Net Income per Common Share (Tables)

6 Months Ended

Jun. 30, 2015

Earnings Per Share [Abstract]

Summary of Earnings Per Share Basic and Diluted

		QuarterEndedJune30,				SixMonthsEndedJune30,
(In millions, except per share data)		2015		2014		2015		2014
Basic net income per common share:
Net income	...........................................................	$	61.7	$	50.6	$	129.8	$	100.7
Weighted average common shares outstanding	...		96.6		97.3		96.4		97.9
Basic net income per common share	...................	$	0.64	$	0.52	$	1.35	$	1.03
Diluted net income per common share:
Net income	...........................................................	$	61.7	$	50.6	$	129.8	$	100.7
Weighted average common shares outstanding — Basic			96.6		97.3		96.4		97.9
Plus incremental shares from assumed conversions:
Restricted stock units	.................................		0.6		0.7		0.6		0.7
Stock options	..............................................		1.0		1.2		1.0		1.3
Weighted average common shares outstanding — Dilutive			98.2		99.2		98.0		99.9
Diluted net income per common share	................	$	0.63	$	0.51	$	1.32	$	1.01