Net Income Per Common Share (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Summary of Earnings Per Share Basic and Diluted

Computations of basic and diluted net income per common share for the years ended December 31, 2018, 2017 and 2016, are as follows:

(In millions, except per share data)	2018		2017		2016
Basic net income per common share:
Net income	$	276.6	$	284.0	$	249.8
Weighted average common shares outstanding		87.9		90.6		92.8
Basic net income per common share	$	3.15	$	3.13	$	2.69
Diluted net income per common share:
Weighted average common shares outstanding — Basic		87.9		90.6		92.8
Plus incremental shares from assumed conversions:
Restricted stock units		0.4		0.4		0.4
Stock options		0.7		0.9		1.0
Weighted average common shares outstanding — Dilutive		89.0		91.9		94.2
Dilutive net income per common share	$	3.11	$	3.09	$	2.65
Anti-dilutive shares outstanding, excluded from computation	0.2		0.2		0.4