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Fair Value Disclosure (Details 3) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Carrying Amount [Member]          
Assets          
Investment Funds $ 0.6   $ 0.6   $ 0.6
Loans 0.4   0.4   6.2
Liabilities          
Recourse fixed rate debt 3,862.3   3,862.3   3,858.5
Recourse floating rate debt 422.8   422.8   417.8
Estimate of Fair Value Measurement [Member]          
Assets          
Investment Funds 1.2   1.2   1.2
Loans 0.4   0.4   6.2
Liabilities          
Recourse fixed rate debt 3,953.8   3,953.8   3,852.6
Recourse floating rate debt 424.4   424.4   $ 412.2
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 $ 1.3 $ (3.6) $ 6.1 $ (2.3)