Other Intangible Assets

12 Months Ended

Dec. 31, 2022

Goodwill and Intangible Assets Disclosure [Abstract]

Other Intangible Assets

Other Intangible Assets

A summary of our identifiable intangible assets are as follows (in millions):

As of December 31, 2022	Useful Life	Gross		Accumulated Amortization		Net
Intangible Assets subject to amortization:
Third-party fuel supply agreement	10 years	$	49.0	$	(26.9)	$	22.1
Fuel trade name	5 years	4.0		(4.0)		—
Rights-of-way	8 - 35 years	13.5		(0.4)		13.1
Customer relationships	11.6 years	210.0		(10.6)		199.4
Intangible assets not subject to amortization:
Rights-of-way	Indefinite	58.4				58.4
Line space history	Indefinite	12.0				12.0
Liquor licenses	Indefinite	8.5				8.5
Refinery permits	Indefinite	2.1				2.1
Total		$	357.5	$	(41.9)	$	315.6

As of December 31, 2021	Useful Life	Gross		Accumulated Amortization		Net
Intangible Assets subject to amortization:
Third-party fuel supply agreement	10 years	$	49.0	$	(22.1)	$	26.9
Fuel trade name	5 years	4.0		(3.6)		0.4
Intangible assets not subject to amortization:
Rights-of-way	Indefinite	52.8				52.8
Line space history	Indefinite	12.0				12.0
Liquor licenses	Indefinite	8.5				8.5
Refinery permits	Indefinite	2.1				2.1
Total		$	128.4	$	(25.7)	$	102.7

Amortization of intangible assets was $16.2 million, $5.7 million and $5.7 million during the years ended December 31, 2022, 2021 and 2020, respectively, and is included in depreciation and amortization on the accompanying consolidated statements of income.

Amortization expense for the next five years is estimated to be as follows (in millions):

2023	$	23.6
2024	$	23.6
2025	$	23.6
2026	$	23.6
2027	$	23.6