Guarantee Arrangements - Schedule of Provision for Losses on Customer Guarantees (Details1) - Indirect Guarantee of Deferred Payment and Lease Payment Agreements - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Guarantee Obligations [Line Items]
Balance at beginning of year	$ 15.8	$ 10.4
Provision for new credit guarantees	4.9	9.9
Changes for pre-existing guarantees, net	(0.5)	(0.5)
Amortization of previous guarantees	(5.0)	(3.8)
Foreign currency translation	0.3	(0.2)
Balance at end of year	$ 15.5	$ 15.8