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Goodwill and Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Components of Intangible Assets
The weighted average remaining useful life, gross carrying amount, and accumulated amortization of our intangible assets were as follows (dollars in millions):
 
September 30, 2015
 
December 31, 2014
 
Weighted Average Remaining Useful Life (in Years)
 
Gross 
Carrying
Amount
 
Accumulated
Amortization
 
Weighted Average Remaining Useful Life (in Years)
 
Gross 
Carrying
Amount
 
Accumulated
Amortization
Customer relationships
13.5
 
$
311.5

 
$
52.2

 
14.3
 
$
311.5

 
$
36.9

Trademarks and trade names
12.8
 
21.8

 
4.7

 
13.4
 
21.8

 
3.0

Other
1.5
 
0.2

 
0.2

 
2.2
 
0.2

 
0.1

Total intangible assets (excluding goodwill)
13.5
 
$
333.5

 
$
57.1

 
14.2
 
$
333.5

 
$
40.0