Net Income per Common Share (Tables)

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Summary of Earnings Per Share Basic and Diluted

	Quarter Ended March 31,
(In millions, except per share data)	2015		2014
Basic net income per common share:
Net income	$	68.1	$	50.1
Weighted average common shares outstanding		96.2		98.5
Basic net income per common share	$	0.71	$	0.51
Diluted net income per common share:
Net income	$	68.1	$	50.1
Weighted average common shares outstanding — Basic		96.2		98.5
Plus incremental shares from assumed conversions:
Restricted stock units		0.6		0.7
Stock options		1.1		1.4
Weighted average common shares outstanding — Dilutive		97.9		100.6
Diluted net income per common share	$	0.70	$	0.50