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Intangible Assets and Goodwill (Tables)
 3 Months Ended
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Carrying amount of intangible assets
The following table summarizes the carrying amount of intangible assets as of March 31, 2017 and December 31, 2016: 
 
As of
 
March 31, 2017
 
December 31, 2016
 
(Dollars in millions)
Acquired contractual rights
$
74.9

 
$
74.1

Acquired trademarks
1.1

 
1.0

Accumulated amortization
(46.1
)
 
(43.2
)
Finite-lived intangible assets, net
29.9

 
31.9

Goodwill(1)
10.2

 
10.1

Intangible assets, net
$
40.1

 
$
42.0


        
(1) Changes in the carrying amount of goodwill is due to foreign currency translation.
Summary of expected amortization expense
The following table summarizes the expected amortization expense for April 1, 2017 through December 31, 2021 (Dollars in millions): 
2017
$
7.5

2018
9.1

2019
5.3

2020
5.3

2021
2.7

 
$
29.9