrying amounts and maximum exposure to loss with respect to VIEs
Net Carrying Amount	0.9	1.0
Maximum Exposure to Loss	$ 0.9	$ 1.0