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Accumulated Other Comprehensive Loss
9 Months Ended
Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Comprehensive Income (Loss) Note [Text Block] Accumulated Other Comprehensive Loss Accumulated other comprehensive loss is presented below.
  Pension, net of tax Foreign currency translationTotal
(in millions)
Balance at September 30, 2020$(32.7)$8.0 $(24.7)
Current period other comprehensive income1.4 8.5 9.9 
Balance at June 30, 2021$(31.3)$16.5 $(14.8)
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Accumulated other comprehensive loss is presented below.
  Pension, net of tax Foreign currency translationTotal
(in millions)
Balance at September 30, 2020$(32.7)$8.0 $(24.7)
Current period other comprehensive income1.4 8.5 9.9 
Balance at June 30, 2021$(31.3)$16.5 $(14.8)