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Other Intangible Assets, net (Tables)
 3 Months Ended
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of intangible assets, net
The following presents a summary of other intangible assets, net:
 
 
 
March 31, 2017 (unaudited)
 
December 31, 2016
(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
1.8
 
$
0.9

 
$
(0.9
)
 
$
—

 
$
0.9

 
$
(0.9
)
 
$
—

Trade names and trademarks
2.3
 
9.8

 
(9.6
)
 
0.2

 
9.8

 
(9.6
)
 
0.2

Proprietary know how
2.2
 
34.7

 
(34.6
)
 
0.1

 
34.7

 
(32.6
)
 
2.1

Management contract rights
11.6
 
81.0

 
(23.2
)
 
57.8

 
81.0

 
(22.0
)
 
59.0

Acquired intangible assets, net (2)
11.6
 
$
126.4

 
$
(68.3
)
 
$
58.1

 
$
126.4

 
$
(65.1
)
 
$
61.3


(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
 
 
Three Months Ended
(millions) (unaudited)
 
March 31, 2017
 
March 31, 2016
Amortization expense related to other intangible assets included in depreciation and amortization
 
$
3.2

 
$
3.8