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Retirement and Other Benefit Plans (Tables) | 12 Months Ended
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Sep. 30, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Schedule Of Reconciliation Of Benefit Obligation | ​
​ | ​ | ​ | ​ | ​ | ​
(Dollars in millions) | ​ | ​ | ​ | ​ |
Reconciliation of benefit obligation |  | 2019 |  | 2018
Net benefit obligation at beginning of year | ​ | $ | 89.8 |  | 95.3
Interest cost | ​ |  | 3.7 |  | 3.4
Actuarial loss (gain) | ​ |  | 11.3 |  | (4.3)
Gross benefits paid | ​ |  | (4.7) |  | (4.6)
Settlements | ​ |  | — |  | —
Net benefit obligation at end of year | ​ | $ | 100.1 |  | 89.8
Schedule Of Reconciliation Of Fair Value Of Plan Assets | ​
​ | ​ | ​ | ​ | ​ | ​
(Dollars in millions) |  |  | ​ |  |
Reconciliation of fair value of plan assets | ​ | 2019 | ​ | 2018
Fair value of plan assets at beginning of year | ​ | $ | 73.3 |  | 65.0
Actual return on plan assets | ​ |  | 5.9 |  | 2.7
Employer contributions | ​ |  | 2.7 |  | 10.2
Gross benefits paid | ​ |  | (4.7) |  | (4.6)
Settlements | ​ |  | — |  | —
Fair value of plan assets at end of year | ​ | $ | 77.2 |  | 73.3
Schedule Of Funded Status | ​
​ | ​ | ​ | ​ | ​ | ​
(Dollars in millions) |  |  | ​ |  |
Funded Status | ​ | 2019 | ​ | 2018
Funded status at end of year | ​ | $ | (22.9) |  | (16.5)
Accrued benefit cost | ​ |  | (22.9) |  | (16.5)
​ | ​ | ​ | ​ | ​ | ​
Amounts recognized in the Balance Sheet consist of: | ​ |  | ​ |  |
Current liability | ​ |  | (0.2) |  | (0.2)
Noncurrent liability | ​ |  | (22.7) |  | (16.3)
Accumulated other comprehensive (income)/loss (before tax effect) | ​ |  | 49.6 |  | 41.9
​ | ​ | ​ | ​ | ​ | ​
Amounts recognized in accumulated other comprehensive (income)/loss consist of: | ​ |  | ​ |  |
Net actuarial loss | ​ |  | 49.6 |  | 41.9
​ | ​ | ​ | ​ | ​ | ​
Accumulated other comprehensive (income)/loss (before tax effect) | ​ | $ | 49.6 |  | 41.9
Schedule of components of net periodic benefit cost | The following table provides the components of net periodic benefit cost for the plans for 2019, 2018 and 2017: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in millions) |  | 2019 |  | 2018 |  | 2017
Service cost | ​ | $ | — |  | — |  | —
Interest cost | ​ |  | 3.7 |  | 3.4 |  | 3.2
Expected return on plan assets | ​ |  | (4.4) |  | (3.8) |  | (3.9)
Net actuarial loss | ​ |  | 2.1 |  | 2.3 |  | 2.6
Net periodic benefit cost | ​ |  | 1.4 |  | 1.9 |  | 1.9
Defined contribution plans | ​ |  | 7.3 |  | 7.1 |  | 6.3
Total | ​ | $ | 8.7 |  | 9.0 |  | 8.2
Schedule Of Asset Allocation For Pension Plans Acceptable Range And Target Allocation By Asset Category | The asset allocation for the Company’s pension plans at the end of 2019 and 2018, and the Company’s acceptable range and the target allocation for 2020, by asset category, are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Target |  | ​ |  | Percentage of Plan Assets at |
​ | ​ | Allocation | ​ | Acceptable | ​ | Year-end |
Asset Category | ​ | 2020 | ​ | Range | ​ | 2019 | ​ | 2018 |
Return seeking |  | 53 | % | 48%-58 | % | 41 | % | 44 | %
Liability hedging |  | 47 | % | 42%-52 | % | 56 | % | 54 | %
Cash/cash equivalents |  | 0 | % | 0%-10 | % | 3 | % | 2 | %
Schedule Of Fair Value Of Financial Measurements | The fair values of the Company’s defined benefit plan investments as of September 30, 2019 and 2018, by asset category, were as follows: ​
​ | ​ | ​ | ​ | ​ | ​
(Dollars in millions) |  | 2019 |  | 2018
Investments at fair value: |  | ​ |  |  |
Cash and cash equivalents | ​ | $ | 2.1 |  | 2.1
Common and preferred stock funds: | ​ |  |  |  |
Domestic large capitalization | ​ |  | 8.8 |  | 8.7
Domestic small-/mid-capitalization | ​ |  | 2.4 |  | 2.7
International funds | ​ |  | 10.6 |  | 10.8
Fixed income funds | ​ |  | 49.7 |  | 45.6
Real estate investment funds | ​ |  | 3.6 |  | 3.4
Total investments at fair value | ​ | $ | 77.2 |  | 73.3
Schedule Of Expected Benefit Payments | Information about the expected cash flows for the pension and other postretirement benefit plans follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | Pension |  | Other
(Dollars in millions) | ​ | Benefits | ​ | Benefits
Expected Employer Contributions — 2020 | ​ | $ | 0.7 |  | 0.1
Expected Benefit Payments: | ​ |  |  |  |
2020 | ​ |  | 5.8 |  | 0.1
2021 | ​ |  | 5.5 |  | 0.1
2022 | ​ |  | 5.7 |  | 0.1
2023 | ​ |  | 5.8 |  | 0.1
2024 | ​ | ​ | 5.9 | ​ | 0.1
2025‑2029 | ​ | $ | 30.2 |  | 0.2
Net Periodic Benefit Cost |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Schedule Of Weighted-Average Assumptions Used To Determine The Net Periodic Benefit Cost For Pension Plans | The following weighted-average assumptions were used to determine the net periodic benefit cost for the pension plans: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |  | 2017 |
Discount rate |  | 4.15 | % | 3.65 | % | 3.25 | %
Rate of increase in compensation levels |  | N/A |  | N/A |  | N/A | ​
Expected long-term rate of return on assets |  | 6.00 | % | 6.00 | % | 6.25 | %
Net Periodic Benefit Obligations |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Schedule Of Weighted-Average Assumptions Used To Determine The Net Periodic Benefit Cost For Pension Plans | The following weighted-average assumptions were used to determine the net periodic benefit obligations for the pension plans: ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |
Discount rate |  | 3.05 | % | 4.15 | %
Rate of increase in compensation levels |  | N/A |  | N/A | ​

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