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		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Guarantee Obligations [Line Items]
Balance at beginning of period	$ 14.7	$ 16.0	$ 15.5	$ 15.8
Adoption of ASC 326			(0.6)
Provision for new credit guarantees	0.4	1.7	0.9	3.2
Changes for pre-existing guarantees, net	(0.4)	1.4	(0.2)	1.4
Amortization of previous guarantees	(0.9)	(2.8)	(1.9)	(4.2)
Foreign currency translation		(0.1)	0.1
Balance at end of period	$ 13.8	$ 16.2	$ 13.8	$ 16.2