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Net Periodic Benefit Cost - Defined Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2018
Notes To Financial Statements [Abstract]  
Components of Net Periodic Benefit Cost
Following are the components of net periodic pension (benefit) expense for the three months ended March 31, 2018 and April 1, 2017:
 
Year-to-Date
 
Pension Benefits
 
Other Benefits
 
U.S. Plans
 
Non-U.S. Plans
 
All Plans
(Millions of Dollars)
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Service cost
$
1.8

 
$
2.3

 
$
3.9

 
$
3.3

 
$
0.1

 
$
0.1

Interest cost
10.4

 
10.7

 
7.5

 
7.0

 
0.4

 
0.4

Expected return on plan assets
(16.8
)
 
(16.1
)
 
(12.2
)
 
(11.0
)
 
—

 
—

Amortization of prior service cost (credit)
0.2

 
0.3

 
(0.4
)
 
(0.3
)
 
(0.3
)
 
(0.3
)
Amortization of net loss
1.9

 
1.9

 
2.4

 
2.3

 
—

 
—

Settlement / curtailment loss
—

 
—

 
0.1

 
12.5

 
—

 
—

Net periodic pension (benefit) expense
$
(2.5
)
 
$
(0.9
)
 
$
1.3

 
$
13.8

 
$
0.2

 
$
0.2


In accordance with the adoption of ASU 2017-07, the components of net periodic benefit cost other than the service cost component are included in Other, net in the Consolidated Statements of Operations and Comprehensive Income. 
In March 2017, a pre-tax charge of $12.5 million was recorded, reflecting losses previously reported in accumulated other comprehensive loss related to a non-U.S. pension plan for which the Company settled its obligation by purchasing an annuity and making lump sum payments to participants.