Other Intangible Assets, net

9 Months Ended

Sep. 30, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

6. Other Intangible Assets, net

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


			September 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
Management contract rights		5.8	$	81.0	$	(56.7	)	$	24.3	$	81.0	$	(52.9	)	$	28.1
Proprietary know how		6.5		23.8		(5.2	)		18.6		21.7		(2.7	)		19.0
Customer relationships		7.8		25.0		(8.3	)		16.7		24.8		(6.6	)		18.2
Trade names and trademarks		12.3		2.9		(1.1	)		1.8		2.8		(0.7	)		2.1
Covenant not to compete		3.5		2.9		(2.0	)		0.9		2.9		(1.4	)		1.5
Other intangible assets, net		6.7	$	135.6	$	(73.3	)	$	62.3	$	133.2	$	(64.3	)	$	68.9

Amortization expense related to other intangible assets during the three and nine months ended September 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				Nine Months Ended
(millions)	September 30, 2023		September 30, 2022		September 30, 2023		September 30, 2022
Amortization expense	$	3.0	$	2.1	$	9.0	$	7.0