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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 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Guarantee Obligations [Line Items]        
Balance at beginning of period $ 16.0 $ 10.1 $ 15.8 $ 10.4
Provision for new credit guarantees 1.7 3.1 3.2 4.4
Changes for pre-existing guarantees, net 1.4 1.0 1.4 0.1
Amortization of previous guarantees (2.8) (1.3) (4.2) (2.0)
Foreign currency translation (0.1)      
Balance at end of period $ 16.2 $ 12.9 $ 16.2 $ 12.9