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Defined Benefit Plans
 3 Months Ended
Mar. 31, 2019
Defined Benefit Plans
12.
Defined Benefit Plans
The components of net periodic benefit cost for pension and postretirement benefits for the three months ended March 31, 2019 and 2018 were as follows:
 
 
 
Three Months Ended March 31,
 
 
 
Pension Benefits
 
 
Postretirement Benefits
 
(In millions)
 
 
2019
 
 
2018
 
 
2019
 
 
2018
 
Service cost
 
$
0.1
 
 
$
0.2
 
 
$
—
 
 
$
—
 
Interest cost
 
 
8.2
 
 
 
7.6
 
 
 
—
 
 
 
—
 
Expected return on plan assets
 
 
(8.8
)
 
 
(10.3
)
 
 
—
 
 
 
—
 
Net periodic benefit income
 
$
(0.5
)
 
$
(2.5
)
 
$
—
 
 
$
—
 
Service cost relates to benefit accruals in an hourly Union defined benefit plan in our Doors & Security segment. All other defined benefit pension plans were frozen as of December 31, 2016.