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Defined Benefit Plans | 3 Months Ended
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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.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration