Income Taxes (Details) - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Earnings before income taxes		$ 29.6	$ 7.6
Effective tax rate		24.40%	105.70%
Income tax provision		$ 7.2	$ 8.0
Restructuring and related costs	[1]	8.0	18.5
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax provision		7.2	8.0
US Tax Act
Income Tax Disclosure [Abstract]
Income tax provision			4.7
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax provision			4.7
Project Fuel
Income Tax Disclosure [Abstract]
Restructuring and related costs		$ 8.0	$ 18.5

[1] Includes pre-tax SG&A of $1.9 and $1.4 for the three months ended December 31, 2019 and 2018, respectively, associated with certain information technology enablement expenses for Project Fuel.