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Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets and Excess Reorganization Value [Table Text Block]
Intangible asset balances are as follows (in millions):
 
June 30, 2019
 
December 31, 2018
 
 
 
 
 
 
 
 
 
 
 
 
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Amount
Sales order book
$
54.6

 
$
28.0

 
$
26.6

 
$
54.6

 
$
28.0

 
$
26.6

Customer relationships
68.9

 
21.8

 
47.1

 
68.9

 
19.5

 
49.4

Total
$
123.5

 
$
49.8

 
$
73.7

 
$
123.5

 
$
47.5

 
$
76.0