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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2014
Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets and Excess Reorganization Value [Table Text Block]
 
Successor
($ millions)
September 30,
2014
 
Accumulated Amortization
 
December 31,
2014
 
 
 
 
 
 
Amortizable intangible assets:
 
 
 
 
 
Backlog
$
54.6

 
$
(3.2
)
 
$
51.4

Customer relationships
68.9

 
(1.1
)
 
67.8

Total
$
123.5

 
$
(4.3
)
 
$
119.2

 
 
 
 
 
 
Nonamortizable intangible assets:
 
 
 
 
 
Excess reorganizational value
$
137.2

 
 
 
$
137.2
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
The amount of amortization expense for intangible assets in each of the succeeding years is estimated to be as follows (in millions):
2015
$
12.6

2016
12.4

2017
10.4

2018
9.7

2019
9.6

Thereafter
64.5

 
$
119.2