Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2011

Stock-Based Compensation [Abstract]

Stock-based compensation expense

The following table summarizes our stock-based compensation expense for the years ended December 31:

($ in millions)	2011		2010		2009
Stock option and appreciation rights	$	4.4	$	3.7	$	3.7
Performance-vesting shares		3.0		2.2		1.8
Performance-vesting units		0.2		0.1		-
Performance-vesting shares/units dividend equivalents		0.1		0.2		0.2
Employee stock purchase plan		0.3		0.3		0.3
Deferred compensation plans		0.4		1.3		1.5
Total stock-based compensation expense	$	8.4	$	7.8	$	7.5

Changes in outstanding options

The following table summarizes changes in outstanding options:

(in millions, except per share data)	2011			2010			2009
Options outstanding, January 1		2.9			2.7			2.6
Granted		0.5			0.6			0.4
Exercised		(0.4	)		(0.3	)		(0.3	)
Forfeited		(0.1	)		(0.1	)		-
Options outstanding, December 31		2.9			2.9			2.7
Options exercisable, December 31		1.8			1.8			1.7
Weighted Average Exercise Price		2011			2010			2009
Options outstanding, January 1	$	32.32		$	29.09		$	26.91
Granted		40.85			42.47			32.12
Exercised		17.69			14.88			13.70
Forfeited		41.40			41.47			37.43
Options outstanding, December 31	$	35.79		$	32.32		$	29.09
Options exercisable, December 31	$	32.91		$	27.77		$	24.52

Changes in outstanding SARs

The following table summarizes changes in outstanding SARs:

	2011			2010			2009
SARs outstanding, January 1		111,048			78,512			56,012
Granted		63,024			36,255			22,500
Exercised		(7,685	)		(3,719	)		-
Forfeited		(4,281	)		-			-
SARs outstanding, December 31		162,106			111,048			78,512
SARs exercisable, December 31		58,900			41,439			24,861

Weighted Average Exercise Price	2011		2010		2009
SARs outstanding, January 1	$	39.74	$	38.04	$	40.43
Granted		41.13		42.68		32.09
Exercised		39.15		32.50		-
Forfeited		40.85		-		-
SARs outstanding, December 31		40.28		39.74		38.04
SARs exercisable, December 31	$	39.72	$	39.16	$	39.22

Outstanding PVS awards

The following table summarizes changes in our outstanding PVS awards:

	2011			2010			2009
Non-vested PVS awards, January 1		347,550			327,498			330,458
Granted at target level		101,099			123,068			125,600
Adjustments above/(below) target		(58,175	)		(48,364	)		(5,112	)
Vested and converted		(51,756	)		(50,337	)		(80,083	)
Forfeited		(10,199	)		(4,315	)		(43,365	)
Non-vested PVS awards, December 31		328,519			347,550			327,498
Weighted Average Grant Date Fair Value		2011			2010			2009
Non-vested PVS awards, January 1	$	39.21		$	39.63		$	40.62
Granted at target level		40.85			42.34			32.12
Adjustments above/(below) target		41.95			44.99			32.69
Vested and converted		40.85			38.22			32.69
Forfeited		38.46			37.61			39.10
Non-vested PVS awards, December 31	$	38.77		$	39.21		$	39.63

Outstanding PVU awards

The following table summarizes changes in our outstanding PVU awards:

	2011			2010			2009
Non-vested PVU awards, January 1		23,420			20,792			19,346
Granted at target level		13,442			7,697			7,200
Adjustments above/(below) target		(4,165	)		(2,484	)		(345	)
Vested and converted		(3,963	)		(2,585	)		(5,409	)
Forfeited		(1,718	)		-			-
Non-vested PVU awards, December 31		27,286			23,420			20,792
Weighted Average Grant Date Fair Value		2011			2010			2009
Non-vested PVU awards, January 1	$	38.94		$	39.17		$	39.85
Granted at target level		41.11			42.30			32.09
Adjustments above/(below) target		41.05			38.22			32.59
Vested and converted		40.85			38.22			32.59
Forfeited		37.55			-			-
Non-vested PVU awards, December 31	$	39.30		$	38.94		$	39.17