Share-based Compensation (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2015

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

Summary of information about share-based compensation expense

The first quarter information is presented below:

	Three Months Ended March 31,
Share-based Compensation Expense	2016		2015
Stock options	$	0.5	$	1.2
Restricted stock	0.8		2.1
Restricted stock units issued to Directors	0.3		0.3
Performance shares	0.4		0.6
Total share-based compensation expense	$	2.0	$	4.2

Share-based compensation expense for the years ended December 31, 2015, 2014 and 2013, is presented below:

Share-based Compensation Expense	2015		2014		2013
Stock options	$	1.7	$	1.7	$	1.5
Restricted stock	3.2		3.2		2.9
Restricted stock units issued to Directors	0.9		1.1		1.0
Performance shares	1.9		2.9		4.1
Pre-tax share-based compensation expense	$	7.7	$	8.9	$	9.5

Schedule of weighted-average assumptions used in Black-Scholes option calculation

The following weighted-average assumptions are used in the Black-Scholes option pricing model to estimate the fair value of granted options as of the grant date:

	2015			2014			2013
Expected volatility	67.6% – 75.9%			58.3% – 68.2%			57.8% – 68.8%
Weighted-average volatility	69.4		%	62.6		%	65.2		%
Expected term (in years)	3.1 – 6.6			3.0 – 6.5			2.9 – 6.4
Risk-free interest rate	1.0% – 1.7%			0.9% – 2.3%			0.4% – 1.1%
Dividend yield	—		%	—		%	—		%
Weighted-average grant-date fair value per share of granted options	$	2.36		$	3.50		$	2.44

Schedule of stock options activity

Option activity for the year ended December 31, 2015, is presented below:

Stock Options	Shares		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (in years)	Aggregate Intrinsic Value
Outstanding at December 31, 2014	2,696,595		$	11.16
Granted	906,700		4.08
Exercised	(2,733	)	4.59
Forfeited and expired	(296,570	)	10.81
Outstanding at December 31, 2015	3,303,992		9.26		4.6	$	—
Exercisable at December 31, 2015	1,959,959		12.33		3.3	—
Unvested at December 31, 2015	1,344,033		4.77		6.5	—
Unvested at December 31, 2015 expected to vest	1,276,831		4.77		6.5	—

Schedule of nonvested restricted stock units activity

Non-vested restricted stock awards activity for the year ended December 31, 2015, is presented below:

Restricted Stock Awards	Restricted Shares		Weighted- Average Grant Date Fair Value
Outstanding at December 31, 2014	502,413		$	5.97
Granted	886,060		4.06
Vested/restrictions lapsed	(719,955	)	4.90
Canceled	(69,203	)	5.06
Outstanding at December 31, 2015	599,315		4.54

Schedule of weighted-average assumptions used in Monte Carlo simulation

The following weighted-average assumptions are used in a Monte Carlo simulation model to estimate the fair value of performance shares granted:

	2015			2014			2013
Company expected volatility	56.4		%	59.1		%	59.2		%
S&P’s MidCap 400 index expected volatility	27.0		%	32.4		%	34.7		%
Risk-free interest rate	0.9		%	0.9		%	0.4		%
Dividend yield	—		%	—		%	—		%
Weighted-average grant-date fair value per performance share granted	$	3.09		$	6.40		$	4.68

Schedule of nonvested performance-based units activity

Non-vested performance share awards activity for the year ended December 31, 2015, is presented below:

Performance Share Awards	Performance Shares		Weighted- Average Grant Date Fair Value
Outstanding at December 31, 2014	978,952		$	5.56
Granted	890,700		3.09
Earned	—		—
Expired or forfeited	(865,358	)	4.36
Outstanding at December 31, 2015	1,004,294		4.40