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Retirement Plans (Tables) | 6 Months Ended
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Mar. 31, 2020
Defined Benefit Plan [Abstract] |
Schedule of Net Periodic Benefit Cost | 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 |  |  |  |  |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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