Leases (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Leveraged Leases [Abstract]
Total minimum lease payments receivable, Leveraged Leases	$ 0	$ 617.0
Principal and interest on third-party nonrecourse debt, Leveraged Leases		(518.6)
Net minimum future lease receivable, Leveraged Leases	0	98.4
Estimated non-guaranteed residual value of leased assets, Leveraged Leases	0	20.9
Unearned income, Leveraged Leases	0	(31.8)
Finance leases, Leveraged Leases	0	87.5
Allowance for losses, Leveraged Leases	0	(9.0)
Deferred taxes, Leveraged Leases	0	(62.7)
Net investment in finance leases, Leveraged Leases	0	15.8
Direct Financing [Abstract]
Total minimum lease payments receivable, Direct Financing	327.3	341.4
Principal and interest on third-party nonrecourse debt, Direct Financing	0	0
Net minimum future lease receivable, Direct Financing	327.3	341.4
Estimated non-guaranteed residual value of leased assets, Direct Financing	86.9	93.7
Unearned income, Direct Financing	(168.5)	(187.7)
Finance leases, Direct Financing	245.7	247.4
Allowance for losses, Direct Financing	0	0
Deferred taxes, Direct Financing	0	0
Net investment in finance leases, Direct Financing	245.7	247.4
Finance Leases [Abstract]
Total minimum lease payments receivable, Total Finance Leases	327.3	958.4
Principal and interest on third-party nonrecourse debt, Total Finance Leases	0	(518.6)
Net minimum future lease receivable, Total Finance Leases	327.3	439.8
Estimated non-guaranteed residual value of leased assets, Total Finance Leases	86.9	114.6
Unearned income, Total Finance Leases	(168.5)	(219.5)
Finance leases total financing leases	245.7	334.9
Allowance for losses, Total Finance Leases	0	(9.0)
Deferred taxes, Total Finance Leases	0	(62.7)
Net investment in finance leases, Total Finance Leases	$ 245.7	$ 263.2