Other Expense, Net

6 Months Ended

Jun. 30, 2022

Other Income And Expenses [Abstract]

Other Expense, Net

8. Other Expense, Net

Other expense, net, consisted of the following (in millions of dollars):

	Quarter Ended June 30,						Six Months Ended June 30,
	2022			2021			2022			2021
Interest income	$	0.2		$	—		$	0.2		$	0.1
Net periodic postretirement benefit cost		(1.5	)		(1.2	)		(2.9	)		(1.8	)
Unrealized (loss) gain on equity securities		(0.7	)		0.1			(1.1	)		—
Gain (loss) on extinguishment of debt		—			(35.9	)		—			(35.9	)
All other, net		(1.7	)		0.4			(1.5	)		0.6
Other expense, net	$	(3.7	)	$	(36.6	)	$	(5.3	)	$	(37.0	)