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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Non-Contingent Portion |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Balance at beginning of period | $ 12.1 | $ 13.8 | $ 12.1 | $ 14.7
Provision for new credit guarantees | 0.4 | 0.9 | 2.4 | 2.0
Changes in allowance for pre-existing guarantees, net | (0.1) | (0.1) | (1.2) | (0.7)
Amortization of previous guarantees | (0.2) | (0.5) | (1.0) | (1.8)
Foreign currency translation | (0.2) |  | (0.3) | (0.1)
Balance at end of period | 12.0 | 14.1 | 12.0 | 14.1
Contingent Portion |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |
Balance at beginning of period | 6.7 | 6.8 | 4.0 | 6.9
Provision for new credit guarantees | 0.2 | 0.9 | 1.3 | 1.6
Changes in allowance for pre-existing guarantees, net | (0.2) | (0.4) | 1.6 | (1.2)
Foreign currency translation | (0.2) |  | (0.4) |
Balance at end of period | $ 6.5 | $ 7.3 | $ 6.5 | $ 7.3

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- Definition Represents the reduction in the provision for losses related to the amortization of previous guarantees. + References No definition available. + Details
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Namespace Prefix: | osk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Increase or decrease in guarantee obligations liability due to currency translation. + References No definition available. + Details
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Namespace Prefix: | osk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Represents the reserve to cover probable loss on account of customer guarantee obligations as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | osk_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant

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- Definition Represents the aggregate increase or decrease in the liability during the reporting period for accruals related to preexisting guarantee obligations. + References No definition available. + Details
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Namespace Prefix: | osk_
Data Type: | xbrli:monetaryItemType
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- Definition Represents the provision for loss on customer guarantee obligations attributable to new guarantees issued during the period. + References No definition available. + Details
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Namespace Prefix: | osk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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