Other Intangible Assets, net (Tables)

3 Months Ended

Mar. 31, 2021

Goodwill And Intangible Assets Disclosure [Abstract]

Components of Intangible Assets, Net

The components of other intangible assets, net, at March 31, 2021 (unaudited) and December 31, 2020 were as follows:

			March 31, 2021							December 31, 2020
(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		2.0	$	2.9	$	(1.5	)	$	1.4	$	2.9	$	(1.3	)	$	1.6
Trade names and trademarks		2.7		0.9		(0.3	)		0.6		0.9		(0.2	)		0.7
Proprietary know how		3.4		3.8		(0.6	)		3.2		3.8		(0.4	)		3.4
Management contract rights		7.9		81.0		(43.9	)		37.1		81.0		(42.6	)		38.4
Customer relationships		12.7		21.5		(2.8	)		18.7		21.5		(2.5	)		19.0
Other intangible assets, net		8.9	$	110.1	$	(49.1	)	$	61.0	$	110.1	$	(47.0	)	$	63.1

Summary of Amortization of Intangible Assets

Amortization expense related to intangible assets for the three months ended March 31, 2021 and 2020 (unaudited), respectively, which was included in Depreciation and amortization within the Condensed Consolidated Statements of Income (Loss), was as follows:

	Three Months Ended
(millions)	March 31, 2021		March 31, 2020
Amortization expense	$	2.1	$	3.9