Other Intangible Assets, net (Tables)

3 Months Ended

Mar. 31, 2022

Goodwill And Intangible Assets Disclosure [Abstract]

Components of Intangible Assets, Net

The components of other intangible assets, net, as of March 31, 2022 (unaudited) and December 31, 2021, were as follows:

			March 31, 2022							December 31, 2021
(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		1.7	$	1.6	$	(1.1	)	$	0.5	$	2.9	$	(2.3	)	$	0.6
Trade names and trademarks		1.7		0.9		(0.5	)		0.4		0.9		(0.5	)		0.4
Proprietary know how		2.7		3.8		(1.5	)		2.3		3.8		(1.3	)		2.5
Management contract rights		7.0		81.0		(49.0	)		32.0		81.0		(47.7	)		33.3
Customer relationships		9.9		21.5		(5.1	)		16.4		21.5		(3.9	)		17.6
Other intangible assets, net		7.6	$	108.8	$	(57.2	)	$	51.6	$	110.1	$	(55.7	)	$	54.4

Summary of Amortization of Intangible Assets

Amortization expense related to intangible assets during the three months ended March 31, 2022 and 2021, (unaudited), respectively, which was included in Depreciation and amortization within the Condensed Consolidated Statements of Income, was as follows:

	Three Months Ended
(millions)	March 31, 2022		March 31, 2021
Amortization expense	$	2.8	$	2.1