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Retirement Plans | 9 Months Ended
--- | ---
Jun. 30, 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 |  | Nine months ended |  |
| June 30, |  | June 30, |  |
| 2021 |  | 2020 |  | 2021 |  | 2020 |  |  |  |
| (in millions)
Service cost | $ | 0.4 |  |  | $ | 0.4 |  |  | $ | 1.2 |  |  | $ | 1.2 |  |  |  |  |
Pension costs (benefits) other than service: |  |  |  |  |  |  |  |  |  |  |
Interest cost | 2.5 |  |  | 2.8 |  |  | 7.5 |  |  | 8.4 |  |  |  |  |
Expected return on plan assets | (3.9) |  |  | (4.2) |  |  | (11.7) |  |  | (12.6) |  |  |  |  |
Amortization of actuarial net loss | 0.6 |  |  | 0.7 |  |  | 1.8 |  |  | 2.0 |  |  |  |  |
Pension benefits other than service | (0.8) |  |  | (0.7) |  |  | (2.4) |  |  | (2.2) |  |  |  |  |
Net periodic benefit | $ | (0.4) |  |  | $ | (0.3) |  |  | $ | (1.2) |  |  | $ | (1.0) |  |  |  |  |
The amortization of actuarial losses, net of tax, is recorded as a component of other comprehensive loss.

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