Restructuring and Other Costs - Schedule of Acquisition, Divestiture and Integration Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Restructuring Cost And Reserve [Line Items]
Acquisition costs			$ 27.9	$ 11.0
Divestiture costs			0.2	0.2
Integration costs			22.6	21.4
Other total	$ 11.5	$ 10.2	50.7	32.6
Other Segments [Member]
Restructuring Cost And Reserve [Line Items]
Acquisition costs	0.9	3.4	27.9	11.0
Divestiture costs			0.2	0.2
Integration costs	10.6	6.8	22.6	21.4
Other total	$ 11.5	$ 10.2	$ 50.7	$ 32.6