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Revenue Recognition - Schedule of Impact Due to Contract Adjustments (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Disaggregation of Revenue [Abstract] |  |  |  |
Net sales | $ 0.7 | $ (1.8) | $ (8.0) | $ (12.6)
Operating income | (2.3) | (7.1) | (21.0) | (22.2)
Net income | $ (1.8) | $ (5.4) | $ (16.0) | $ (16.9)
Diluted earnings per share | $ (0.03) | $ (0.08) | $ (0.25) | $ (0.26)

X
- Definition Increase decrease in diluted earnings per share due to margin rate adjustments in dollar per share. + References No definition available. + Details
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Period Type: | duration

X
- Definition Increase (decrease) in net income due to margin rate adjustments for contracts accounted for using the percentage of completion method. + References No definition available. + Details
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X
- Definition Increase (decrease) in net sales due to margin rate adjustments for contracts accounted for using the percentage of completion method. + References No definition available. + Details
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- Definition Increase (decrease) in operating income due to margin rate adjustments for contracts accounted for using the percentage of completion method. + References No definition available. + Details
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Namespace Prefix: | osk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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