Fair Value Disclosure (Details 3) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets
Loans	$ 97.3	$ 122.7
Liabilities
Non-Recourse Debt	15.9	72.6
Carrying Amount [Member]
Assets
Investment Funds	1.5	1.7
Loans		122.7
Liabilities
Recourse fixed rate debt	3,639.9	2,871.2
Recourse floating rate debt	540.0	894.7
Nonrecourse debt		72.6
Estimate of Fair Value Measurement [Member]
Assets
Investment Funds	2.4	4.0
Loans	97.4	121.5
Liabilities
Recourse fixed rate debt	3,775.0	2,994.0
Recourse floating rate debt	540.0	906.2
Nonrecourse debt	$ 16.6	$ 74.7