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Retirement and Other Benefit Plans (Tables) | 12 Months Ended
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Sep. 30, 2020
Retirement and Other Benefit Plans |
Schedule Of Reconciliation Of Benefit Obligation | ​
​ | ​ | ​ | ​ | ​ | ​
(Dollars in millions) | ​ | ​ | ​ | ​ |
Reconciliation of benefit obligation |  | 2020 |  | 2019
Net benefit obligation at beginning of year | ​ | $ | 100.1 |  | 89.8
Interest cost | ​ |  | 3.0 |  | 3.7
Actuarial loss | ​ |  | 6.9 |  | 11.3
Gross benefits paid | ​ |  | (4.8) |  | (4.7)
Settlements | ​ |  | (102.4) |  | —
Net benefit obligation at end of year | ​ | $ | 2.8 |  | 100.1
Schedule Of Reconciliation Of Fair Value Of Plan Assets | ​
​ | ​ | ​ | ​ | ​ | ​
(Dollars in millions) |  |  | ​ |  |
Reconciliation of fair value of plan assets | ​ | 2020 | ​ | 2019
Fair value of plan assets at beginning of year | ​ | $ | 77.2 |  | 73.3
Actual return on plan assets | ​ |  | 3.6 |  | 5.9
Employer contributions | ​ |  | 26.4 |  | 2.7
Gross benefits paid | ​ |  | (4.8) |  | (4.7)
Settlements | ​ |  | (102.4) |  | —
Fair value of plan assets at end of year | ​ | $ | — |  | 77.2
Schedule Of Funded Status | ​
​ | ​ | ​ | ​ | ​ | ​
(Dollars in millions) |  |  | ​ |  |
Funded Status | ​ | 2020 | ​ | 2019
Funded status at end of year | ​ | $ | (2.8) |  | (22.9)
Accrued benefit cost | ​ |  | (2.8) |  | (22.9)
​ | ​ | ​ | ​ | ​ | ​
Amounts recognized in the Balance Sheet consist of: | ​ |  | ​ |  | ​
Current liability | ​ |  | (0.3) |  | (0.2)
Noncurrent liability | ​ |  | (2.5) |  | (22.7)
Accumulated other comprehensive loss (before tax effect) | ​ |  | 0.7 |  | 49.6
​ | ​ | ​ | ​ | ​ | ​
Amounts recognized in accumulated other comprehensive loss consist of: | ​ |  | ​ |  | ​
Net actuarial loss | ​ |  | 0.7 |  | 49.6
​ | ​ | ​ | ​ | ​ | ​
Accumulated other comprehensive loss (before tax effect) | ​ | $ | 0.7 |  | 49.6
Schedule of components of net periodic benefit cost | The following table provides the components of net periodic benefit cost for the plans for 2020, 2019 and 2018: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in millions) |  | 2020 |  | 2019 |  | 2018
Service cost | ​ | $ | — |  | — |  | —
Interest cost | ​ |  | 3.0 |  | 3.7 |  | 3.4
Expected return on plan assets | ​ |  | (4.2) |  | (4.4) |  | (3.8)
Settlements | ​ | ​ | 53.6 | ​ | — | ​ | —
Net actuarial loss | ​ |  | 2.8 |  | 2.1 |  | 2.3
Net periodic benefit cost | ​ |  | 55.2 |  | 1.4 |  | 1.9
Defined contribution plans | ​ |  | 7.4 |  | 6.8 |  | 6.6
Total | ​ | $ | 62.6 |  | 8.2 |  | 8.5
Schedule Of Expected Benefit Payments | Information about the expected cash flows for the other postretirement benefit plans follows: ​
​ | ​ | ​ | ​
​ |  | Other
(Dollars in millions) | ​ | Benefits
Expected Benefit Payments: | ​ |  |
2021 | ​ | $ | 0.2
2022 | ​ |  | 0.2
2023 | ​ |  | 0.3
2024 | ​ |  | 0.2
2025 | ​ | ​ | 0.2
2026‑2030 | ​ | $ | 0.9

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- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + 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 (c) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements. + 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 (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the change in the benefit obligation of pension plans and/or other employee benefit plans from the beginning to the end of the period, showing separately, if applicable, the effects of the following: service cost, interest cost, contributions by plan participants, actuarial gains and losses, foreign currency exchange rate changes, benefits paid, plan amendments, business combinations, divestitures, curtailments, settlements, and special and contractual termination benefits. + 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 (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + 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 (f) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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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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