Other Intangible Assets, net

6 Months Ended

Jun. 30, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Other Intangible Assets, net

6. Other Intangible Assets, net

The components of other intangible assets, net, as of June 30, 2023 (unaudited) and December 31, 2022, were as follows:

			June 30, 2023							December 31, 2022
(millions)	Weighted Average Life (Years)		Intangible Assets, Gross		Accumulated Amortization			Intangible Assets, Net		Intangible Assets, Gross		Accumulated Amortization			Intangible Assets, Net
Covenant not to compete		3.4	$	2.9	$	(1.8	)	$	1.1	$	2.9	$	(1.4	)	$	1.5
Trade names and trademarks		12.0		3.0		(0.9	)		2.1		2.8		(0.7	)		2.1
Proprietary know how		6.4		22.0		(4.4	)		17.6		21.7		(2.7	)		19.0
Management contract rights		6.0		81.0		(55.4	)		25.6		81.0		(52.9	)		28.1
Customer relationships		8.1		24.9		(7.8	)		17.1		24.8		(6.6	)		18.2
Other intangible assets, net		6.8	$	133.8	$	(70.3	)	$	63.5	$	133.2	$	(64.3	)	$	68.9

Amortization expense related to other intangible assets during the three and six months ended June 30, 2023 and 2022, (unaudited), respectively, which was included in Depreciation and amortization within the Condensed Consolidated Statements of Income, was as follows:

	Three Months Ended				Six Months Ended
(millions)	June 30, 2023		June 30, 2022		June 30, 2023		June 30, 2022
Amortization expense	$	3.0	$	2.1	$	6.0	$	4.9