Net Income Per Common Share (Tables)

12 Months Ended

Dec. 31, 2020

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, 2020, 2019 and 2018, are as follows:

(In millions, except per share data)	2020		2019		2018
Basic net income per common share:
Net income	$	31.7	$	306.6	$	276.6
Weighted average common shares outstanding		83.8		84.9		87.9
Basic net income per common share	$	0.38	$	3.61	$	3.15
Diluted net income per common share:
Weighted average common shares outstanding — Basic		83.8		84.9		87.9
Plus incremental shares from assumed conversions:
Restricted stock units		0.1		0.3		0.4
Stock options		0.1		0.6		0.7
Weighted average common shares outstanding — Dilutive		84.0		85.8		89.0
Dilutive net income per common share	$	0.38	$	3.57	$	3.11
Anti-dilutive shares outstanding, excluded from computation		0.9		0.1		0.2