Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2012

Stock-Based Compensation

Schedule of compensation expense

	Years Ended December 31
(in millions, except per share amounts)	2012		2011		2010
Pre-tax compensation expense	$	7.5	$	6.6	$	5.3
After-tax compensation expense	$	4.7	$	4.1	$	3.6
Impact on diluted EPS	$	0.07	$	0.07	$	0.06

Schedule of weighted-average assumptions for stock options

	Years Ended December 31
	2012			2011			2010
Expected dividend yield		1.5	%		1.7	%		1.9	%
Expected life in years		5.78			5.76			5.75
Expected volatility		36.0	%		32.0	%		32.7	%
Risk-free interest rate		0.9	%		2.2	%		2.7	%
Weighted average fair value	$	14.57		$	10.61		$	9.70

Schedule of stock option activity under the Company's stock option awards

	Number of Shares			Weighted Average Exercise Price
Outstanding at December 31, 2009		4,155,470		$	29.09
Options granted		610,020			34.05
Options exercised		(325,883	)		24.68
Options forfeited		(204,304	)		24.32
Outstanding at December 31, 2010		4,235,303		$	30.38
Options granted		637,255			38.23
Options exercised		(552,639	)		27.61
Options forfeited		(227,404	)		29.13
Outstanding at December 31, 2011		4,092,515		$	32.05
Options granted		488,805			49.58
Options exercised		(1,265,768	)		28.45
Options forfeited		(90,421	)		39.67
Outstanding at December 31, 2012		3,225,131		$	35.88

Schedule of activity related to restricted stock

	Number of Shares			Weighted Average Grant Date Fair Value
Outstanding at December 31, 2009		625,570		$	29.07
Shares granted		101,785			34.21
Shares vested		(94,790	)		40.87
Shares forfeited		(7,925	)		30.59
Outstanding at December 31, 2010		624,640		$	28.10
Shares granted		111,685			38.31
Shares vested		(188,195	)		34.80
Shares forfeited		(19,555	)		20.33
Outstanding at December 31, 2011		528,575		$	27.83
Shares granted		85,990			49.60
Shares vested		(305,850	)		21.82
Shares forfeited		(24,480	)		12.18
Outstanding at December 31, 2012		284,235		$	25.99

Schedule of activity related to performance shares

	Number of Performance Units			2012 Awards			2011 Awards			2010 Awards
Outstanding at December 31, 2009		—			—			—			—
Units granted		101,785			—			—			101,785
Units forfeited		(2,950	)		—			—			(2,950	)
Outstanding at December 31, 2010		98,835			—			—			98,835
Units granted		109,075			—			109,075			—
Units forfeited		(10,255	)		—			(6,135	)		(4,120	)
Outstanding at December 31, 2011		197,655			—			102,940			94,715
Units granted		172,375			85,990			—			86,385
Units vested and issued		(90,832	)		—			—			(90,832	)
Units vested and deferred		(24,388	)		—			—			(24,388	)
Units forfeited		(24,080	)		(6,650	)		(9,100	)		(8,330	)
Outstanding at December 31, 2012		230,730			79,340			93,840			57,550