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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 472.7	$ 324.5	$ 579.4
Other comprehensive income (loss), net of tax:
Employee pension and postretirement benefits	61.7	(26.5)	(49.4)
Currency translation adjustments	3.8	30.4	(36.3)
Change in fair value of derivative instruments	1.9	(0.7)
Total other comprehensive income (loss), net of tax	67.4	3.2	(85.7)
Comprehensive income	$ 540.1	$ 327.7	$ 493.7

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