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Accumulated Other Comprehensive Loss
 9 Months Ended
Jun. 30, 2024
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)$(48.7)
Current period other comprehensive income1.8 4.5 6.3 
Balance at June 30, 2024$(26.7)$(15.7)$(42.4)

For the nine months ended June 30, 2024, pension actuarial amortization included in the condensed consolidated statements of comprehensive income as a component of pension expense other than service was $2.4 million, net of income tax of $0.6 million. Refer to Note 5. Retirement Plans for further information. For the nine months ended June 30, 2024, foreign currency translation included in the condensed consolidated statements of comprehensive income was $4.5 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)$(48.7)
Current period other comprehensive income1.8 4.5 6.3 
Balance at June 30, 2024$(26.7)$(15.7)$(42.4)

For the nine months ended June 30, 2024, pension actuarial amortization included in the condensed consolidated statements of comprehensive income as a component of pension expense other than service was $2.4 million, net of income tax of $0.6 million. Refer to Note 5. Retirement Plans for further information. For the nine months ended June 30, 2024, foreign currency translation included in the condensed consolidated statements of comprehensive income was $4.5 million, net of no income tax.