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Income Taxes (Tables)
 6 Months Ended
Mar. 31, 2024
Income Tax Disclosure [Abstract]  
Schedule of Income Tax Expense and Effective Tax Rate The following summarizes income tax expense and the effective tax rate in each interim period:
Three months ended
March 31		Six months ended
March 31
(In millions)2024202320242023
Income tax expense (benefit)$14.0 $11.4 $25.9 $(8.7)
Effective tax rate percentage24.4 %25.7 %25.1 %(17.0)%