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Intangible Assets, net
 3 Months Ended
Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, net
Intangible Assets, net
 
The following presents a summary of intangible assets, net:
 
 
 
March 31, 2016 (unaudited)
 
December 31, 2015
(millions)
Weighted
Average
Life (in
Years)
 
Acquired
Intangibled
Assets,
Gross (1)
 
Accumulated
Amortization
 
Acquired
Intangible
Assets,
Net
 
Acquired
Intangible
Assets,
Gross (1)
 
Accumulated
Amortization
 
Acquired
Intangible
Assets,
Net
Covenant not to compete
2.8
 
$
0.9

 
$
(0.9
)
 
$
—

 
$
0.9

 
$
(0.9
)
 
$
—

Trade names and trademarks
0.9
 
9.8

 
(8.4
)
 
1.4

 
9.8

 
(7.8
)
 
2.0

Proprietary know how
1.1
 
34.7

 
(26.9
)
 
7.8

 
34.7

 
(25.0
)
 
9.7

Management contract rights
12.6
 
81.0

 
(18.1
)
 
62.9

 
81.0

 
(16.8
)
 
64.2

Acquired intangible assets, net (2)
11.1
 
$
126.4

 
$
(54.3
)
 
$
72.1

 
$
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.
 
 
Three Months Ended
(millions)
 
March 31, 2016
 
March 31, 2015
Amortization expense related to intangible assets included in depreciation and amortization
 
$
3.8

 
$
3.8