CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current Assets
Cash and cash equivalents	$ 78.9	$ 62.4
Accounts receivable, net	559.5	463.4
Inventories, net	233.2	224.3
Prepaid expenses and other current assets	120.6	122.0
Total current assets	992.2	872.1
Property, plant and equipment, net	1,036.8	1,009.7
Deferred income taxes	366.2	366.1
Goodwill	156.2	156.4
GM postretirement cost sharing asset	252.5	259.7
Other assets and deferred charges	204.8	202.0
Total assets	3,008.7	2,866.0
Current Liabilities
Accounts payable	450.7	396.1
Accrued compensation and benefits	90.1	84.9
Deferred revenue	15.8	17.2
Accrued expenses and other current liabilities	90.4	102.6
Total current liabilities	647.0	600.8
Long-term debt	1,546.5	1,454.1
Deferred revenue	79.5	82.2
Postretirement benefits and other long-term liabilities	837.3	849.7
Total liabilities	3,110.3	2,986.8
Stockholders' Deficit
Common stock, par value $0.01 per share	0.8	0.8
Paid-in capital	604.9	600.9
Accumulated deficit	(242.7)	(275.8)
Treasury stock at cost, 6.0 million shares as of June 30, 2013 and December 31, 2012	(182.2)	(182.1)
Accumulated other comprehensive income (loss), net of tax
Defined benefit plans	(273.9)	(274.5)
Foreign currency translation adjustments	(9.2)	7.6
Unrecognized gain on derivatives	0.7	2.3
Total AAM stockholders' deficit	(101.6)	(120.8)
Noncontrolling interest in subsidiaries	0	0
Total stockholders’ deficit	(101.6)	(120.8)
Total liabilities and stockholders' deficit	$ 3,008.7	$ 2,866.0