Fair Value Disclosure (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Assets
Loans	$ 6.2	$ 8.8
Liabilities
Non-Recourse Debt	0.0	6.9
Carrying Amount [Member]
Assets
Investment Funds	0.6	0.6
Loans		8.8
Liabilities
Recourse fixed rate debt	3,858.5	3,915.0
Recourse floating rate debt	417.8	275.2
Nonrecourse debt		6.9
Estimate of Fair Value Measurement [Member]
Assets
Investment Funds	1.2	1.2
Loans	6.2	8.7
Liabilities
Recourse fixed rate debt	3,852.6	3,882.6
Recourse floating rate debt	412.2	264.6
Nonrecourse debt	0.0	7.1
Not Designated as Hedging Instrument [Member] | Other Expense [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	$ (2.6)	(6.1)	$ (11.4)
Not Designated as Hedging Instrument [Member] | Aae Cargo Ag [Member] | Other Expense [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net		$ 5.1	$ 10.4