CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current Assets
Cash and cash equivalents	$ 118.6	$ 62.4
Accounts receivable, net	596.9	463.4
Inventories, net	251.5	224.3
Prepaid expenses and other current assets	124.7	122.0
Total current assets	1,091.7	872.1
Property, plant and equipment, net	1,041.8	1,009.7
Deferred income taxes	360.0	366.1
Goodwill	156.5	156.4
GM postretirement cost sharing asset	251.2	259.7
Other assets and deferred charges	217.3	202.0
Total assets	3,118.5	2,866.0
Current Liabilities
Accounts payable	485.0	396.1
Accrued compensation and benefits	102.0	84.9
Deferred revenue	14.5	17.2
Accrued expenses and other current liabilities	102.6	102.6
Total current liabilities	704.1	600.8
Long-term debt	1,572.6	1,454.1
Deferred revenue	76.7	82.2
Postretirement benefits and other long-term liabilities	811.9	849.7
Total liabilities	3,165.3	2,986.8
Stockholders' Deficit
Common stock, par value $0.01 per share	0.8	0.8
Paid-in capital	611.4	600.9
Accumulated deficit	(211.1)	(275.8)
Treasury stock at cost, 6.0 million shares as of September 30, 2013 and December 31, 2012	(182.5)	(182.1)
Accumulated other comprehensive income (loss), net of tax
Defined benefit plans	(258.8)	(274.5)
Foreign currency translation adjustments	(6.7)	7.6
Unrecognized gain on derivatives	0.1	2.3
Total AAM stockholders' deficit	(46.8)	(120.8)
Noncontrolling interest in subsidiaries	0	0
Total stockholders’ deficit	(46.8)	(120.8)
Total liabilities and stockholders' deficit	$ 3,118.5	$ 2,866.0