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Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

(Millions of dollars)						March 31, 2025						December 31, 2024
Goodwill						$	328.0					$	328.0

Schedule of Intangible Assets Subject to Amortization

Intangible assets subject to amortization at March 31, 2025 and December 31, 2024 consisted of the following:

			Remaining Useful Life (in years)						March 31, 2025												December 31, 2024
(Millions of dollars)									Cost						Net						Cost						Net
Intangible assets subject to amortization:
Pipeline space			30.4						$	39.6					$	30.4					$	39.6					$	30.7
Intangible lease liability			9.2						(9.1)						(6.3)						(9.1)						(6.6)
Total intangible assets subject to amortization									30.5						24.1						30.5						24.1
Intangible assets not subject to amortization, indefinite lives:
Trade name									115.4						115.4						115.4						115.4
Intangible assets, net of amortization									$	145.9					$	139.5					$	145.9					$	139.5

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Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

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