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Dispositions (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
Dispositions (Details) - USD ($) $ in Millions	Sep. 30, 2025	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets held-for-sale		$ 61.0		$ 61.0		$ 58.1
Current liabilities held-for-sale		30.4		30.4		$ 24.4
Proceeds from Divestiture of Businesses, Net of Cash Divested				30.1	$ 0.0
Impairment charge		8.0	$ 0.0	8.0	$ 0.0
AAM India Manufacturing Corporation Pvt., Ltd.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration		65.0		65.0
Current assets held-for-sale		61.0		61.0
Current liabilities held-for-sale		30.4		30.4
Impairment charge		$ 8.0		8.0
AAM India Manufacturing Corporation Pvt., Ltd. \| Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration	$ 65.0
Proceeds from Divestiture of Businesses, Net of Cash Divested	$ 58.0
Hefei AAM Automotive Driveline & Chassis System Co., Ltd. and Liuzhou AAM Automotive Driveline System Co., Ltd.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Interest in Joint Venture				$ 30.1