Amount of assets pledged to secure a debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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Long-term Debt Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Long-term Debt Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term Debt, Current Maturities	$ 458.1		$ 458.1		$ 2.1
Unamortized Discount (Premium) and Debt Issuance Costs	(6.3)		(6.3)		(3.9)
Loss on early debt extinguishment	(13.2)	$ 0.0	(13.2)	$ 0.0
Non-recourse notes payable 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	368.7		368.7
Debt Instrument, Collateral Amount	410.0		410.0
Long-term Debt, Current Maturities	368.6		368.6
Unamortized Discount (Premium) and Debt Issuance Costs	(0.1)		(0.1)		(0.2)
Senior unsecured notes, maturing 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 350.0		$ 350.0
Debt Instrument, Interest Rate, Stated Percentage	7.50%		7.50%
Repayments of Debt	$ 262.4
Long-term Debt, Current Maturities	86.9		$ 86.9
Unamortized Discount (Premium) and Debt Issuance Costs	(0.7)		(0.7)		$ (3.7)
Loss on early debt extinguishment	13.2
Write off of Deferred Debt Issuance Cost	2.2
Senior unsecured notes, maturing 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 350.0		$ 350.0
Debt Instrument, Interest Rate, Stated Percentage	4.875%		4.875%
Unamortized Discount (Premium) and Debt Issuance Costs	$ (5.2)		$ (5.2)