Share-Based Compensation (Details) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Exercised	761,000	143,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	1.80%
Expected volatility	27.10%
Risk-free interest rate	1.10%
Expected holding period	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at beginning of period	13,319,750
Options outstanding at beginning of period, weighted average exercise price	$ 9.84
Granted	2,495,850
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 17.41
Exercised	1,731,275
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 9.67
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period	26,034
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price	$ 15.77
Options outstanding at end of period	14,058,291
Options outstanding at end of period, weighted average exercise price	$ 11.19
Options exercisable at March 31, 2012	9,598,541
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 9.03
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Nonvested restricted shares at beginning of period	1,183,229
Nonvested restricted shares at beginning of period, weighted average grant date fair value	$ 11.81
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	344,570
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 17.41
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(187,549)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 11.44
Nonvested restricted shares at end of period	1,340,250
Nonvested restricted shares at end of period, weighted average grant date fair value	$ 13.30