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Accumulated Other Comprehensive Loss
6 Months Ended
Mar. 31, 2020
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, 2019$(36.0) $—  $(36.0) 
Current period other comprehensive income1.1  1.8  $2.9  
Balance at March 31, 2020$(34.9) $1.8  $(33.1) 
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Accumulated other comprehensive loss is presented below.
  Pension, net of tax Foreign currency translationTotal
(in millions)
Balance at September 30, 2019$(36.0) $—  $(36.0) 
Current period other comprehensive income1.1  1.8  $2.9  
Balance at March 31, 2020$(34.9) $1.8  $(33.1)