Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2012

Earnings Per Share [Abstract]

Computation of basic and diluted net income per common share

	Three Months Ended June  30				Six Months Ended June  30
	2012		2011		2012		2011
Numerator:
Net income	$	23.5	$	26.4	$	53.8	$	46.3
Denominator:
Weighted average shares outstanding - basic		46.8		46.4		46.8		46.4
Effect of dilutive securities:
Equity compensation plans		0.6		0.7		0.6		0.6
Convertible preferred stock		0.1		0.1		0.1		0.1
Weighted average shares outstanding - diluted		47.5		47.2		47.5		47.1
Basic earnings per share	$	0.50	$	0.57	$	1.15	$	1.00
Diluted earnings per share	$	0.49	$	0.56	$	1.13	$	0.98