STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2014

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

Stock-based compensation expense was as follows:



	Years ended December 31,
	2014			2013		2012
	($ in millions)
Stock-based compensation	$	9.2		$	13.3	$	8.4
Mark-to-market adjustments	(3.6		)	4.2		0.9
Total expense	$	5.6		$	17.5	$	9.3

Stock Options Activity

Stock option transactions were as follows:



						Exercisable
	Shares		Option Price	Weighted Average Option Price		Options	Weighted Average Exercise Price
Outstanding at January 1, 2014	4,114,822		$14.28-23.78	$	19.33	3,011,702	$	18.29
Granted	624,200		25.27-27.64	25.69
Exercised	(572,607	)	14.28-23.78	20.13
Canceled	(32,662	)	18.52-25.57	23.81
Outstanding at December 31, 2014	4,133,753		$14.28-27.64	$	20.14	2,976,870	$	18.50

Stock Options Exercisable, Exercise Price Range

The following table provides certain information with respect to stock options exercisable at December 31, 2014:



Range of Exercise Prices	Options Exercisable	Weighted Average Exercise Price		Options Outstanding	Weighted Average Exercise Price
Under $16.00	939,928	$	15.03	939,928	$	15.03
$16.00 – $20.00	766,746	$	18.01	766,746	$	18.01
Over $20.00	1,270,196	$	21.37	2,427,079	$	22.80
	2,976,870			4,133,753

Common shares reserved and available for grant or purchase

At December 31, 2014, common shares reserved for issuance and available for grant or purchase under the following plans consisted of:



	Number of Shares
Stock Option Plans	Reserved for Issuance	Available for Grant or Purchase⁽¹⁾
2000 long term incentive plan	346,368	13,411
2003 long term incentive plan	426,068	14,638
2006 long term incentive plan	1,613,349	207,783
2009 long term incentive plan	2,884,827	432,029
2014 long term incentive plan	3,000,000	3,000,000
	8,270,612	3,667,861
1996 stock option plan (plan expired)	31,602	—
Total under stock option plans	8,302,214	3,667,861



	Number of Shares
Stock Purchase Plans	Reserved for Issuance	Available for Grant or Purchase
1997 stock plan for non-employee directors	582,962	130,660
Employee deferral plan	45,871	45,623
Total under stock purchase plans	628,833	176,283

Performance Shares Transactions

Performance share transactions were as follows:



	To Settle in Cash				To Settle in Shares
	Shares		Weighted Average Fair Value per Share		Shares		Weighted Average Fair Value per Share
Outstanding at January 1, 2014	296,222		$	28.90	289,000		$	21.48
Granted	84,500		25.57		84,500		25.57
Paid/Issued	(88,611	)	28.90		(84,500	)	18.78
Converted from shares to cash	3,403		23.17		(3,403	)	23.17
Canceled	(4,597	)	27.44		(4,597	)	24.16
Outstanding at December 31, 2014	290,917		$	23.04	281,000		$	23.46
Total vested at December 31, 2014	203,583		$	23.04	193,667		$	22.89

Summary of Unvested Performance Shares

The summary of the status of our unvested performance shares to be settled in cash were as follows:



	Shares		Weighted Average Fair Value per Share
Unvested at January 1, 2014	102,166		$	28.90
Granted	84,500		25.57
Vested	(94,735	)	23.04
Canceled	(4,597	)	27.44
Unvested at December 31, 2014	87,334		$	23.04

- Definition

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

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