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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]      
Net income $ 324.5 $ 579.4 $ 471.9
Other comprehensive income (loss), net of tax:      
Employee pension and postretirement benefits (26.5) (49.4) 35.3
Currency translation adjustments 30.4 (36.3) (17.6)
Change in fair value of derivative instruments (0.7)   0.5
Total other comprehensive income (loss), net of tax 3.2 (85.7) 18.2
Comprehensive income $ 327.7 $ 493.7 $ 490.1