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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
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Guarantee Obligations [Line Items]        
Balance at beginning of period $ 13.8 $ 16.2 $ 15.5 $ 15.8
Adoption of ASC 326     (0.6)  
Provision for new credit guarantees 0.6 0.5 1.5 3.7
Changes for pre-existing guarantees, net (0.2) (1.8) (0.4) (0.4)
Amortization of previous guarantees (0.4) 0.2 (2.3) (4.0)
Foreign currency translation   0.1 0.1 0.1
Balance at end of period $ 13.8 $ 15.2 $ 13.8 $ 15.2