Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Stock-Based Compensation

Schedule of compensation expense

	Years Ended December 31,
(in millions, except per share amounts)	2015		2014		2013
Pre-tax compensation expense	$	5.1	$	4.5	$	4.9
After-tax compensation expense	$	3.2	$	2.8	$	3.0
Impact on diluted EPS	$	0.05	$	0.04	$	0.05

Schedule of weighted-average assumptions for stock options

	2015			2014			2013
Expected dividend yield		1.1	%		1.2	%		1.2	%
Expected life in years		5.71			5.74			5.71
Expected volatility		27.3	%		29.3	%		32.2	%
Risk-free interest rate		1.4	%		1.7	%		1.0	%
Weighted-average fair value	$	21.19		$	19.15		$	17.58

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

	Shares			Weighted-Average Price
Outstanding at December 31, 2012		3,225,131		$	35.88
Options granted		283,975			64.80
Options exercised		(472,040	)		33.81
Options forfeited		(44,059	)		48.47
Outstanding at December 31, 2013		2,993,007		$	38.76
Options granted		259,035			73.08
Options exercised		(925,520	)		38.63
Options forfeited		(49,885	)		56.89
Outstanding at December 31, 2014		2,276,637		$	42.32
Options granted		316,345			92.84
Options exercised		(748,270	)		38.44
Options forfeited		(34,632	)		81.68
Outstanding at December 31, 2015		1,810,080		$	52.00

Schedule of activity related to restricted stock

	Number of Shares			Weighted-Average Grant Date Fair Value
Outstanding at December 31, 2012		284,235		$	25.99
Shares granted		71,255			64.80
Shares vested		(109,445	)		34.08
Shares forfeited		(5,055	)		47.85
Outstanding at December 31, 2013		240,990		$	49.66
Shares granted		104,773			76.70
Shares vested		(94,590	)		38.57
Shares forfeited		(4,185	)		63.73
Outstanding at December 31, 2014		246,988		$	65.14
Shares granted		58,040			90.54
Shares vested		(75,740	)		49.56
Shares forfeited		(2,881	)		81.32
Outstanding at December 31, 2015		226,407		$	76.66

Schedule of activity related to performance shares

	Number of Peformance Units			2015 Awards			2014 Awards			2013 Awards			2012 Awards			2011 Awards			2010 Awards
Outstanding at December 31, 2012		230,730			—			—			—			79,340			93,840			57,550
Units granted		71,255			—			—			71,255			—			—			—
Units converted to shares		89,610			—			—			—			—			89,610			—
Units vested and issued		(45,544	)		—			—			—			—			—			(45,544	)
Units vested and deferred		(12,006	)		—			—			—			—			—			(12,006	)
Units forfeited		(5,055	)		—			—			(1,080	)		(1,745	)		(2,230	)		—
Outstanding at December 31, 2013		328,990			—			—			70,175			77,595			181,220			—
Units granted		67,970			—			67,970			—			—			—			—
Units converted to shares		69,920			—			—			—			69,920			—			—
Units vested and issued		(135,008	)		—			—			—			—			(135,008	)		—
Units vested and deferred		(46,212	)		—			—			—			—			(46,212	)		—
Units forfeited		(4,185	)		—			(1,465	)		(1,630	)		(1,090	)		—			—
Outstanding at December 31, 2014		281,475			—			66,505			68,545			146,425			—			—
Units granted		58,040			58,040			—			—			—			—			—
Units converted to shares		37,496			—			—			37,496			—			—			—
Units vested and issued		(112,814	)		—			—			—			(112,814	)		—			—
Units vested and deferred		(33,611	)		—			—			—			(33,611	)		—			—
Units forfeited		(2,340	)		(1,220	)		(750	)		(370	)		—			—			—
Outstanding at December 31, 2015		228,246			56,820			65,755			105,671			—			—			—