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Restructuring and Acquisition-Related Costs (Tables)
 3 Months Ended
Mar. 31, 2018
Restructuring and Related Activities [Abstract]  
Restructuring and Related Costs [Table Text Block]
In 2016, AAM initiated actions under a global restructuring program focused on creating a more streamlined organization in addition to reducing our cost structure and preparing for acquisition integration activities. A summary of this activity for the first three months of 2018 and 2017 is shown below:
 
Severance Charges
 
Implementation Costs
 
Total
 
(in millions)
Accrual as of December 31, 2016
$
0.6

 
$
9.2

 
$
9.8

Charges
1.2

 
5.6

 
6.8

Cash utilization
(1.1
)
 
(1.5
)
 
(2.6
)
Accrual as of March 31, 2017
$
0.7

 
$
13.3

 
$
14.0

 
 
 
 
 
 
Accrual as of December 31, 2017
$
0.3

 
$
—

 
$
0.3

Charges
0.2

 
3.9

 
4.1

Cash utilization
(0.4
)
 
(0.5
)
 
(0.9
)
Accrual as of March 31, 2018
$
0.1

 
$
3.4

 
$
3.5
Business Combination, Separately Recognized Transactions [Table Text Block]
2017, we completed the acquisitions of Metaldyne Performance Group, Inc. (MPG) and USM Mexico Manufacturing LLC (USM Mexico). During the three months ended March 31, 2018, we incurred the following charges related to these acquisitions:
 
Acquisition-Related Costs
 
Integration Expenses
 
Total
 
(in millions)
Charges
$
1.1

 
$
13.1

 
$
14.2

 
 
 
 
 
 
Total restructuring and acquisition-related charges
$
18.3