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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]    
Net income $ 75.7 $ 109.0
Other comprehensive income (loss), net of tax:    
Employee pension and postretirement benefits 0.7  
Currency translation adjustments 19.5 (8.8)
Change in fair value of derivative instruments (0.5)  
Total other comprehensive income (loss), net of tax 19.7 (8.8)
Comprehensive income $ 95.4 $ 100.2