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Guarantee Arrangements (Tables) | 12 Months Ended
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Dec. 31, 2023
Non-Contingent Portion |
Guarantor Obligations [Line Items] |
Schedule of Provision for Losses on Customer Guarantees | Changes in the Company’s stand ready obligations (non-contingent) to perform under guarantees were as follows (in millions):
|  | Year Ended December 31, |  |  | (transition period) Three Months Ended December 31, |  |  | Year Ended September 30, |
|  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2021 |
Balance at beginning of period |  | $ | 12.2 |  |  | $ | 12.1 |  |  | $ | 14.1 |  |  | $ | 15.5 |
Adoption of ASC 326 |  | - |  |  |  | — |  |  |  | — |  |  |  | (0.6 | )
Provision for new credit guarantees |  |  | 3.5 |  |  |  | 3.0 |  |  |  | 0.4 |  |  |  | 2.4 |
Changes for pre-existing guarantees, net |  |  | (0.4 | ) |  |  | (1.5 | ) |  |  | 0.3 |  |  |  | (0.5 | )
Amortization of previous guarantees |  |  | (2.8 | ) |  |  | (1.2 | ) |  |  | (2.7 | ) |  |  | (2.8 | )
Foreign currency translation |  |  | (0.1 | ) |  |  | (0.2 | ) |  |  | — |  |  |  | 0.1 |
Balance at end of period |  | $ | 12.4 |  |  | $ | 12.2 |  |  | $ | 12.1 |  |  | $ | 14.1 |
Contingent Portion |
Guarantor Obligations [Line Items] |
Schedule of Provision for Losses on Customer Guarantees | Changes in the Company’s off-balance sheet credit loss exposure (contingent) related to its guarantees were as follows (in millions):
|  | Year Ended December 31, |  |  | (transition period) Three Months Ended December 31, |  |  | Year Ended September 30, |
|  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2021 |
Balance at beginning of period |  | $ | 6.3 |  |  | $ | 4.0 |  |  | $ | 7.3 |  |  | $ | — |
Adoption of ASC 326 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 7.1 |
Provision for new credit guarantees |  |  | 1.5 |  |  |  | 1.6 |  |  |  | 0.1 |  |  |  | 2.1 |
Changes in allowance for pre-existing guarantees, net |  |  | (2.1 | ) |  |  | 1.0 |  |  |  | (3.4 | ) |  |  | (2.0 | )
Foreign currency translation |  |  | 0.1 |  |  |  | (0.3 | ) |  |  | — |  |  |  | 0.1 |
Balance at end of period |  | $ | 5.8 |  |  | $ | 6.3 |  |  | $ | 4.0 |  |  | $ | 7.3 |

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