Other Intangible Assets, net

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Other Intangible Assets, net

Other Intangible Assets, net

The following presents a summary of other intangible assets:

		December 31,
		2019							2018
(millions)	Weighted Average Life (Years)	Acquired Intangible Assets, Gross		Accumulated Amortization			Acquired Intangible Assets, Net		Acquired Intangible Assets, Gross		Accumulated Amortization			Acquired Intangible Assets, Net
Covenant not to compete	2.9	$	2.9	$	(0.3	)	$	2.6	$	1.6	$	—		$	1.6
Trade names and trademarks	3.9	5.6		(1.2		)	4.4		6.3		(0.7		)	5.6
Proprietary know how	4.7	10.4		(2.0		)	8.4		11.0		(0.8		)	10.2
Management contract rights	9.0	81.0		(37.4		)	43.6		81.0		(32.2		)	48.8
Customer relationships	13.9	100.4		(7.2		)	93.2		100.4		(0.6		)	99.8
Acquired intangible assets, net (1)	11.5	$	200.3	$	(48.1	)	$	152.2	$	200.3	$	(34.3	)	$	166.0

(1) Intangible assets have estimated remaining lives between 2 and 14 years.

The table below shows the amortization expense related to intangible assets for the years ended December 31, 2019, 2018 and 2017, and is included in Depreciation and amortization within the Consolidated Statements of Income.

	Year Ended December 31,
(millions)	2019		2018		2017
Amortization expense	$	15.1	$	6.1	$	7.2

The expected future amortization of intangible assets as of December 31, 2019 is as follows:

(millions)	Intangible asset amortization
2020	$	15.7
2021	15.7
2022	15.1
2023	14.9
2024	13.1
2025 and thereafter	77.7
Total	$	152.2