Net Income per Common Share (Tables)

6 Months Ended

Jun. 30, 2016

Earnings Per Share [Abstract]

Summary of Earnings Per Share Basic and Diluted

	Quarter Ended June 30,				Six Months Ended June 30,
(In millions, except per share data)	2016		2015		2016		2015
Basic net income per common share:
Net income	$	66.1	$	61.7	$	122.1	$	129.8
Weighted average common shares outstanding		93.1		96.6		93.3		96.4
Basic net income per common share	$	0.71	$	0.64	$	1.31	$	1.35
Diluted net income per common share:
Net income	$	66.1	$	61.7	$	122.1	$	129.8
Weighted average common shares outstanding — Basic		93.1		96.6		93.3		96.4
Plus incremental shares from assumed conversions:
Restricted stock units		0.5		0.6		0.4		0.6
Stock options		1.0		1.0		1.0		1.0
Weighted average common shares outstanding — Dilutive		94.6		98.2		94.7		98.0
Dilutive net income per common share	$	0.70	$	0.63	$	1.29	$	1.32