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Other Comprehensive Income (Tables) | 12 Months Ended
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Sep. 30, 2021
Statement of Other Comprehensive Income [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Accumulated other comprehensive income (loss) is as follows:
| Foreign currency translation |  | Pension liability, net of tax |  |  |  | Total
| (in millions)
Balance at September 30, 2020 | $ | 8.0 |  |  | $ | (32.7) |  |  |  |  | $ | (24.7) |
Other comprehensive income before reclassifications | 9.2 |  |  | 8.6 |  |  |  |  | 17.8 |
Amounts reclassified out of accumulated other comprehensive loss | — |  |  | 1.9 |  |  |  |  | 1.9 |
Other comprehensive income | 9.2 |  |  | 10.5 |  |  |  |  | 19.7 |
Balance at September 30, 2021 | $ | 17.2 |  |  | $ | (22.2) |  |  |  |  | $ | (5.0) |

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