Supplemental Guarantor Condensed Consolidating Financial Statements - Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net cash provided by operating activities	$ 559.6	$ 771.5	$ 647.0
Investing activities
Purchases of property, plant and equipment	(433.3)	(524.7)	(477.7)
Proceeds from sale of property, plant and equipment	5.0	4.9	2.5
Purchase buyouts of leased equipment	(0.9)	(0.5)	(13.3)
Proceeds from sale of business	141.2	47.1	5.9
Acquisition of business, net of cash acquired	(9.4)	(1.3)	(895.5)
Investment in affiliates	(9.2)	(3.7)	0.0
Intercompany activity	0.0	0.0
Net cash used in investing activities	(306.6)	(478.2)	(1,378.1)
Financing activities
Net debt activity	(189.2)	(171.6)	712.7
Debt issuance costs	(3.3)	(6.9)	(91.0)
Employee stock option exercises	0.0	0.0	0.9
Purchase of treasury stock	(7.5)	(3.7)	(7.0)
Purchase of noncontrolling interest	0.0	(2.3)	0.0
Intercompany activity	0.0	0.0	0.0
Net cash provided by (used in) financing activities	(200.0)	(184.5)	615.6
Effect of exchange rate changes on cash	0.1	(6.7)	11.1
Net increase (decrease) in cash, cash equivalents and restricted cash	53.1	102.1	(104.4)
Cash, cash equivalents and restricted cash	532.0	478.9	376.8	$ 481.2
Consolidation, Eliminations [Member]
Net cash provided by operating activities	0.0	0.0	0.0
Investing activities
Purchases of property, plant and equipment	0.0	0.0	0.0
Proceeds from sale of property, plant and equipment	0.0	0.0	0.0
Purchase buyouts of leased equipment	0.0	0.0	0.0
Proceeds from sale of business	0.0	0.0	0.0
Acquisition of business, net of cash acquired	0.0	0.0	0.0
Investment in affiliates	0.0	0.0
Intercompany activity	0.0	0.0
Net cash used in investing activities	0.0	0.0	0.0
Financing activities
Net debt activity	0.0	0.0	0.0
Debt issuance costs	0.0	0.0	0.0
Employee stock option exercises			0.0
Purchase of treasury stock	0.0	0.0	0.0
Purchase of noncontrolling interest	0.0	0.0
Intercompany activity	0.0	0.0	0.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0
Effect of exchange rate changes on cash	0.0	0.0	0.0
Net increase (decrease) in cash, cash equivalents and restricted cash	0.0	0.0	0.0
Cash, cash equivalents and restricted cash	0.0	0.0	0.0	0.0
Holdings [Member]
Net cash provided by operating activities	0.0	0.0	0.0
Investing activities
Purchases of property, plant and equipment	0.0	0.0	0.0
Proceeds from sale of property, plant and equipment	0.0	0.0	0.0
Purchase buyouts of leased equipment	0.0	0.0	0.0
Proceeds from sale of business	0.0	0.0	0.0
Acquisition of business, net of cash acquired	0.0	0.0	0.0
Investment in affiliates	0.0	0.0
Intercompany activity	0.0	0.0
Net cash used in investing activities	0.0	0.0	0.0
Financing activities
Net debt activity	0.0	0.0	0.0
Debt issuance costs	0.0	0.0	0.0
Employee stock option exercises			0.0
Purchase of treasury stock	(7.5)	(3.7)	(7.0)
Purchase of noncontrolling interest	0.0	0.0
Intercompany activity	7.5	3.7	7.0
Net cash provided by (used in) financing activities	0.0	0.0	0.0
Effect of exchange rate changes on cash	0.0	0.0	0.0
Net increase (decrease) in cash, cash equivalents and restricted cash	0.0	0.0	0.0
Cash, cash equivalents and restricted cash	0.0	0.0	0.0	0.0
AAM Inc. [Member]
Net cash provided by operating activities	230.7	262.0	410.4
Investing activities
Purchases of property, plant and equipment	(58.7)	(63.2)	(69.1)
Proceeds from sale of property, plant and equipment	0.0	0.0	0.3
Purchase buyouts of leased equipment	0.0	0.0	(13.3)
Proceeds from sale of business	141.2	0.0	7.5
Acquisition of business, net of cash acquired	0.0	0.0	(953.5)
Investment in affiliates	0.0	(3.0)
Intercompany activity	0.0	0.0
Net cash used in investing activities	82.5	(66.2)	(1,028.1)
Financing activities
Net debt activity	(167.7)	(240.4)	725.6
Debt issuance costs	(3.3)	(6.9)	(91.0)
Employee stock option exercises			0.9
Purchase of treasury stock	0.0	0.0	0.0
Purchase of noncontrolling interest	0.0	0.0
Intercompany activity	(10.2)	(3.7)	(10.2)
Net cash provided by (used in) financing activities	(181.2)	(251.0)	625.3
Effect of exchange rate changes on cash	0.0	0.0	0.0
Net increase (decrease) in cash, cash equivalents and restricted cash	132.0	(55.2)	7.6
Cash, cash equivalents and restricted cash	168.7	36.7	91.9	84.3
Guarantor Subsidiaries [Member]
Net cash provided by operating activities	42.3	145.5	33.1
Investing activities
Purchases of property, plant and equipment	(119.9)	(163.8)	(100.4)
Proceeds from sale of property, plant and equipment	4.5	4.3	0.3
Purchase buyouts of leased equipment	0.0	(0.5)	0.0
Proceeds from sale of business	0.0	42.7	(1.6)
Acquisition of business, net of cash acquired	0.0	0.0	64.6
Investment in affiliates	0.0	0.0
Intercompany activity	(12.0)	(44.1)
Net cash used in investing activities	(127.4)	(161.4)	(37.1)
Financing activities
Net debt activity	(1.1)	(0.7)	(0.7)
Debt issuance costs	0.0	0.0	0.0
Employee stock option exercises			0.0
Purchase of treasury stock	0.0	0.0	0.0
Purchase of noncontrolling interest	0.0	(2.3)
Intercompany activity	83.7	21.5	3.2
Net cash provided by (used in) financing activities	82.6	18.5	2.5
Effect of exchange rate changes on cash	0.0	0.0	0.0
Net increase (decrease) in cash, cash equivalents and restricted cash	(2.5)	2.6	(1.5)
Cash, cash equivalents and restricted cash	0.2	2.7	0.1	1.6
Non-Guarantor Subsidiaries [Member]
Net cash provided by operating activities	286.6	364.0	203.5
Investing activities
Purchases of property, plant and equipment	(254.7)	(297.7)	(308.2)
Proceeds from sale of property, plant and equipment	0.5	0.6	1.9
Purchase buyouts of leased equipment	(0.9)	0.0	0.0
Proceeds from sale of business	0.0	4.4	0.0
Acquisition of business, net of cash acquired	(9.4)	(1.3)	(6.6)
Investment in affiliates	(9.2)	(0.7)
Intercompany activity	12.0	44.1
Net cash used in investing activities	(261.7)	(250.6)	(312.9)
Financing activities
Net debt activity	(20.4)	69.5	(12.2)
Debt issuance costs	0.0	0.0	0.0
Employee stock option exercises			0.0
Purchase of treasury stock	0.0	0.0	0.0
Purchase of noncontrolling interest	0.0	0.0
Intercompany activity	(81.0)	(21.5)	0.0
Net cash provided by (used in) financing activities	(101.4)	48.0	(12.2)
Effect of exchange rate changes on cash	0.1	(6.7)	11.1
Net increase (decrease) in cash, cash equivalents and restricted cash	(76.4)	154.7	(110.5)
Cash, cash equivalents and restricted cash	$ 363.1	$ 439.5	$ 284.8	$ 395.3

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The net cash inflow or outflow related to capital contributions or loans made to intercompany partners.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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