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Other Intangible Assets, Net
 12 Months Ended
Dec. 31, 2016
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,
 
 
 
2016
 
2015
(millions)
Weighted
Average
Life
(Years)
 
Acquired
Intangible
Assets,
Gross (1)
 
Accumulated
Amortization
 
Acquired
Intangible
Assets,
Net
 
Acquired
Intangible
Assets,
Gross(1)
 
Accumulated
Amortization
 
Acquired
Intangible
Assets,
Net
Covenant not to compete
2.0
 
$
0.9

 
$
(0.9
)
 
$
—

 
$
0.9

 
$
(0.9
)
 
$
—

Trade names and trademarks
2.5
 
9.8

 
(9.6
)
 
0.2

 
9.8

 
(7.8
)
 
2.0

Proprietary know how
0.4
 
34.7

 
(32.6
)
 
2.1

 
34.7

 
(25.0
)
 
9.7

Management contract rights
11.9
 
81.0

 
(22.0
)
 
59.0

 
81.0

 
(16.8
)
 
64.2

Acquired intangible assets, net (2)
11.5
 
$
126.4

 
$
(65.1
)
 
$
61.3

 
$
126.4

 
$
(50.5
)
 
$
75.9


(1) Excludes the original cost and accumulated amortization on fully amortized intangible assets.
(2) Intangible assets have estimated remaining lives between one and 15 years.
Amortization expense related to intangible assets included in depreciation and amortization expense was $14.6 million, $15.1 million and $15.2 million for the years ended December 31, 2016, 2015 and 2014, respectively. The expected future amortization of intangible assets as of December 31, 2016 is as follows:
(millions)
Intangible asset
amortization
2017
$
7.2

2018
5.3

2019
5.2

2020
5.2

2021
5.2

2022 and Thereafter
33.2

Total
$
61.3