Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of the company's stock option activity

A summary of the company’s stock option activity is as follows (in millions, except weighted average exercise price per share):

	Shares		Weighted Average Exercise Price		Aggregate Intrinsic Value
Options outstanding as of January 1, 2014	7.0		$	16.00
Granted	0.3		29.08
Exercised	(1.7	)	10.92
Cancelled	—		27.07
Options outstanding as of December 31, 2014	5.6		$	18.23
Granted	0.7		21.02
Exercised	(0.5	)	9.63
Cancelled	(0.3	)	23.70
Options outstanding as of December 31, 2015	5.5		$	19.04	$	11.0
Options exercisable as of:
December 31, 2015	4.7		$	18.64	$	11.0

Schedule of the options outstanding and exercisable by range of exercise prices

The following table shows the options outstanding and exercisable by range of exercise prices at December 31, 2015 (in millions, except range of exercise price per share, weighted average remaining contractual life and weighted average exercise price):

	Outstanding	Weighted Average Remaining Contractual	Weighted Average		Exercisable	Weighted Average
Range of Exercise Price per Share	Options	Life (Years)	Exercise Price		Options	Exercise Price
$4.41 - $11.34	0.6	2.6	$	4.41	0.6	$	4.41
$11.35 - $16.79	1.6	3.4	13.26		1.5	12.88
$16.80 - $21.80	1.6	4.4	19.82		1.1	19.36
$21.81 - $27.03	0.5	0.3	26.11		0.5	26.11
$27.04- $29.52	0.7	2.9	29.34		0.6	29.41
$29.53 - $30.47	0.1	8.2	30.47		—	30.47
$30.48 - $47.84	0.4	1.5	38.87		0.4	38.87
	5.5	3.1	$	19.04	4.7	$	18.64

Schedule of the assumptions used to estimate the fair value of each option grant

The fair value of each option grant was estimated at the date of grant using the Black-Scholes option-pricing method with the following assumptions:

	2015		2014		2013
Expected Life (years)	6.0		6.0		6.0
Risk-free Interest rate	1.8	%	1.9	%	1.1	%
Expected volatility	56.0	%	55.0	%	56.0	%
Expected dividend yield	0.3	%	0.4	%	0.6	%

Restricted Stock

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of nonvested share activity

A summary of activity for restricted stock awards for the year ended December 31, 2015 is as follows (in millions except weighted average grant date fair value):

	Shares		Weighted Average Grant Date Fair Value
Unvested as of January 1, 2015	0.2		$	16.58
Granted	0.4		21.73
Vested	(0.2	)	17.12
Cancelled	—		21.18
Unvested as of December 31, 2015	0.4		$	21.40

Performance shares

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of nonvested share activity

A summary of activity for restricted stock units for the year ended December 31, 2015 is as follows (in millions except weighted average grant date fair value):

	Shares		Weighted Average Grant Date Fair Value
Unvested as of January 1, 2015	0.8		$	27.09
Granted	0.6		21.06
Vested*	(0.4	)	20.77
Cancelled	(0.3	)	27.64
Unvested as of December 31, 2015	0.7		$	25.53

* Under the terms of the 2013 performance share award, the actual number of shares awarded could have ranged from zero to 0.8 million, depending on the company’s three-year performance as described above. Based on the performance criteria a total of 0.3 million shares was awarded in 2016.