Share-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2012

Share-Based Compensation [Abstract]

Stock Option Activity

							Weighted		Weighted
							Average		Average	Aggregate
	2007		1998		Total		Exercise		Contractual	Intrinsic
	Plan		Plan		Shares		Price		Life	Value
Outstanding, January 1, 2012	1,329		767		2,096		$	20.11
Granted	111		—		111		$	23.74
Exercised	(313	)	(205	)	(518	)	$	16.63
Forfeited and expired	(5	)	(2	)	(7	)	$	19.90
Outstanding, June 30, 2012	1,122		560		1,682		$	21.43	5.1	$	6,518
Exercisable, June 30, 2012	647		560		1,207		$	21.75	3.9	$	4,363

Non-Vested Restricted Stock Unit Activity

	2007
	Plan		Weighted
	Restricted		Average
	Stock		Grant-Date
	Units		Fair Value
Outstanding, January 1, 2012	394		$	18.45
Granted	189		$	20.95
Vested	(150	)	$	17.15
Canceled	(96	)	$	20.50
Outstanding, June 30, 2012	337		$	20.17

Summary of Compensation Cost and Other Measures Related to Share-Based Payments

	Quarter Ended						Six Months Ended
	June 30,						June 30,
	2012			2011			2012			2011
Share-based expense (net of estimated forfeitures):
Stock options	$	0.2		$	0.2		$	0.4		$	0.4
Non-vested stock/Restricted stock units	0.6			0.5			1.4			0.9
Total share-based expense	0.8			0.7			1.8			1.3
Total recognized tax benefit	(0.3		)	(0.3		)	(0.7		)	(0.5		)
Share-based expense (net of tax)	$	0.5		$	0.4		$	1.1		$	0.8