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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
Dec. 31, 2020
Dec. 31, 2019
Guarantee Obligations [Line Items]    
Balance at beginning of period $ 15.5 $ 15.8
Adoption of ASC 326 (5.2)  
Provision for new credit guarantees 0.4 1.5
Changes for pre-existing guarantees, net 0.2  
Amortization of previous guarantees (1.0) (1.4)
Foreign currency translation 0.2 0.1
Balance at end of period $ 10.1 $ 16.0