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Consolidated Comprehensive Income Statements (Unaudited) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Statement of Comprehensive Income [Abstract]        
Tax effect on translation adjustments $ 9.2 $ 22.6 $ 16.8 $ (1.6)
Tax effect on net gain (loss) on derivatives (15.3) (13.2) (26.4) (10.5)
Tax effect on derivatives reclassification adjustments 8.6 12.0 14.7 11.2
Tax effect on pension and postretirement benefits reclassification adjustments $ 5.5 $ 5.9 $ 10.9 $ 11.8