Net Income per Common Share (Tables)

9 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

Summary of Earnings Per Share Basic and Diluted

	Quarter Ended September 30,				Nine Months Ended September 30,
(In millions, except per share data)	2017		2016		2017		2016
Basic net income per common share:
Net income	$	69.7	$	68.2	$	195.9	$	190.3
Weighted average common shares outstanding		90.1		92.7		90.7		93.1
Basic net income per common share	$	0.77	$	0.74	$	2.16	$	2.04
Diluted net income per common share:
Net income		69.7		68.2		195.9		190.3
Weighted average common shares outstanding — Basic		90.1		92.7		90.7		93.1
Plus incremental shares from assumed conversions:
Restricted stock units		0.4		0.4		0.4		0.5
Stock options		0.9		1.0		1.0		1.0
Weighted average common shares outstanding — Dilutive		91.4		94.1		92.1		94.6
Diluted net income per common share	$	0.76	$	0.72	$	2.13	$	2.01