Net Income Per Common Share (Tables)

12 Months Ended

Dec. 31, 2019

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, 2019, 2018 and 2017, are as follows:

(In millions, except per share data)	2019		2018		2017
Basic net income per common share:
Net income	$	306.6	$	276.6	$	284.0
Weighted average common shares outstanding		84.9		87.9		90.6
Basic net income per common share	$	3.61	$	3.15	$	3.13
Diluted net income per common share:
Weighted average common shares outstanding — Basic		84.9		87.9		90.6
Plus incremental shares from assumed conversions:
Restricted stock units		0.3		0.4		0.4
Stock options		0.6		0.7		0.9
Weighted average common shares outstanding — Dilutive		85.8		89.0		91.9
Dilutive net income per common share	$	3.57	$	3.11	$	3.09
Anti-dilutive shares outstanding, excluded from computation	0.1		0.2		0.2