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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, 2021
Sep. 30, 2020
Guarantee Obligations [Line Items]    
Balance at beginning of year $ 15.5 $ 15.8
Adoption of ASC 326 (0.6)  
Provision for new credit guarantees 2.4 4.9
Changes for pre-existing guarantees, net (0.5) (0.5)
Amortization of previous guarantees (2.8) (5.0)
Foreign currency translation 0.1 0.3
Balance at end of year $ 14.1 $ 15.5