Schedule II - Valuation Accounts and Reserves

12 Months Ended

Dec. 31, 2022

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Schedule II - Valuation Accounts and Reserves

(Millions of dollars)	Balance at January 1		Charged to Expense		Deductions		Other		Balance at December 31
2022
Deducted from asset accounts:
Allowance for doubtful accounts	$	1.6	$	—	$	—	$	—	$	1.6
Deferred tax asset valuation allowance	111.2		24.8		—		—		136.0
2021
Deducted from asset accounts:
Allowance for doubtful accounts	$	1.6	$	—	$	—	$	—	$	1.6
Deferred tax asset valuation allowance	106.4		4.8		—		—		111.2
2020
Deducted from asset accounts:
Allowance for doubtful accounts	$	1.6	$	—	$	—	$	—	$	1.6
Deferred tax asset valuation allowance	103.1		3.3		—		—		106.4