Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2013

Earnings Per Share [Abstract]

Computation of basic and diluted net income per common share

The following table shows the computation of our basic and diluted net income per common share for the years ending December 31 (in millions, except per share amounts):

	2013		2012		2011
Numerator:
Net income	$	169.3	$	137.3	$	110.8
Denominator:
Denominator for basic earnings per share — weighted average shares	46.4		46.8		46.4
Effect of dilutive securities
Equity compensation plans	0.7		0.7		0.7
Convertible preferred stock	—		0.1		0.1
Weighted average shares outstanding - diluted	47.1		47.6		47.2
Basic earnings per share	$	3.64	$	2.93	$	2.39
Diluted earnings per share	$	3.59	$	2.88	$	2.35