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Accumulated Other Comprehensive Loss
6 Months Ended
Mar. 31, 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 $(24.7)
Current period other comprehensive income1.0 4.0 5.0 
Balance at March 31, 2021$(31.7)$12.0 $(19.7)
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Accumulated other comprehensive loss is presented below.
  Pension, net of tax Foreign currency translationTotal
(in millions)
Balance at September 30, 2020$(32.7)$8.0 $(24.7)
Current period other comprehensive income1.0 4.0 5.0 
Balance at March 31, 2021$(31.7)$12.0 $(19.7)