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Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2015
Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets and Excess Reorganization Value [Table Text Block]
 
June 30,
2015
 
December 31,
2014
 
(millions)
Amortizable intangible assets:
 
 
 
Backlog
$
54.6

 
$
54.6

Customer relationships
68.9

 
68.9

Amortizable intangible assets, gross
$
123.5

 
$
123.5

Accumulated amortization
(10.3
)
 
(4.3
)
Amortizable intangible assets, net
$
113.2

 
$
119.2

 
 
 
 
Nonamortizable intangible assets:
 
 
 
Excess reorganizational value
$
137.2

 
$
137.2