Share-Based Incentive Compensation Plans - Awards Outstanding (Details) (USD $)	3 Months Ended
	Mar. 31, 2014
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Units Granted In Prior Period Excluded From Activity	273,504
Omnibus Plan | Restricted Stock Units (RSUs)
Number of Awards
Outstanding, beginning balance	1,600,000
Granted	1,800,000
Vested	(100,000)
Forfeited	0	[1]
Outstanding, ending balance	3,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding, beginning balance	$ 19.15
Granted	$ 37.01
Vested	$ 19.29
Forfeited	$ 0.00
Outstanding, ending balance	$ 28.66
Omnibus Plan | RSUs - Deal incentive awards
Number of Awards
Outstanding, beginning balance	800,000	[2]
Granted	0	[2]
Vested	(800,000)	[2],[3]
Forfeited	0	[1],[2]
Outstanding, ending balance	0	[2]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding, beginning balance	$ 19.50	[2]
Granted	$ 0.00	[2]
Vested	$ 19.50	[2]
Forfeited	$ 0.00	[2]
Outstanding, ending balance	$ 0.00	[2]
Omnibus Plan | Performance shares (PSU awards)
Number of Awards
Outstanding, beginning balance	500,000
Adjustment for PSU performance factor	300,000
Granted	700,000
Vested	(800,000)
Forfeited	0	[1]
Outstanding, ending balance	700,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding, beginning balance	$ 28.06
Adjustment for PSU performance factor	$ 28.06
Granted	$ 36.98
Vested	$ 28.06
Forfeited	$ 0.00
Outstanding, ending balance	$ 36.86

[1] * Less than $0.1

[2] Excludes 273,504 RSUs granted in 2013 that proportionally vest upon sales of Company stock by ING Group.

[3] As of March 31, 2014, these vested shares have not yet been issued.