Net Income Per Common Share (Tables)

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

Summary of Earnings Per Share Basic and Diluted

Computations of basic and diluted net income per common share for the years ended December 31, 2015, 2014 and 2013, are as follows:

(In millions, except per share data)	2015		2014		2013
Net income	$	237.2	$	209.4	$	187.9
Basic net income per common share:
Weighted average common shares outstanding		95.8		96.8		100.0
Basic net income per common share	$	2.48	$	2.16	$	1.88
Diluted net income per common share:
Weighted average common shares outstanding — Basic		95.8		96.8		100.0
Plus incremental shares from assumed conversions:
Restricted stock units		0.5		0.7		0.7
Stock options		0.9		1.2		1.4
Weighted average common shares outstanding — Diluted		97.2		98.7		102.1
Diluted net income per common share	$	2.44	$	2.12	$	1.84
Anti-dilutive shares outstanding, excluded from computation		—		0.2		—