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Accumulated Other Comprehensive Loss
9 Months Ended
Jun. 30, 2022
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, net of tax Foreign currency translationTotal
(in millions)
Balance at September 30, 2021$(22.2)$17.2 $(5.0)
Current period other comprehensive income1.0 (15.5)$(14.5)
Balance at June 30, 2022$(21.2)$1.7 $(19.5)
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Accumulated other comprehensive income (loss) is as follows:

  Pension, net of tax Foreign currency translationTotal
(in millions)
Balance at September 30, 2021$(22.2)$17.2 $(5.0)
Current period other comprehensive income1.0 (15.5)$(14.5)
Balance at June 30, 2022$(21.2)$1.7 $(19.5)