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Goodwill and Intangible Assets Schedule of Goodwill (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill [Line Items]  
Schedule of Goodwill [Table Text Block]
Goodwill The following table provides a reconciliation of changes in goodwill for the year ended December 31, 2017 and the year ended December 31, 2016:

 
Driveline
 
Metal Forming
 
Powertrain
 
Casting
 
Consolidated
 
(in millions)
Balance as of January 1, 2016
$
130.5

 
$
23.9

 
$
—

 
$
—

 
$
154.4

Foreign currency translation
(0.4
)
 
—

 
—

 
—

 
(0.4
)
Balance as of December 31, 2016
$
130.1


$
23.9


$
—


$
—

 
$
154.0

Acquisition of MPG
—

 
515.3

 
471.6

 
405.5

 
1,392.4

Acquisition of USM Mexico
80.4

 
—

 
—

 
—

 
80.4

Foreign currency translation
0.6

 
19.7

 
7.2

 
—

 
27.5

Balance as of December 31, 2017
$
211.1

 
$
558.9

 
$
478.8

 
$
405.5

 
$
1,654.3