Net Income Per Common Share (Tables)

3 Months Ended

Sep. 30, 2012

Net Income Per Common Share [Abstract]

Calculation Of Net Income Per Basic And Diluted Weighted-Average Common Shares Outstanding

		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2012		2011		2012		2011
Net income (in millions)		$	44.9	$	47.0	$	100.1	$	98.1
Basic weighted-average common shares outstanding			44,197,164		44,521,757		44,263,445		45,102,716
Stock options			41,208		55,910		83,759		152,368
Stock awards			0		0		2,521		1,323
Diluted weighted-average common shares outstanding			44,238,372		44,577,667		44,349,725		45,256,407
Net income per common share:
	Net income per basic common share	$	1.02	$	1.06	$	2.26	$	2.18
	Net income per diluted common share		1.01		1.05		2.26		2.17
Antidilutive shares not included in net income per diluted common
	share calculation		2,479,470		2,264,262		2,199,795		1,903,674