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Restructuring
 6 Months Ended
Jun. 30, 2018
Restructuring and Related Activities [Abstract]  
Restructuring
Restructuring

In the third quarter of 2017, the Company initiated actions within its emissions business in the Engine segment designed to improve future profitability and competitiveness and started exploring strategic options for the non-core emission product lines. As a continuation of these actions, the Company recorded restructuring expense of $28.1 million and $32.9 million during the three and six months ended June 30, 2018, respectively, primarily related to professional fees and employee termination benefits. In the second quarter of 2018, the Company initiated a voluntary termination program in the European emissions business and approximately 140 employees accepted the voluntary termination packages. As a result, the Company recorded approximately $25.3 million of employee severance expense during the three months ended June 30, 2018. The Company will continue its plan to improve the future profitability and competitiveness of its remaining European emissions business in the Engine segment. These actions may result in the recognition of additional restructuring charges that could be material.

Additionally, the Company recorded restructuring expense of $3.2 million and $5.5 million in the three and six months ended June 30, 2018, respectively, in the Drivetrain segment primarily related to manufacturing footprint rationalization activities.

Estimates of restructuring expense are based on information available at the time such charges are recorded. Due to the inherent uncertainty involved in estimating restructuring expenses, actual amounts paid for such activities may differ from amounts initially recorded. Accordingly, the Company may record revisions of previous estimates by adjusting previously established accruals.

The following tables display a rollforward of the severance accruals recorded within the Company's Condensed Consolidated Balance Sheet and the related cash flow activity for the three and six months ended June 30, 2018 and 2017:
 
 
Severance Accruals
(in millions)
 
Drivetrain
 
Engine
 
Total
Balance at December 31, 2017
 
$
4.1

 
$
1.3

 
$
5.4

Provision
 
1.1

 
0.7

 
1.8

Cash payments
 
(0.6
)
 
(1.1
)
 
(1.7
)
Translation adjustment
 
0.1

 
—

 
0.1

Balance at March 31, 2018
 
$
4.7

 
$
0.9

 
$
5.6

Provision
 
1.7

 
25.4

 
27.1

Cash payments
 
(1.3
)
 
(4.8
)
 
(6.1
)
Translation adjustment
 
(0.1
)
 
—

 
(0.1
)
Balance at June 30, 2018
 
$
5.0

 
$
21.5

 
$
26.5



 
 
Severance Accruals
(in millions)
 
Drivetrain
 
Engine
 
Total
Balance at December 31, 2016
 
$
3.7

 
$
2.7

 
$
6.4

Cash payments
 
(1.6
)
 
(2.1
)
 
(3.7
)
Translation adjustment
 
—

 
0.1

 
0.1

Balance at March 31, 2017
 
$
2.1

 
$
0.7

 
$
2.8

Cash payments
 
(0.2
)
 
(0.4
)
 
(0.6
)
Translation adjustment
 
0.1

 
—

 
0.1

Balance at June 30, 2017
 
$
2.0

 
$
0.3

 
$
2.3