Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of stock option activity

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Terms (Years)	Aggregate Intrinsic Value
						(in millions)
Options outstanding at December 31, 2014	95,293		$	8.86	3.1	$1.8
Granted	—		—
Exercised	(34,500	)	$	10.18
Cancelled	—		—
Options outstanding at December 31, 2015	60,793		$	8.12	2.9	$1.0

Schedule of restricted stock activity

	Number of Restricted Share Awards		Weighted Average Grant-Date Fair Value per Award
Restricted share awards outstanding at December 31, 2014	7,412,969		$	21.60
Granted	2,032,012		24.31
Vested	(2,491,358	)	17.42
Forfeited	(155,448	)	29.31
Restricted share awards outstanding at December 31, 2015	6,798,175		$	23.76