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Retirement Plans | 3 Months Ended
--- | ---
Dec. 31, 2021
Retirement Benefits [Abstract] |
Retirement Plans | Retirement Plans The components of net periodic benefit cost for our pension plans are presented below.
| Three months ended |  |
| December 31, |  |
| 2021 |  | 2020 |  |  |  |
| (in millions)
Service cost | $ | 0.3 |  |  | $ | 0.4 |  |  |  |  |
Pension costs (benefits) other than service: |  |  |  |  |  |  |
Interest cost | 2.4 |  |  | 2.5 |  |  |  |  |
Expected return on plan assets | (3.8) |  |  | (3.9) |  |  |  |  |
Amortization of actuarial net loss | 0.4 |  |  | 0.6 |  |  |  |  |
Pension benefits other than service | (1.0) |  |  | (0.8) |  |  |  |  |
Net periodic benefit | $ | (0.7) |  |  | $ | (0.4) |  |  |  |  |
The amortization of actuarial losses, net of tax, is recorded as a component of other comprehensive income (loss).

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