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Retirement Benefit Plans
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [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 2018 range from $15.0 million to $25.0 million, of which $12.3 million has been contributed through the first nine 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 postretirement
employee benefits
(in millions)
 
2018
 
2017
 
Three Months Ended September 30,
 
US
 
Non-US
 
US
 
Non-US
 
2018
 
2017
Service cost
 
$
—

 
$
4.4

 
$
—

 
$
4.5

 
$
0.1

 
$
—

Interest cost
 
2.1

 
3.0

 
2.2

 
2.8

 
0.7

 
0.8

Expected return on plan assets
 
(3.4
)
 
(6.7
)
 
(3.3
)
 
(6.0
)
 
—

 
—

Amortization of unrecognized prior service credit
 
(0.2
)
 
—

 
(0.2
)
 
—

 
(1.1
)
 
(1.1
)
Amortization of unrecognized loss
 
1.0

 
1.7

 
1.1

 
2.0

 
0.3

 
0.4

Net periodic benefit (income) cost
 
$
(0.5
)
 
$
2.4

 
$
(0.2
)
 
$
3.3

 
$
—

 
$
0.1

 
 
Pension benefits
 
Other postretirement
employee benefits
(in millions)
 
2018
 
2017
 
Nine Months Ended September 30,
 
US
 
Non-US
 
US
 
Non-US
 
2018
 
2017
Service cost
 
$
—

 
$
13.5

 
$
—

 
$
13.3

 
$
0.1

 
$
0.1

Interest cost
 
6.4

 
9.1

 
6.6

 
8.0

 
2.1

 
2.4

Expected return on plan assets
 
(10.3
)
 
(20.6
)
 
(9.8
)
 
(17.4
)
 
—

 
—

Amortization of unrecognized prior service credit
 
(0.6
)
 
—

 
(0.6
)
 
—

 
(3.1
)
 
(3.1
)
Amortization of unrecognized loss
 
3.1

 
5.3

 
3.2

 
5.8

 
0.9

 
1.0

Net periodic benefit (income) cost
 
$
(1.4
)
 
$
7.3

 
$
(0.6
)
 
$
9.7

 
$
—

 
$
0.4



The components of net periodic benefit cost other than the service cost component are included in Other postretirement income in the Condensed Consolidated Statements of Operations.