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Accumulated Other Comprehensive Loss
3 Months Ended
Dec. 31, 2021
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 income0.3 5.7 $6.0 
Balance at December 31, 2021$(21.9)$22.9 $1.0 
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Accumulated other comprehensive income (loss) is as follows:
  Pension, net of tax Foreign currency translationTotal
(in millions)
Balance at September 30, 2021$(22.2)$17.2 $(5.0)
Current period other comprehensive income0.3 5.7 $6.0 
Balance at December 31, 2021$(21.9)$22.9 $1.0