Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 476.4	$ 376.8
Accounts receivable, net	966.5	1,035.9
Inventories, net	459.7	392.0
Prepaid expenses and other	127.2	140.3
Total current assets	2,029.8	1,945.0
Property, plant and equipment, net	2,514.4	2,402.9
Deferred income taxes	45.5	37.1
Goodwill	1,141.8	1,654.3
Other intangible assets, net	1,111.1	1,212.5
GM postretirement cost sharing asset	219.4	252.2
Other assets and deferred charges	448.7	378.8
Total assets	7,510.7	7,882.8
Current liabilities
Current portion of long-term debt	121.6	5.9
Accounts payable	840.2	799.0
Accrued compensation and benefits	179.0	200.0
Deferred revenue	44.3	34.1
Accrued expenses and other	171.7	177.4
Total current liabilities	1,356.8	1,216.4
Long-term debt, net	3,686.8	3,969.3
Deferred revenue	77.6	78.8
Deferred income taxes	92.6	101.7
Postretirement benefits and other long-term liabilities	810.6	976.6
Total liabilities	6,024.4	6,342.8
Stockholders' equity
Series A junior participating preferred stock, par value $0.01 per share; 0.1 million shares authorized; no shares outstanding in 2018 or 2017	0.0	0.0
Preferred stock, par value $0.01 per share; 10.0 million shares authorized; no shares outstanding in 2018 or 2017	0.0	0.0
Series common stock, par value $0.01 per share; 40.0 million shares authorized; no shares outstanding in 2018 or 2017	0.0	0.0
Common stock, par value $0.01 per share; 150.0 million shares authorized; 118.9 million and 118.2 million shares issued as of December 31, 2018 and 2017, respectively	1.2	1.2
Paid-in capital	1,292.6	1,264.6
Retained earnings	703.5	761.0
Treasury stock at cost, 7.2 million shares in 2018 and 6.9 million shares in 2017	(201.8)	(198.1)
Accumulated other comprehensive loss
Defined benefit plans, net of tax	(213.9)	(252.0)
Foreign currency translation adjustments	(96.6)	(34.1)
Unrecognized loss on cash flow hedges, net of tax	(1.1)	(6.6)
Total AAM stockholders' equity	1,483.9	1,536.0
Noncontrolling interests in subsidiaries	2.4	4.0
Total stockholders' equity	1,486.3	1,540.0
Total liabilities and stockholders' equity	$ 7,510.7	$ 7,882.8