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Retirement Benefit Plans
 3 Months Ended
Mar. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Retirement Benefit Plans
Retirement Benefit Plans

The Company has a number of defined benefit pension plans and other postretirement benefit plans covering eligible salaried and hourly employees and their dependents. The estimated contributions to the Company's defined benefit pension plans for 2014 range from $15.0 million to $25.0 million, of which $5.0 million has been contributed through the first three months of the year. The other postretirement 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-
retirement benefits
(millions of dollars)
 
2014
 
2013
 
2014
 
2013
Three Months Ended March 31,
 
US
 
Non-US
 
US
 
Non-US
 
 
Service cost
 
$
—

 
$
3.3

 
$
—

 
$
3.1

 
$
—

 
$
0.1

Interest cost
 
3.1

 
4.6

 
2.9

 
4.2

 
1.7

 
1.7

Expected return on plan assets
 
(4.4
)
 
(5.4
)
 
(4.6
)
 
(2.7
)
 
—

 
—

Amortization of unrecognized prior service benefit
 
(0.2
)
 
—

 
(0.2
)
 
—

 
(1.6
)
 
(1.6
)
Amortization of unrecognized loss
 
1.6

 
1.2

 
2.1

 
1.3

 
0.7

 
1.2

Net periodic benefit cost
 
$
0.1

 
$
3.7

 
$
0.2

 
$
5.9

 
$
0.8

 
$
1.4