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Guarantee Arrangements (Tables) | 9 Months Ended
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Jun. 30, 2021
Guarantees [Abstract] |
Schedule of Provision for Losses on Customer Guarantees | Changes in the Company’s guarantee liabilities were as follows (in millions):
|  | Three Months Ended June 30, |  |  | Nine Months Ended June 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
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 |

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- Definition Tabular disclosure pertaining to the provision for losses on customers guarantees. + References No definition available. + Details
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Namespace Prefix: | osk_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_GuaranteesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration