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Income Taxes
 6 Months Ended
Mar. 31, 2025
Income Tax Disclosure [Abstract]  
Income Taxes INCOME TAXES
Income tax provisions for interim quarterly periods are based on an estimated annual effective income tax rate calculated separately from the effect of significant, infrequent or unusual discrete items related specifically to interim periods. 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)2025202420252024
Income tax expense$12.6 $14.0 $45.9 $25.9 
Effective tax rate percentage24.8 %24.4 %25.8 %25.1 %
The changes in income tax expense year-over-year for the three and six months ended March 31, 2025 were principally driven by pre-tax earnings. Additionally, the modestly higher effective tax rates year-over-year were primarily attributed to decreases in the favorable impact of discrete tax benefits compared to the prior year periods.