Derivatives and Hedging Activities (Details Textuals) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Derivatives and Hedging Activities (Textuals) [Abstract]
Net reduction in interest expense on long term debt and other	$ 55.0	$ 73.0	$ 173.0	$ 214.0
Shares held in equity investment sold	0.0		0.0
Margin On Interest Rate Swap Not Netted	$ 144.0		$ 144.0		$ 149.0
Derivative [Line Items]
Notional amount of long-term debt	17.0		17.0		18.8
Equity investment	49.0		49.0		50.0
Effective portion of gain (loss) on hedges	18.0	384.0	25.0	545.0
Net hedge ineffectiveness	0.0
Derivative Instruments, Gain (Loss) Recognized in Income, Net		8.0		389.0
Not Sold Or Repledged [Member]
Derivative [Line Items]
Securities received as collateral	24.0		24.0		0.0
Risk Exposure Low [Member]
Derivative [Line Items]
Total derivative assets, net	0.0		0.0
Other Expense [Member]
Derivative [Line Items]
Gain (Loss) in Changes of Fair Value of Derivatives not designated as hedges	(4.0)	(3.0)	(12.0)	102.0
Gain on embedded derivatives	1.0	$ (4.0)	7.0	$ (2.0)
ICBC [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Derivative [Line Items]
Equity investment	0.0		0.0
Fair Value Hedges [Member]
Derivative [Line Items]
Notional amount of long-term debt	0.0		0.0		$ 0.0
Net Investment Hedging [Member] | Other Expense [Member]
Derivative [Line Items]
Amount reclassified from AOCI into income	0.0
Net hedge ineffectiveness	0.0
Net Investment Hedging [Member] | Net Investment Hedging [Member] | Other Expense [Member]
Derivative [Line Items]
Amount reclassified from AOCI into income	0.0
Credit Valuation Adjustment [Member]
Derivative [Line Items]
Notional amount of long-term debt	$ 1.0		$ 1.0