Guarantee Arrangements - Schedule of Provision for Losses on Customer Guarantees (Details1) - Indirect Guarantee of Deferred Payment and Lease Payment Agreements - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Guarantee Obligations [Line Items]
Balance at beginning of period	$ 16.2	$ 12.9	$ 15.8	$ 10.4
Provision for new credit guarantees	0.5	2.3	3.7	6.7
Changes for pre-existing guarantees, net	(1.8)	(0.1)	(0.4)
Amortization of previous guarantees	0.2	(1.0)	(4.0)	(3.0)
Foreign currency translation	0.1		0.1
Balance at end of period	$ 15.2	$ 14.1	$ 15.2	$ 14.1