Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

Compensation Cost and Related Tax Benefits

Compensation cost and the related tax benefits were as follows:

	Three Months Ended
	March 31,
(in millions)	2013			2012
Stock-based compensation expense	$	3.6		$	4.1
Tax benefit		(1.3	)		(1.4	)
Stock-based compensation expense, net of taxes	$	2.3		$	2.7

Summary of Stock Option Plan Activity

Information on the Company’s stock option plans is summarized below.

	Three Months Ended March 31,
	2013					2012
(in whole shares and dollars)	Shares			Weighted Average Exercise Price		Shares			Weighted Average Exercise Price
Outstanding, beginning of period		2,892,882		$	38.28		2,715,430		$	38.57
Granted		535,300			42.49		517,500			36.81
Exercised		(213,645	)		30.26		(33,224	)		32.24
Expired		—			—		(158,850	)		44.04
Outstanding, end of period		3,214,537			39.52		3,040,856			38.06

Summary of Restricted Stock Activity

The following tables summarize activity information about employee restricted stock units:

	Three Months Ended March 31,
	2013					2012
(in whole shares and dollars)	Shares			Weighted Average Grant Date Fair Value		Shares			Weighted Average Grant Date Fair Value
Time-based restricted stock units:
Outstanding, beginning of period		750,837		$	40.15		768,529		$	40.17
Granted		124,850			42.49		168,750			36.93
Vested		(245,185	)		39.42		(117,522	)		35.27
Forfeited		(1,625	)		39.32		(10,309	)		39.67
Outstanding, end of period		628,877			40.90		809,448			40.21
Performance-based and market-based restricted stock units:
Outstanding, beginning of period		132,775		$	39.97		69,500		$	45.37
Granted		79,850			41.67		99,500			36.61
Outstanding, end of period		212,625			40.61		169,000			40.21