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Goodwill and Intangible Assets
 3 Months Ended
Mar. 31, 2026
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
The Company's goodwill is assigned to its Marketing segment and none of the goodwill is deductible for tax purposes.
(Millions of dollars)March 31,
2026		December 31,
2025
Goodwill$328.0 $328.0 

We amortize intangible assets subject to amortization on a straight-line basis based on the period for which the economic benefits of the asset or liability are expected to be realized. The intangible assets subject to amortization includes pipeline space, which is being amortized over a 40-year life, and the intangible lease liability acquired from QuickChek that is being amortized over the remaining life of the underlying leases.
Intangible assets subject to amortization at March 31, 2026 and December 31, 2025 consisted of the following:

Remaining Useful Life (in years)March 31, 2026December 31, 2025
(Millions of dollars)CostNetCostNet
Intangible assets subject to amortization:
Pipeline space29.4$39.6 $29.5 $39.6 $29.7 
Intangible lease liability8.4(9.1)(5.6)(9.1)(5.8)
Total intangible assets subject to amortization30.5 23.9 30.5 23.9 
Intangible assets not subject to amortization, indefinite lives:
Trade name115.4 115.4 115.4 115.4 
Intangible assets, net of amortization$145.9 $139.3 $145.9 $139.3