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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		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Prior Service Costs
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	$ 0.1	$ 0.2	$ 0.3	$ 0.2
Actuarial (Gains) Losses
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	0.8	0.1	1.5
Employee Pension and Postretirement Benefits, Net of Tax
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	0.9	0.3	1.8	0.2
Tax provision (benefit)	(0.2)	(0.2)	(0.4)	(0.1)
Net of tax	$ 0.7	$ 0.1	$ 1.4	$ 0.1

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

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