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Leases, (Tables)
 12 Months Ended
Dec. 31, 2024
Leases [Abstract]  
Other Information Related to Operating Leases Table Text Block
Year Ended
December 31,
Other information related to operating leases202420232022
(Millions of dollars)
Weighted-average remaining lease term4 years4 years5 years
Weighted-average discount rate4.37 %4.28 %4.04 %
Supplemental cash flows information
Lease payments$(7.9)$(8.3)$(8.2)
Right-of-use assets obtained in exchange for lease obligations$2.7 $3.9 $0.3 
Lessee, Operating Lease, Liability, to be Paid, Maturity
December 31,
Future minimum lease payments under non-cancellable operating leases2024
(Millions of dollars)
2025$5.9 
20264.3 
20273.3 
20283.0 
20291.5 
Thereafter— 
Total future minimum lease payments$18.0 
Imputed interest(1.4)
Total operating lease liability$16.6 
Consolidated balance sheets as of December 31, 2024
Current operating lease liability$5.2 
Long-term operating lease liability11.4 
Total operating lease liability$16.6