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Goodwill and Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
(Millions of dollars)September 30,
2023		December 31,
2022
Goodwill$328.0 $328.0 
Schedule of Intangible Assets Subject to Amortization
Intangible assets subject to amortization at September 30, 2023 and December 31, 2022 consisted of the following:

Remaining Useful Life (in years)September 30, 2023December 31, 2022
(Millions of dollars)CostNetCostNet
Intangible assets subject to amortization:
Pipeline space31.9$39.6 $31.9 $39.6 $32.7 
Intangible lease liability10.7(9.1)(7.4)(9.1)(7.9)
Total intangible assets subject to amortization30.5 24.5 30.5 24.8 
Intangible assets not subject to amortization, indefinite lives:
Trade name115.4 115.4 115.4 115.4 
Liquor licenses— — 0.2 0.2 
Total intangible assets not subject to amortization115.4 115.4 115.6 115.6 
Intangible assets, net of amortization$145.9 $139.9 $146.1 $140.4