v3.26.1
Goodwill and Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2026
Intangible Asset, Goodwill and Other [Abstract]  
Schedule of Changes in Goodwill
(Millions of dollars)June 30,
2026		December 31,
2025
Goodwill$328.0 $328.0 
Schedule of Intangible Assets Subject to Amortization
Intangible assets subject to amortization at June 30, 2026 and December 31, 2025 consisted of the following:

Remaining Useful Life (in years)June 30, 2026December 31, 2025
(Millions of dollars)CostNetCostNet
Intangible assets subject to amortization:
Pipeline space29.2$39.6 $29.2 $39.6 $29.7 
Intangible lease liability8.3(9.1)(5.4)(9.1)(5.8)
Total intangible assets subject to amortization30.5 23.8 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 $139.2 $145.9 $139.3