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Defined Benefit Plans | 3 Months Ended
--- | ---
Mar. 31, 2021
Compensation And Retirement Disclosure [Abstract] |
Defined Benefit Plans |
1 1. | Defined Benefit Plans
The components of net periodic benefit income for pension for the three months ended March 31, 2021 and 2020 were as follows:
(In millions) |  | Three Months Ended March 31, |
|  | Pension Benefits |
|  | 2021 |  |  | 2020 |
Service cost |  | $ | 0.1 |  |  | $ | 0.1 |
Interest cost |  |  | 6.0 |  |  |  | 7.1 |
Expected return on plan assets |  |  | (8.7 | ) |  |  | (8.2 | )
Net periodic benefit income |  | $ | (2.6 | ) |  | $ | (1.0 | )
Service cost relates to benefit accruals in an hourly Union defined benefit plan in our Outdoors & Security segment. All other defined benefit pension plans were frozen as of December 31, 2016.

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