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Legal Actions and Contingencies (Narrative) (Details) - Contingent Obligations Under Recourse Provisions [Member] - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021
Loss Contingencies [Line Items] |  |  |
Receivables sold with limited recourse | $ 49.5 | $ 30.6 |
Maximum potential contingent liability | 36.0 |  | $ 30.2
Contingent provision | $ 8.1 |  | $ 8.2

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