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Leases, (Tables)
 12 Months Ended
Dec. 31, 2025
Leases [Abstract]  
Other Information Related to Operating Leases Table Text Block
Year Ended December 31,
Other information related to operating leases202520242023
(Millions of dollars)
Weighted-average remaining lease term3 years4 years4 years
Weighted-average discount rate4.25 %4.37 %4.28 %
Supplemental cash flows information
Lease payments$(7.8)$(7.9)$(8.3)
Right-of-use assets obtained in exchange for lease obligations2.3 2.7 3.9 
Lessee, Operating Lease, Liability, to be Paid, Maturity
December 31,
Future minimum lease payments under non-cancellable operating leases2025
(Millions of dollars)
2026$5.3 
20273.5 
20283.0 
20291.5 
2030— 
Thereafter— 
Total future minimum lease payments13.3 
Imputed interest(0.8)
Total operating lease liability$12.5 

December 31,
Consolidated balance sheets20252024
(Millions of dollars)
Current operating lease liability$4.9 $5.2 
Long-term operating lease liability7.6 11.4 
 Total operating lease liability$12.5 $16.6