Other Intangible Assets, net (Tables)

6 Months Ended

Jun. 30, 2020

Goodwill And Intangible Assets Disclosure [Abstract]

Summary of Intangible Assets, Net

The components of other intangible assets, net, at June 30, 2020 and December 31, 2019 were as follows:

			June 30, 2020 (unaudited)							December 31, 2019
(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		2.5	$	2.9	$	(0.8	)	$	2.1	$	2.9	$	(0.3	)	$	2.6
Trade names and trademarks		3.4		5.6		(1.8	)		3.8		5.6		(1.2	)		4.4
Proprietary know how		4.2		6.7		(2.8	)		3.9		10.4		(2.0	)		8.4
Management contract rights		8.6		81.0		(40.0	)		41.0		81.0		(37.4	)		43.6
Customer relationships		13.4		100.4		(10.5	)		89.9		100.4		(7.2	)		93.2
Acquired intangible assets, net (1)		11.1	$	196.6	$	(55.9	)	$	140.7	$	200.3	$	(48.1	)	$	152.2

(1)  Intangible assets have estimated remaining lives between one and fourteen years.

Summary of Amortization of Intangible Assets

The table below shows the amortization expense related to intangible assets for the three and six months ended June 30, 2020 and 2019, respectively, and is included in Depreciation and amortization within the Condensed Consolidated Statements of Income:

	Three Months Ended				Six Months Ended
(millions) (unaudited)	June 30, 2020		June 30, 2019		June 30, 2020		June 30, 2019
Amortization expense	$	3.9	$	3.8	$	7.8	$	7.6