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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
Dec. 31, 2020
Dec. 31, 2019
Prior Service Costs    
Reclassification out of Accumulated Other Comprehensive Income [Line Items]    
Total before tax $ 0.2 $ 0.2
Actuarial (Gains) Losses    
Reclassification out of Accumulated Other Comprehensive Income [Line Items]    
Total before tax 1.3 0.7
Employee Pension and Postretirement Benefits, Net of Tax    
Reclassification out of Accumulated Other Comprehensive Income [Line Items]    
Total before tax 1.5 0.9
Tax provision (benefit) (0.3) (0.2)
Net of tax $ 1.2 $ 0.7