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Retirement Benefit Plans
 6 Months Ended
Jun. 30, 2012
Compensation and Retirement Disclosure [Abstract]  
Retirement Benefit Plans
Retirement Benefit Plans
The Company has a number of defined benefit pension plans and other post employment benefit plans covering eligible salaried and hourly employees and their dependents. The estimated contributions to the Company's defined benefit pension plans for 2012 range from $30 million to $40 million, of which $9.1 million has been contributed through the first six months of the year. Included in the Company's estimated 2012 contributions is $15 million related to the Company's March 24, 2010 settlement agreement with the Pension Benefit Guaranty Corporation regarding the closure of the Company's BorgWarner Diversified Transmission Products Plant in Muncie, Indiana. The Company anticipates making the $15 million required contribution in December of 2012. The other post employment benefit plans, which provide medical and life insurance benefits, are unfunded plans.

The components of net periodic benefit cost recorded in the Condensed Consolidated Statements of Operations are as follows:
 
Pension benefits
 
Other post
employment benefits
(millions of dollars)
2012
 
2011
 
2012
 
2011
Three Months Ended June 30,
US
 
Non-US
 
US
 
Non-US
 
 
Service cost
$
—

 
$
2.3

 
$
—

 
$
2.7

 
$
0.2

 
$
0.1

Interest cost
3.6

 
4.3

 
4.1

 
4.4

 
2.5

 
3.0

Expected return on plan assets
(4.7
)
 
(2.3
)
 
(5.2
)
 
(2.9
)
 
—

 
—

Amortization of unrecognized prior service benefit
(0.2
)
 
—

 
(0.3
)
 
—

 
(1.6
)
 
(1.7
)
Amortization of unrecognized loss
2.1

 
0.2

 
1.6

 
0.2

 
1.7

 
2.0

Net periodic benefit cost
$
0.8

 
$
4.5

 
$
0.2

 
$
4.4

 
$
2.8

 
$
3.4



 
Pension benefits
 
Other post
employment benefits
(millions of dollars)
2012
 
2011
 
2012
 
2011
Six Months Ended June 30,
US
 
Non-US
 
US
 
Non-US
 
 
Service cost
$
—

 
$
4.6

 
$
—

 
$
5.2

 
$
0.3

 
$
0.3

Interest cost
7.2

 
8.7

 
8.1

 
9.0

 
5.1

 
5.9

Expected return on plan assets
(9.4
)
 
(4.6
)
 
(10.4
)
 
(5.7
)
 
—

 
—

Amortization of unrecognized prior service benefit
(0.4
)
 
—

 
(0.4
)
 
—

 
(3.2
)
 
(3.4
)
Amortization of unrecognized loss
4.1

 
0.5

 
3.2

 
0.4

 
3.4

 
4.0

Net periodic benefit cost
$
1.5

 
$
9.2

 
$
0.5

 
$
8.9

 
$
5.6

 
$
6.8