Other Intangible Assets, net (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill And Intangible Assets Disclosure [Abstract]

The components of other intangible assets, net, for the years ended December 31, 2020 and 2019 were as follows:

			December 31,
			2020							2019
	Weighted		Acquired					Acquired		Acquired					Acquired
	Average		Intangible					Intangible		Intangible					Intangible
	Life		Assets,		Accumulated			Assets,		Assets,		Accumulated			Assets,
(millions)	(Years)		Gross		Amortization			Net		Gross		Amortization			Net
Covenant not to compete		2.1	$	2.9	$	(1.3	)	$	1.6	$	2.9	$	(0.3	)	$	2.6
Trade names and trademarks		2.9		0.9		(0.2	)		0.7		5.6		(1.2	)		4.4
Proprietary know how		3.7		3.8		(0.4	)	$	3.4		10.4		(2.0	)		8.4
Management contract rights		8.1		81.0		(42.6	)		38.4		81.0		(37.4	)		43.6
Customer relationships		12.9		21.5		(2.5	)	$	19.0		100.4		(7.2	)		93.2
Acquired intangible assets, net		9.1	$	110.1	$	(47.0	)	$	63.1	$	200.3	$	(48.1	)	$	152.2

Summary of Amortization of Intangible Assets

The table below shows the amortization expense related to intangible assets for the years ended December 31, 2020, 2019 and 2018, which was included in Depreciation and amortization within the Consolidated Statements of (Loss) Income.

	Year Ended December 31,
(millions)	2020		2019		2018
Amortization expense	$	13.2	$	15.1	$	6.1

Schedule of Expected Future Amortization of Intangible Assets

The expected future amortization of intangible assets as of December 31, 2020 was as follows:

(millions)	Intangible asset amortization
2021	$	8.7
2022		8.1
2023		8.0
2024		7.3
2025		6.6
2026 and thereafter		24.4
Total	$	63.1