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Accumulated Other Comprehensive Income (Loss) - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) on Condensed Consolidated Statements of Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Prior Service Costs
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	$ 0.2	$ 0.2	$ 0.6	$ 0.5
Actuarial (Gains) Losses
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	1.5	0.9	4.0	2.4
Employee Pension and Postretirement Benefits, Net of Tax
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	1.7	1.1	4.6	2.9
Tax benefit	(0.6)	(0.4)	(1.1)	(0.8)
Net of tax	$ 1.1	$ 0.7	$ 3.5	$ 2.1

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Amount before tax of reclassification adjustments of other comprehensive income (loss).

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