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Other Comprehensive Income (Tables)
12 Months Ended
Sep. 30, 2021
Statement of Other Comprehensive Income [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Accumulated other comprehensive income (loss) is as follows:
Foreign currency translationPension liability, net of taxTotal
(in millions)
Balance at September 30, 2020$8.0 $(32.7)$(24.7)
Other comprehensive income before reclassifications9.2 8.6 17.8 
Amounts reclassified out of accumulated other comprehensive loss— 1.9 1.9 
Other comprehensive income9.2 10.5 19.7 
Balance at September 30, 2021$17.2 $(22.2)$(5.0)