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Accumulated Other Comprehensive Loss | 3 Months Ended
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Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Comprehensive Income (Loss) Note [Text Block] | Accumulated Other Comprehensive Income (Loss) Accumulated other comprehensive income (loss) is as follows:
| Pension actuarial amortization, net of income tax |  | Foreign currency translation, net of income tax |  | Total
| (in millions)
Balance at September 30, 2023 | $ | (28.5) |  |  | $ | (20.2) |  |  | $ | (48.7) |
Current period other comprehensive income | 0.6 |  |  | 13.3 |  |  | 13.9 |
Balance at December 31, 2023 | $ | (27.9) |  |  | $ | (6.9) |  |  | $ | (34.8) |
For the three months ended December 31, 2023, pension actuarial amortization included in the condensed consolidated statements of comprehensive income as a component of pension expense other than service was $0.8 million, net of income tax of $0.2 million. Refer to Note 5. Retirement Plans for further information. For the three months ended December 31, 2023, foreign currency translation included in the condensed consolidated statements of comprehensive income was $13.3 million, net of no income tax.
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Accumulated other comprehensive income (loss) is as follows:
| Pension actuarial amortization, net of income tax |  | Foreign currency translation, net of income tax |  | Total
| (in millions)
Balance at September 30, 2023 | $ | (28.5) |  |  | $ | (20.2) |  |  | $ | (48.7) |
Current period other comprehensive income | 0.6 |  |  | 13.3 |  |  | 13.9 |
Balance at December 31, 2023 | $ | (27.9) |  |  | $ | (6.9) |  |  | $ | (34.8) |
For the three months ended December 31, 2023, pension actuarial amortization included in the condensed consolidated statements of comprehensive income as a component of pension expense other than service was $0.8 million, net of income tax of $0.2 million. Refer to Note 5. Retirement Plans for further information. For the three months ended December 31, 2023, foreign currency translation included in the condensed consolidated statements of comprehensive income was $13.3 million, net of no income tax.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//220/tableOfContent + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481694/830-30-45-20 + Details
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