Net Income per Common Share (Tables)

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

Summary of Earnings Per Share Basic and Diluted

	Quarter Ended March 31,
(In millions, except per share data)	2016		2015
Basic net income per common share:
Net income	$	56.0	$	68.1
Weighted average common shares outstanding		93.4		96.2
Basic net income per common share	$	0.60	$	0.71
Diluted net income per common share:
Net income	$	56.0	$	68.1
Weighted average common shares outstanding — Basic		93.4		96.2
Plus incremental shares from assumed conversions:
Restricted stock units		0.4		0.6
Stock options		1.0		1.1
Weighted average common shares outstanding — Dilutive		94.8		97.9
Diluted net income per common share	$	0.59	$	0.70