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Consolidated Comprehensive Income Statements (Unaudited) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Statement of Comprehensive Income [Abstract]        
Tax effect on translation adjustments $ 11.3 $ 8.0 $ 0.5 $ 12.9
Tax effect on net gain (loss) on derivatives 6.0   8.6  
Tax effect on net gain (loss) on derivatives   (8.7)   (9.4)
Tax effect on pension and postretirement benefits 0.0 0.0 0.0 (0.8)
Tax effect on derivatives reclassification adjustments (5.0)   (5.8)  
Tax effect on derivatives reclassification adjustments   11.5   10.7
Tax effect on pension and postretirement benefits reclassification adjustments $ 6.5 $ 6.0 $ 13.0 $ 11.0