Supplemental Guarantor Condensed Consolidating Financial Statements 2013 and 2012 Balance Sheets (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current Assets
Cash and cash equivalents	$ 154.0	$ 62.4	$ 169.2	$ 244.6
Accounts receivable, net	458.5	463.4
Inventories, net	261.8	224.3
Other current assets	123.5	122.0
Total current assets	997.8	872.1
Property, plant and equipment, net	1,058.5	1,009.7
Goodwill	156.4	156.4	155.9
Other assets and deferred charges	816.3	827.8
Investment in subsidiaries	0	0
Total assets	3,029.0	2,866.0
Current Liabilities
Accounts Payable	445.8	396.1
Other current liabilities	221.3	204.7
Total current liabilities	667.1	600.8
Intercompany payable (receivable)	0	0
Long-term debt	1,559.1	1,454.1
Investment in subsidiaries obligation	0	0
Other liabilities, noncurrent	769.2	931.9
Total liabilities	2,995.4	2,986.8
Total AAM stockholders' equity (deficit)	33.6	(120.8)
Noncontrolling interest in subsidiaries	0	0	5.9	11.4
Total stockholders’ equity (deficit)	33.6	(120.8)
Total liabilities and stockholders' equity (deficit)	3,029.0	2,866.0
Holdings [Member]
Current Assets
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	0	0
Inventories, net	0	0
Other current assets	0	0
Total current assets	0	0
Property, plant and equipment, net	0	0
Goodwill	0	0
Other assets and deferred charges	0	0
Investment in subsidiaries	360.5	202.9
Total assets	360.5	202.9
Current Liabilities
Accounts Payable	0	0
Other current liabilities	0	0
Total current liabilities	0	0
Intercompany payable (receivable)	326.9	323.7
Long-term debt	0	0
Investment in subsidiaries obligation	0	0
Other liabilities, noncurrent	0	0
Total liabilities	326.9	323.7
Total AAM stockholders' equity (deficit)	33.6	(120.8)
Noncontrolling interest in subsidiaries	0	0
Total stockholders’ equity (deficit)	33.6	(120.8)
Total liabilities and stockholders' equity (deficit)	360.5	202.9
AAM Inc. [Member]
Current Assets
Cash and cash equivalents	36.9	10.6	83.7	67.6
Accounts receivable, net	102.7	94.4
Inventories, net	62.4	48.7
Other current assets	43.8	48.8
Total current assets	245.8	202.5
Property, plant and equipment, net	239.8	250.4
Goodwill	0	0
Other assets and deferred charges	671.7	706.1
Investment in subsidiaries	1,233.2	1,094.6
Total assets	2,390.5	2,253.6
Current Liabilities
Accounts Payable	106.2	91.4
Other current liabilities	120.4	124.5
Total current liabilities	226.6	215.9
Intercompany payable (receivable)	(390.1)	(420.6)
Long-term debt	1,500.0	1,387.5
Investment in subsidiaries obligation	0	0
Other liabilities, noncurrent	693.5	867.9
Total liabilities	2,030.0	2,050.7
Total AAM stockholders' equity (deficit)	360.5	202.9
Noncontrolling interest in subsidiaries	0	0
Total stockholders’ equity (deficit)	360.5	202.9
Total liabilities and stockholders' equity (deficit)	2,390.5	2,253.6
Guarantor Subsidiaries of Certain Notes [Member]
Current Assets
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	25.6	25.3
Inventories, net	34.2	31.6
Other current assets	3.2	3.5
Total current assets	63.0	60.4
Property, plant and equipment, net	83.0	84.2
Goodwill	147.8	147.8
Other assets and deferred charges	44.8	40.0
Investment in subsidiaries	0	0
Total assets	338.6	332.4
Current Liabilities
Accounts Payable	44.5	37.3
Other current liabilities	4.1	3.8
Total current liabilities	48.6	41.1
Intercompany payable (receivable)	(219.5)	(188.7)
Long-term debt	5.3	5.6
Investment in subsidiaries obligation	15.2	7.6
Other liabilities, noncurrent	0.5	1.2
Total liabilities	(149.9)	(133.2)
Total AAM stockholders' equity (deficit)	488.5	465.6
Noncontrolling interest in subsidiaries	0	0
Total stockholders’ equity (deficit)	488.5	465.6
Total liabilities and stockholders' equity (deficit)	338.6	332.4
Non-Guarantor Subsidiaries [Member]
Current Assets
Cash and cash equivalents	117.1	51.8	85.5	177.0
Accounts receivable, net	330.2	343.7
Inventories, net	165.2	144.0
Other current assets	76.5	69.7
Total current assets	689.0	609.2
Property, plant and equipment, net	735.7	675.1
Goodwill	8.6	8.6
Other assets and deferred charges	99.8	81.7
Investment in subsidiaries	0	0
Total assets	1,533.1	1,374.6
Current Liabilities
Accounts Payable	295.1	267.4
Other current liabilities	96.8	76.4
Total current liabilities	391.9	343.8
Intercompany payable (receivable)	282.7	285.6
Long-term debt	53.8	61.0
Investment in subsidiaries obligation	0	0
Other liabilities, noncurrent	75.2	62.8
Total liabilities	803.6	753.2
Total AAM stockholders' equity (deficit)	729.5	621.4
Noncontrolling interest in subsidiaries	0	0
Total stockholders’ equity (deficit)	729.5	621.4
Total liabilities and stockholders' equity (deficit)	1,533.1	1,374.6
Consolidation, Eliminations [Member]
Current Assets
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	0	0
Inventories, net	0	0
Other current assets	0	0
Total current assets	0	0
Property, plant and equipment, net	0	0
Goodwill	0	0
Other assets and deferred charges	0	0
Investment in subsidiaries	(1,593.7)	(1,297.5)
Total assets	(1,593.7)	(1,297.5)
Current Liabilities
Accounts Payable	0	0
Other current liabilities	0	0
Total current liabilities	0	0
Intercompany payable (receivable)	0	0
Long-term debt	0	0
Investment in subsidiaries obligation	(15.2)	(7.6)
Other liabilities, noncurrent	0	0
Total liabilities	(15.2)	(7.6)
Total AAM stockholders' equity (deficit)	(1,578.5)	(1,289.9)
Noncontrolling interest in subsidiaries	0	0
Total stockholders’ equity (deficit)	(1,578.5)	(1,289.9)
Total liabilities and stockholders' equity (deficit)	$ (1,593.7)	$ (1,297.5)

This element represents the net payables/(receivables) arising from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, such as pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's' management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

No definition available.