Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2012

Stock-Based Compensation [Abstract]

Compensation Cost And Related Tax Benefits

	Three Months Ended March  31,
(in millions)	2012			2011
Stock-based compensation expense	$	4.1		$	3.4
Tax benefit		(1.4	)		(1.2	)
Stock-based compensation expense, net of taxes	$	2.7		$	2.2

Summary Of Stock Option Plan Activity

	Three Months Ended March 31,
	2012					2011
(in whole shares and dollars)	Shares			Weighted Average Exercise Price		Shares			Weighted Average Exercise Price
Outstanding, beginning of period		2,715,430		$	38.57		2,843,909		$	39.22
Granted		517,500			36.81		297,000			46.47
Exercised		(33,224	)		32.24		(117,714	)		33.17
Forfeited or cancelled		—			—		—			—
Expired		(158,850	)		44.04		(256,250	)		57.00
Outstanding, end of period		3,040,856			38.06		2,766,945			38.61

Summary Of Restricted Stock Activity

	Three Months Ended March 31,
	2012					2011
(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		768,529		$	40.17		838,129		$	40.93
Granted		168,750			36.93		95,503			46.49
Vested		(117,522	)		35.27		(185,253	)		45.13
Forfeited		(10,309	)		39.67		(4,380	)		45.67
Outstanding, end of period		809,448			40.21		743,999			40.57
Performance and market-based restricted stock units:
Outstanding, beginning of period		69,500		$	45.37		101,680		$	39.62
Granted		99,500			36.61		42,500			46.47
Vested		—			—		(25,055	)		45.21
Forfeited		—			—		—			—
Outstanding, end of period		169,000			40.21		119,125			40.89