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Accumulated Other Comprehensive (Loss) Income (Tables)
12 Months Ended
Sep. 30, 2020
Equity [Abstract]  
Summary of Changes in Accumulated Other Comprehensive Loss
The following table summarizes the changes in accumulated other comprehensive loss for the year ended September 30, 2020.
(in millions)Foreign Currency Translation AdjustmentPension Benefits AdjustmentAccumulated Other Comprehensive Loss
Balances as of September 30, 2019$(31.5)$(3.3)$(34.8)
ASU 2018-02 cumulative transition adjustment— (0.7)(0.7)
Adjusted Balances as of September 30, 2019(31.5)(4.0)(35.5)
Other comprehensive loss(4.5)(0.2)(4.7)
Amounts reclassified from AOCI, net of tax— 0.1 0.1 
Other comprehensive loss(4.5)(0.1)(4.6)
Balances as of September 30, 2020$(36.0)$(4.1)$(40.1)