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Retirement Plans | 6 Months Ended
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Mar. 31, 2020
Defined Benefit Plan [Abstract] |
Retirement Plans | Retirement Plans The components of net periodic benefit cost for our pension plans are presented below.
| Three months ended |  |  |  | Six months ended |  |  |  |  |  |
| March 31, |  |  |  | March 31, |  |  |  |  |  |
| 2020 |  | 2019 |  | 2020 |  | 2019 |  |  |  |
| (in millions) |  |  |  |  |  |  |  |  |  |
Service cost | $ | 0.4 |  |  | $ | 0.4 |  |  | $ | 0.8 |  |  |  | $ | 0.8 |  |  |  |  |
Pension costs (benefits) other than service: |  |  |  |  |  |  |  |  |  |  |
Interest cost | 2.8 |  |  | 3.5 |  |  | 5.6 |  |  |  | 7.0 |  |  |  |  |
Expected return on plan assets | (4.2) |  |  | (4.0) |  |  | (8.4) |  |  |  | (8.1) |  |  |  |  |
Amortization of actuarial net loss | 0.6 |  |  | 0.5 |  |  | 1.3 |  |  |  | 1.0 |  |  |  |  |
Curtailment/special settlement loss (gain) | — |  |  | 1.0 |  |  |  | — |  |  |  | 1.0 |  |  |  |  |
Pension costs (benefits) other than service | (0.8) |  |  | 1.0 |  |  | (1.5) |  |  | 0.9 |  |  |  |  |
Net periodic (benefit) cost | $ | (0.4) |  |  | $ | 1.4 |  |  | $ | (0.7) |  |  |  | $ | 1.7 |  |  |  |  |
The amortization of actuarial losses, net of tax, is recorded as a component of other comprehensive loss. During the quarter ended March 31, 2019, we settled our obligation to our Canadian pension plan participants through a combination of lump sum payments and purchases of annuities. We made a contribution to the plans of $1.0 million, which is included in pension costs other than service, to fund these settlements. Also during the quarter ended March 31, 2019, we recorded an estimated settlement liability for our exiting a multi-employer pension plan at one of our manufacturing locations, which resulted in an expense of $1.1 million that we included in strategic reorganization and other charges.

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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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