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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Prior Service Costs
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	$ 0.2		$ 0.5	$ 0.2
Actuarial (Gains) Losses
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	0.9	$ (0.1)	2.4	(0.1)
Employee Pension and Postretirement Benefits, Net of Tax
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	1.1	(0.1)	2.9	0.1
Tax provision (benefit)	(0.4)	$ 0.1	(0.8)
Net of tax	$ 0.7		$ 2.1	$ 0.1

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

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