Supplemental Guarantor Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Net cash provided by (used in) operating activities	$ (80.2)	$ 66.9
Investing activities
Purchases of property, plant and equipment	(124.2)	(130.8)
Proceeds from sale of property, plant and equipment	0.3	0.4
Purchase buyouts of leased equipment	0.0	(0.5)
Payments to Acquire Businesses, Net of Cash Acquired	0.0	(1.3)
Intercompany Activity - Investing	0.0	0.0
Net cash used in investing activities	(123.9)	(132.2)
Financing activities
Net debt activity	(14.1)	34.5
Debt issuance costs	0.0	(6.8)
Purchase of treasury stock	(7.3)	(3.5)
Purchase of noncontrolling interest	0.0	(0.9)
Intercompany Activity - Financing	0.0	0.0
Net cash provided by (used in) financing activities	(21.4)	23.3
Effect of exchange rate changes on cash	1.2	5.9
Net increase (decrease) in cash, cash equivalents and restricted cash	(224.3)	(36.1)
Cash, cash equivalents and restricted cash	254.6	340.7	$ 478.9	$ 376.8
Consolidation, Eliminations [Member]
Net cash provided by (used in) operating activities	0.0	0.0
Investing activities
Purchases of property, plant and equipment	0.0	0.0
Proceeds from sale of property, plant and equipment	0.0	0.0
Purchase buyouts of leased equipment	0.0	0.0
Payments to Acquire Businesses, Net of Cash Acquired		0.0
Intercompany Activity - Investing	0.0	0.0
Net cash used in investing activities	0.0	0.0
Financing activities
Net debt activity	0.0	0.0
Debt issuance costs	0.0	0.0
Purchase of treasury stock	0.0	0.0
Purchase of noncontrolling interest		0.0
Intercompany Activity - Financing	0.0	0.0
Net cash provided by (used in) financing activities	0.0	0.0
Effect of exchange rate changes on cash	0.0	0.0
Net increase (decrease) in cash, cash equivalents and restricted cash	0.0	0.0
Cash, cash equivalents and restricted cash	0.0	0.0	0.0	0.0
Holdings [Member]
Net cash provided by (used in) operating activities	0.0	0.0
Investing activities
Purchases of property, plant and equipment	0.0	0.0
Proceeds from sale of property, plant and equipment	0.0	0.0
Purchase buyouts of leased equipment	0.0	0.0
Payments to Acquire Businesses, Net of Cash Acquired		0.0
Intercompany Activity - Investing	0.0	0.0
Net cash used in investing activities	0.0	0.0
Financing activities
Net debt activity	0.0	0.0
Debt issuance costs	0.0	0.0
Purchase of treasury stock	(7.3)	(3.5)
Purchase of noncontrolling interest		0.0
Intercompany Activity - Financing	7.3	3.5
Net cash provided by (used in) financing activities	0.0	0.0
Effect of exchange rate changes on cash	0.0	0.0
Net increase (decrease) in cash, cash equivalents and restricted cash	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 (used in) operating activities	27.8	46.5
Investing activities
Purchases of property, plant and equipment	(11.8)	(21.5)
Proceeds from sale of property, plant and equipment	0.0	0.0
Purchase buyouts of leased equipment	0.0	0.0
Payments to Acquire Businesses, Net of Cash Acquired		0.0
Intercompany Activity - Investing	0.0	(0.1)
Net cash used in investing activities	(11.8)	(21.6)
Financing activities
Net debt activity	(8.0)	8.9
Debt issuance costs	0.0	(6.8)
Purchase of treasury stock	0.0	0.0
Purchase of noncontrolling interest		0.0
Intercompany Activity - Financing	(7.3)	(3.5)
Net cash provided by (used in) financing activities	(15.3)	(1.4)
Effect of exchange rate changes on cash	0.0	0.0
Net increase (decrease) in cash, cash equivalents and restricted cash	0.7	23.5
Cash, cash equivalents and restricted cash	37.4	115.4	36.7	91.9
Guarantor Subsidiaries [Member]
Net cash provided by (used in) operating activities	47.6	39.0
Investing activities
Purchases of property, plant and equipment	(41.4)	(37.6)
Proceeds from sale of property, plant and equipment	0.3	0.3
Purchase buyouts of leased equipment	0.0	(0.5)
Payments to Acquire Businesses, Net of Cash Acquired		0.0
Intercompany Activity - Investing	(6.4)	0.1
Net cash used in investing activities	(47.5)	(37.7)
Financing activities
Net debt activity	(0.2)	(0.2)
Debt issuance costs	0.0	0.0
Purchase of treasury stock	0.0	0.0
Purchase of noncontrolling interest		(0.9)
Intercompany Activity - Financing	0.0	0.0
Net cash provided by (used in) financing activities	(0.2)	(1.1)
Effect of exchange rate changes on cash	0.0	0.0
Net increase (decrease) in cash, cash equivalents and restricted cash	(0.1)	0.2
Cash, cash equivalents and restricted cash	2.6	0.3	2.7	0.1
Non-Guarantor Subsidiaries [Member]
Net cash provided by (used in) operating activities	(155.6)	(18.6)
Investing activities
Purchases of property, plant and equipment	(71.0)	(71.7)
Proceeds from sale of property, plant and equipment	0.0	0.1
Purchase buyouts of leased equipment	0.0	0.0
Payments to Acquire Businesses, Net of Cash Acquired		(1.3)
Intercompany Activity - Investing	6.4	0.0
Net cash used in investing activities	(64.6)	(72.9)
Financing activities
Net debt activity	(5.9)	25.8
Debt issuance costs	0.0	0.0
Purchase of treasury stock	0.0	0.0
Purchase of noncontrolling interest		0.0
Intercompany Activity - Financing	0.0	0.0
Net cash provided by (used in) financing activities	(5.9)	25.8
Effect of exchange rate changes on cash	1.2	5.9
Net increase (decrease) in cash, cash equivalents and restricted cash	(224.9)	(59.8)
Cash, cash equivalents and restricted cash	$ 214.6	$ 225.0	$ 439.5	$ 284.8

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