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Intangible Assets, net (Tables)
 6 Months Ended
Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of intangible assets, net
The following table presents a summary of intangible assets, net:
 
 
 
June 30, 2016 (unaudited)
 
December 31, 2015
(millions)
Weighted
Average
Life (in
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
2.5
 
$
0.9

 
$
(0.9
)
 
$
—

 
$
0.9

 
$
(0.9
)
 
$
—

Trade names and trademarks
1.0
 
9.8

 
(9.0
)
 
0.8

 
9.8

 
(7.8
)
 
2.0

Proprietary know how
0.8
 
34.7

 
(28.8
)
 
5.9

 
34.7

 
(25.0
)
 
9.7

Management contract rights
12.4
 
81.0

 
(19.4
)
 
61.6

 
81.0

 
(16.8
)
 
64.2

Acquired intangible assets, net (2)
11.2
 
$
126.4

 
$
(58.1
)
 
$
68.3

 
$
126.4

 
$
(50.5
)
 
$
75.9

(1)  Excludes the original cost and accumulated amortization of fully amortized intangible assets.
(2)  Intangible assets have estimated useful lives between one and nineteen years.
Summary of amortization of intangible assets
The following table presents the Company's amortization expense related to intangible assets included in depreciation and amortization expense:
 
Three Months Ended
 
Six Months Ended
(millions) (unaudited)
June 30, 2016
 
June 30, 2015
 
June 30, 2016
 
June 30, 2015
Amortization expense related to intangible assets included in depreciation and amortization expense
$
3.8

 
$
3.8

 
$
7.6

 
$
7.6