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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]    
Net income $ 69.5 $ 75.7
Other comprehensive income (loss), net of tax:    
Employee pension and postretirement benefits 1.2 0.7
Currency translation adjustments 31.8 19.5
Change in fair value of derivative instruments (0.1) (0.5)
Total other comprehensive income (loss), net of tax 32.9 19.7
Comprehensive income $ 102.4 $ 95.4