Net Income (Loss) Per Common Share (Tables)

6 Months Ended

Jun. 30, 2021

Earnings Per Share [Abstract]

Summary of Earnings Per Share Basic and Diluted

	Quarter Ended June 30,					Six Months Ended June 30,
(In millions, except per share data)	2021		2020			2021			2020
Basic net income (loss) per common share:
Net income (loss)	$	2.2	$	(1.0	)	$	(11.8	)	$	41.4
Weighted average common shares outstanding		84.1		83.7			84.0			83.7
Basic net income (loss) per common share	$	0.03	$	(0.01	)	$	(0.14	)	$	0.49
Diluted net income (loss) per common share:
Net income (loss)		2.2		(1.0	)		(11.8	)		41.4
Weighted average common shares outstanding — Basic		84.1		83.7			84.0			83.7
Plus incremental shares from assumed conversions:
Restricted stock units		0.3		—			—			0.2
Stock options		0.3		—			—			0.2
Weighted average common shares outstanding — Dilutive		84.7		83.7			84.0			84.1
Diluted net income (loss) per common share	$	0.03	$	(0.01	)	$	(0.14	)	$	0.49