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Defined Benefit and Postretirement Benefits
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Defined Benefit and Postretirement Benefits Defined Benefit and Postretirement Benefits
For all plans, the components of net periodic (benefit) cost for the three months ended September 30, 2019 and 2018 are as follows:
 
Pension
 
Postretirement
 
SERP
(in millions)
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Service cost
$
1.4

 
$
1.5

 
$
0.2

 
$
0.1

 
$
—

 
$
—

Interest cost
9.1

 
7.5

 
0.8

 
0.2

 
—

 
0.1

Expected return on plan assets
(11.6
)
 
(16.4
)
 
—

 
—

 
—

 
—

Amortization of prior service cost
0.1

 
(0.1
)
 
(0.8
)
 
—

 
—

 
—

Amortization of net loss (gain)
4.8

 
3.6

 
(0.2
)
 
(0.3
)
 
—

 
—

Net periodic cost (benefit)
$
3.8

 
$
(3.9
)
 
$
—

 
$
—

 
$
—

 
$
0.1


For all plans, the components of net periodic (benefit) cost for the nine months ended September 30, 2019 and 2018 are as follows:
 
Pension
 
Postretirement
 
SERP
(in millions)
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Service cost
$
4.1

 
$
4.5

 
$
0.2

 
$
0.2

 
$
—

 
$
—

Interest cost
24.5

 
22.5

 
0.8

 
0.8

 
0.1

 
0.1

Expected return on plan assets
(40.2
)
 
(49.1
)
 
—

 
—

 
—

 
—

Amortization of prior service cost
(0.3
)
 
(0.4
)
 
(0.8
)
 
—

 
—

 
—

Amortization of net loss (gain)
11.5

 
10.7

 
(0.2
)
 
(0.9
)
 
(0.1
)
 
—

Net periodic (benefit) cost
$
(0.4
)
 
$
(11.8
)
 
$
—

 
$
0.1

 
$
—

 
$
0.1


Effective January 1, 2018, the components of net periodic (benefit) cost other than the service cost component are included in “Miscellaneous (expense) income, net” in our Condensed Consolidated Statements of Operations. Service cost is recorded within “Cost of sales” and “Selling, general and administrative” in our Condensed Consolidated Statements of Operations.

We expect, based on current actuarial calculations, to contribute the following to our pension plans, postretirement plans and Supplemental Executive Retirement Plan (“SERP”):
(in millions)
Pension
 
Postretirement
 
SERP
Expected contributions in 2019
$
3.1

 
$
2.5

 
$
2.2

Amounts contributed during the nine months ended September 30, 2019
$
2.4

 
$
1.4

 
$
2.2