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Pensions and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Components of net annual benefit cost (income)
The following table summarizes the components of net annual benefit cost (income):
(in Millions)
Three Months Ended September 30,
 
Nine Months Ended September 30,
Pensions
 
Other Benefits
 
Pensions
 
Other Benefits
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Service cost
$
1.1

 
$
1.8

 
$
—

 
$
—

 
$
4.3

 
$
5.6

 
$
—

 
$
—

Interest cost
9.9

 
11.2

 
0.2

 
0.1

 
32.7

 
33.7

 
0.5

 
0.5

Expected return on plan assets
(15.9
)
 
(19.9
)
 
—

 
—

 
(47.5
)
 
(59.6
)
 
—

 
—

Amortization of prior service cost (credit)
0.1

 
0.1

 
(0.1
)
 
—

 
0.3

 
0.4

 
(0.1
)
 
—

Recognized net actuarial and other (gain) loss
4.5

 
4.1

 
—

 
(0.3
)
 
12.8

 
11.9

 
(0.4
)
 
(0.8
)
Recognized loss due to settlement (1)
0.1

 
1.2

 
—

 
—

 
1.4

 
2.0

 
—

 
—

Net periodic benefit cost (income)
$
(0.2
)
 
$
(1.5
)
 
$
0.1

 
$
(0.2
)
 
$
4.0

 
$
(6.0
)
 
$
—

 
$
(0.3
)

____________________
(1)
Settlement charge relates to the U.S. nonqualified defined benefit pension plan.