Schedule II - Valuation Accounts and Reserves

12 Months Ended

Dec. 31, 2023

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
2023
Deducted from asset accounts:
Allowance for doubtful accounts	$	1.6	$	–	$	–	$	–	$	1.6
Deferred tax asset valuation allowance	136.0		10.9		–		–		146.9
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