American Axle & Manufacturing (AXL) 10-Q 1 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document	3 Months Ended
	Mar. 31, 2015	Apr. 29, 2015
Entity Registrant Name	AMERICAN AXLE & MANUFACTURING HOLDINGS INC
Entity Central Index Key	1062231
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Document Period End Date	31-Mar-15
Amendment Flag	FALSE
Document Type	10-Q
Entity Well-known Seasoned Issuer	Yes
Entity Common Stock, Shares Outstanding		75,815,272
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Net sales	$969.10	$858.80
Cost of goods sold	816.3	736.9
Gross profit	152.8	121.9
Selling, general and administrative expenses	68.5	57.1
Operating income	84.3	64.8
Interest expense	-25.1	-25
Investment income	0.8	0.3
Other income, net	2.4	0.5
Income before income taxes	62.4	40.6
Income tax expense	9.2	7
Net income	$53.20	$33.60
Basic earnings per share	$0.69	$0.44
Diluted earnings per share	$0.68	$0.44

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Net income	$53.20	$33.60
Other comprehensive income (loss), net of tax
Defined benefit plans, net of tax	3.9	5.1
Foreign currency translation adjustments	-31.5	7.8
Change in derivatives	-0.5	0.9
Other comprehensive income (loss)	-28.1	13.8
Comprehensive income	$25.10	$47.40

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME PARENTHETICAL (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Other comprehensive income (loss), pension and other postretirement benefit plans, tax	($2)	($2.70)

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Current Assets
Cash and cash equivalents	$205.70	$249.20
Accounts receivable, net	668	532.7
Inventories, net	238.5	248.8
Prepaid expenses and other current assets	111.8	108.8
Total current assets	1,224	1,139.50
Property, plant and equipment, net	1,040	1,061.10
Deferred income taxes	362.9	368.8
Goodwill	154.3	155
GM postretirement cost sharing asset	263.7	274.5
Other assets and deferred charges	262.9	260.3
Total assets	3,307.80	3,259.20
Current Liabilities
Current portion of long-term debt	13.9	13
Accounts payable	489.8	444.3
Accrued compensation and benefits	102.4	109.1
Deferred revenue	22	22.1
Accrued expenses and other current liabilities	103.9	98.7
Total current liabilities	732	687.2
Long-term debt	1,520.80	1,523.40
Deferred revenue	88.9	94.2
Postretirement benefits and other long-term liabilities	823.8	841
Total liabilities	3,165.50	3,145.80
Stockholders' equity
Common stock, par value $0.01 per share	0.8	0.8
Paid-in capital	627.8	623.7
Retained earnings (Accumulated deficit)	21.8	-31.4
Treasury stock at cost, 6.1 million shares at both March 31, 2015 and December 31, 2014	-183.1	-182.8
Accumulated other comprehensive income (loss), net of tax
Defined benefit plans	-236.7	-240.6
Foreign currency translation adjustments	-80.4	-48.9
Unrecognized loss on derivatives	-7.9	-7.4
Total stockholders’ equity	142.3	113.4
Total liabilities and stockholders' equity	$3,307.80	$3,259.20

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS PARENTHETICAL (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, except Per Share data, unless otherwise specified
Common stock, par or stated value per share	$0.01	$0.01
Treasury stock, shares	6.1	6.1

CONDENSED_CONSOLIDATED_STATEME3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Operating activities
Net income	$53.20	$33.60
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation and amortization	50	46.9
Deferred income taxes	3.9	-0.7
Stock-based compensation	3.6	2
Pensions and other postretirement benefits, net of contributions	-0.7	-0.1
Gain on disposal of property, plant and equipment, net	0	-4
Changes in operating assets and liabilities
Accounts receivable	-140.6	-194.2
Inventories	7.2	5.2
Accounts payable and accrued expenses	52.5	25
Deferred revenue	-4.5	35.7
Other assets and liabilities	-18.2	-4.9
Net cash provided by (used in) operating activities	6.4	-55.5
Investing activities
Purchases of property, plant and equipment	-43.6	-47.9
Proceeds from sale of property, plant and equipment	0.1	7.9
Net cash used in investing activities	-43.5	-40
Financing Activities
Net short-term borrowings under credit facilities	0	29
Payments of long-term debt and capital lease obligations	-2.2	-11.5
Proceeds from issuance of long-term debt	1	3.1
Debt issuance costs	0	-0.2
Purchase of treasury stock	-0.3	-0.3
Employee stock option exercises	0.4	0.6
Net cash provided by (used in) financing activities	-1.1	20.7
Effect of exchange rate changes on cash	-5.3	0.4
Net decrease in cash and cash equivalents	-43.5	-74.4
Cash and cash equivalents at beginning of period	249.2	154
Cash and cash equivalents at end of period	205.7	79.6
Supplemental cash flow information
Interest paid	19.3	14.1
Income taxes paid, net of refunds	$5.50	$4.50

Organization_and_Basis_of_Pres

Organization and Basis of Presentation	3 Months Ended
	Mar. 31, 2015
Organization and Basis of Presentation [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	1. ORGANIZATION AND BASIS OF PRESENTATION
	Organization  American Axle & Manufacturing Holdings, Inc. (Holdings) and its subsidiaries (collectively, we, our, us or AAM) is a Tier I supplier to the automotive industry. We manufacture, engineer, design and validate driveline and drivetrain systems and related components and chassis modules for light trucks, sport utility vehicles (SUVs), passenger cars, crossover vehicles and commercial vehicles. Driveline and drivetrain systems include components that transfer power from the transmission and deliver it to the drive wheels. Our driveline, drivetrain and related products include axles, chassis modules, driveshafts, power transfer units, transfer cases, chassis and steering components, driveheads, transmission parts, electric drive systems and metal-formed products. In addition to locations in the United States (U.S.) (Michigan, Ohio, Indiana and Pennsylvania), we also have offices or facilities in Brazil, China, Germany, India, Japan, Luxembourg, Mexico, Poland, Scotland, South Korea, Sweden and Thailand.
	Basis of Presentation  We have prepared the accompanying interim condensed consolidated financial statements in accordance with the instructions to Form 10-Q under the Securities Exchange Act of 1934.  These condensed consolidated financial statements are unaudited but include all normal recurring adjustments, which we consider necessary for a fair presentation of the information set forth herein.  Results of operations for the periods presented are not necessarily indicative of the results for the full fiscal year.
	The balance sheet at December 31, 2014 presented herein has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States of America (GAAP) for complete consolidated financial statements.
	In order to prepare the accompanying interim condensed consolidated financial statements, we are required to make estimates and assumptions that affect the reported amounts and disclosures in our interim condensed consolidated financial statements.  Actual results could differ from those estimates.
	For further information, refer to the audited consolidated financial statements and notes included in our Annual Report on Form 10-K for the year ended December 31, 2014.
	Effect of New Accounting Standards On April 7, 2015, the Financial Accounting Standards Board (FASB) issued an accounting standards update (ASU) which changes the presentation of debt issuance costs in financial statements. Under the ASU, an entity would present such costs in the balance sheet as a direct deduction of the related debt liability rather than as an asset. Amortization of the costs will continue to be reported as interest expense. This ASU becomes effective for AAM at the beginning of our 2016 fiscal year and early adoption is permitted. We estimate the effect of implementing this ASU on our consolidated financial statements would reduce both our other assets and deferred charges and long-term debt by approximately $15.5 million at December 31, 2015.
	In 2014, new accounting guidance was issued that outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The guidance is based on the principle that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.  The guidance also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to fulfill a contract.  Entities have the option of using either a full retrospective or a modified retrospective approach for the adoption of the new standard.  This guidance becomes effective for AAM at the beginning of our 2017 fiscal year, however on April 1, 2015, the FASB proposed to defer the effective date of this revenue recognition guidance by one year. We are currently assessing the impact that this standard will have on our consolidated financial statements.

Inventories

Inventories	3 Months Ended
	Mar. 31, 2015
Inventories [Abstract]
Inventory Disclosure [Text Block]	2. INVENTORIES
	We state our inventories at the lower of cost or market.  The cost of our inventories is determined using the FIFO method.  When we determine that our gross inventories exceed usage requirements, or if inventories become obsolete or otherwise not saleable, we record a provision for such loss as a component of our inventory accounts.
	Inventories consist of the following:
		March 31, 2015			December 31, 2014
		(in millions)
	Raw materials and work-in-progress	$	234.2		$	243.8
	Finished goods	32.6			32.9
	Gross inventories	266.8			276.7
	Inventory valuation reserves	(28.3		)	(27.9		)
	Inventories, net	$	238.5		$	248.8

LongTerm_Debt

Long-Term Debt	3 Months Ended
	Mar. 31, 2015
Long-term Debt, Unclassified [Abstract]
Long-term Debt [Text Block]	3. LONG-TERM DEBT
	Long-term debt consists of the following:
		March 31, 2015		December 31, 2014
		(in millions)
	Revolving Credit Facility	$	—	$	—
	Term Facility	140.6		142.5
	7.75% Notes	200		200
	6.625% Notes	550		550
	6.25% Notes	400		400
	5.125% Notes	200		200
	Foreign credit facilities	39.2		38.9
	Capital lease obligations	4.9		5
	Debt	1,534.70		1,536.40
	Less: Current portion of long-term debt	13.9		13
	Long-term debt	$	1,520.80	$	1,523.40
	Revolving Credit Facility and Term Facility As of March 31, 2015, the revolving credit facility provided up to $523.5 million of revolving bank financing commitments through September 13, 2018.  At March 31, 2015, we had $505.5 million available under the revolving credit facility.  This availability reflects a reduction of $18.0 million for standby letters of credit issued against the facility.
	The revolving credit facility provides back-up liquidity for our foreign credit facilities.  We intend to use the availability of long-term financing under the revolving credit facility to refinance any current maturities related to such debt agreements that are not otherwise refinanced on a long-term basis in their local markets, except where otherwise reclassified to current portion of long-term debt on our Condensed Consolidated Balance Sheet.
	In the first three months of both 2015 and 2014, we made principal payments of $1.9 million on our term facility.
	We utilize local currency credit facilities to finance the operations of certain foreign subsidiaries.  At March 31, 2015, $39.2 million was outstanding under these facilities and an additional $46.2 million was available.
	The weighted-average interest rate of our long-term debt outstanding was 6.4% at March 31, 2015 and December 31, 2014.

Fair_Value

Fair Value	3 Months Ended
	Mar. 31, 2015
Fair Value [Abstract]
Fair Value Disclosures [Text Block]	4. FAIR VALUE
	The fair value accounting guidance defines fair value as “the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.”  The definition is based on an exit price rather than an entry price, regardless of whether the entity plans to hold or sell the asset.  This guidance also establishes a fair value hierarchy to prioritize inputs used in measuring fair value as follows:
	•	Level 1:  Observable inputs such as quoted prices in active markets;
	•	Level 2:  Inputs, other than quoted prices in active markets, that are observable either directly or indirectly; and
	•	Level 3:  Unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.
	Financial instruments   The estimated fair value of our financial assets and liabilities that are recognized at fair value on a recurring basis, using available market information and other observable data, are as follows:
			March 31, 2015				December 31, 2014
			Carrying Amount		Fair Value		Carrying Amount		Fair Value		Input
			(in millions)				(in millions)
	Balance Sheet Classification
	Cash equivalents		$	29	$	29	$	35.3	$	35.3	Level 1
	Other accrued expenses
	Currency forward contracts		8.3		8.3		8.3		8.3		Level 2
	Other long-term liabilities
	Currency forward contracts		0.3		0.3		0.1		0.1		Level 2
	The carrying values of our cash, accounts receivable, accounts payable and accrued liabilities approximate their fair values due to the short-term maturities of these instruments.  The carrying values of our borrowings under the foreign credit facilities approximate their fair value due to the frequent resetting of the interest rates.  We estimated the fair value of the amounts outstanding on our debt using available market information and other observable data, to be as follows:
			March 31, 2015				December 31, 2014
			Carrying  Amount		Fair Value		Carrying  Amount		Fair Value
											Input
			(in millions)				(in millions)
	Revolving Credit Facility		$	—	$	—	$	—	$	—	Level 2
	Term Facility		140.6		139.2		142.5		141.1		Level 2
	7.75% Notes		200		227		200		224		Level 2
	6.625% Notes		550		589.2		550		583		Level 2
	6.25% Notes		400		422		400		419		Level 2
	5.125% Notes		200		205.2		200		202.6		Level 2

Derivatives

Derivatives	3 Months Ended
	Mar. 31, 2015
Derivatives [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Text Block]	5. DERIVATIVES
	Our business and financial results are affected by fluctuations in world financial markets, including interest rates and currency exchange rates.  Our hedging policy has been developed to manage these risks to an acceptable level based on management’s judgment of the appropriate trade-off between risk, opportunity and cost.  We do not hold financial instruments for trading or speculative purposes.
	Currency forward contracts  From time to time, we use foreign currency forward contracts to reduce the effects of fluctuations in exchange rates, primarily relating to the Mexican Peso, Euro, Swedish Krona, Polish Zloty and Pound Sterling.  As of March 31, 2015, we have currency forward contracts outstanding with a notional amount of $108.2 million that hedge our exposure to changes in foreign currency exchange rates for our payroll expenses, indirect inventory and other working capital items.
	The following table summarizes the reclassification of pre-tax derivative losses into net income from accumulated other comprehensive income (loss):
		Location of	Loss Reclassified During					Loss Expected to
		Loss	Three Months Ended					be Reclassified
		Reclassified into	March 31,					During the
		Net Income	2015			2014		Next 12 Months
			(in millions)
	Currency forward contracts	Cost of Goods Sold	$	(1.5	)	$	—	$	(7.6	)

Employee_Benefit_Plans

Employee Benefit Plans	3 Months Ended
	Mar. 31, 2015
Employee Benefit Plans [Abstract]
Pension and Other Postretirement Benefits Disclosure [Text Block]	6. EMPLOYEE BENEFIT PLANS
	The components of net periodic benefit cost (credit) are as follows:
		Pension Benefits
		Three Months Ended
		March 31,
		2015			2014
		(in millions)
	Service cost	$	0.8		$	0.9
	Interest cost	7.2			9
	Expected asset return	(10.6		)	(12.1		)
	Amortized loss	1.7			1.3
	Net periodic benefit credit	$	(0.9	)	$	(0.9	)
		Other Postretirement Benefits
		Three Months Ended
		March 31,
		2015			2014
		(in millions)
	Service cost	$	0.1		$	0.1
	Interest cost	3.8			3.8
	Amortized loss	0.2			0.2
	Amortized prior service credit	(0.7		)	(0.7		)
	Net periodic benefit cost	$	3.4		$	3.4
	Due to the availability of our prefunding balances (previous contributions in excess of prior required pension contributions), we are not required to make any cash payments in 2015. We expect our cash payments for other postretirement benefit obligations in 2015, net of GM cost sharing, to be approximately $16 million.

Product_Warranties

Product Warranties	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies [Abstract]
Product Warranty Disclosure [Text Block]
	7	PRODUCT WARRANTIES
	We record a liability for estimated warranty obligations at the dates our products are sold. These estimates are established using sales volumes and internal and external warranty data where there is no payment history and historical information about the average cost of warranty claims for customers with prior claims. We estimate our costs based on the contractual arrangements with our customers, existing customer warranty terms and internal and external warranty data, which includes a determination of our warranty claims and actions taken to improve product quality and minimize warranty claims. We continuously evaluate these estimates and our customers' administration of their warranty programs. We closely monitor actual warranty claim data and adjust the liability, as necessary, on a quarterly basis.
	The following table provides a reconciliation of changes in the product warranty liability:
			Three Months Ended
			March 31,
			2015			2014
			(in millions)
	Beginning balance		$	12.4		$	14.3
	Accruals		4.5			4.2
	Settlements		(0.2		)	(0.8		)
	Adjustment to prior period accruals, net		1.4			0.2
	Foreign currency translation		(0.2		)	0.1
	Ending balance		$	17.9		$	18

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2015
Income Taxes [Abstract]
Income Tax Disclosure [Text Block]	8. INCOME TAXES
	We are required to adjust our effective tax rate each quarter to estimate our annual effective tax rate. We must also record the tax impact of certain discrete, unusual or infrequently occurring items, including changes in judgment about valuation allowances and effects of changes in tax laws or rates, in the interim period in which they occur. In addition, jurisdictions with a projected loss for the year or a year-to-date loss where no tax benefit can be recognized are excluded from the estimated annual effective tax rate. The impact of such an exclusion could result in a higher or lower effective tax rate during a particular quarter, based upon the mix and timing of actual earnings versus annual projections.
	Income tax expense was $9.2 million in the three months ended March 31, 2015 as compared to $7.0 million in the three months ended March 31, 2014.  Our effective income tax rate was 14.8% in the first quarter of 2015 as compared to 17.3% in the first quarter of 2014. Our income tax expense and effective tax rate for the three months ended March 31, 2015 and March 31, 2014 primarily reflect favorable foreign tax rates, along with our inability to realize a tax benefit for current foreign losses.
	Our income tax expense and effective tax rate for the three months ended March 31, 2015 also reflect a tax benefit of $1.0 million related to the settlement of the IRS audits for 2010 and 2011.
	Based on the status of the audits outside the U.S., and the protocol of finalizing audits by the relevant tax authorities, it is not possible to estimate the impact of changes, if any, to previously recorded uncertain tax positions or predict the timing of the conclusion of all ongoing audits with certainty. As of March 31, 2015 and December 31, 2014, we have recorded a liability for unrecognized income tax benefits and related interest and penalties of $60.8 million and $59.5 million, respectively. We anticipate that the current 2007 through 2009 audits with the Mexican tax authorities will be completed before the end of 2015 and will result in a cash payment to the tax authorities.
	Although it is difficult to estimate with certainty the amount of an audit settlement for the years currently under audit, we do not expect the settlement will be materially different from what we have recorded in unrecognized tax benefits. We will continue to monitor the progress and conclusions of all ongoing audits and will adjust our estimated liability as necessary.

Earnings_Per_Share_EPS

Earnings Per Share (EPS)	3 Months Ended
	Mar. 31, 2015
Earnings (Loss) per Share (EPS) [Abstract]
Earnings Per Share [Text Block]	9. EARNINGS PER SHARE (EPS)
	We present earnings per share (EPS) using the two-class method. This method allocates undistributed earnings between common shares and non-vested share based payment awards that entitle the holder to nonforfeitable dividend rights. Our participating securities include non-vested restricted stock units.
	The following table sets forth the computation of our basic and diluted EPS available to shareholders of common stock (excluding participating securities):
		Three Months Ended
		March 31,
		2015			2014
		(in millions, except per share data)
	Numerator
	Net income	$	53.2		$	33.6
	Less: Net income attributable to participating securities	(1.2		)	(0.6		)
	Net income attributable to common shareholders - Basic	$	52		$	33
	Undistributed earnings reallocated to common shareholders under two step	—			—
	dilutive method
	Net income attributable to common shareholders - Dilutive	$	52		$	33
	Denominators
	Basic common shares outstanding -
	Weighted-average shares outstanding	77.5			77
	Less: Participating securities	(1.7		)	(1.4		)
	Weighted-average common shares outstanding	75.8			75.6
	Effect of dilutive securities -
	Dilutive stock-based compensation	0.3			0.1
	Diluted shares outstanding -
	Adjusted weighted-average shares after assumed conversions	76.1			75.7
	Basic EPS	$	0.69		$	0.44
	Diluted EPS	$	0.68		$	0.44
	Certain exercisable stock options were excluded from the computations of diluted EPS because the exercise price of these options was greater than the average period market prices. The number of stock options outstanding, which were not included in the calculation of diluted EPS, was 0.2 million at March 31, 2015 and 1.1 million at March 31, 2014. The exercise price related to the excluded exercisable stock options was $26.02 at March 31, 2015 and a range of $19.54 - $40.83 at March 31, 2014.

Reclassifications_out_of_Accum

Reclassifications out of Accumulated Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2015
Disclosure of Reclassification Amount [Text Block]	10. RECLASSIFICATIONS OUT OF ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
	Reclassification adjustments and other activity impacting accumulated other comprehensive income (loss) during the three months ended March 31, 2015 and March 31, 2014 are as follows (in millions):
		Defined Benefit Plans				Foreign Currency Translation Adjustments			Unrecognized Loss on Derivatives				Total
	Balance at December 31, 2014	$	(240.6	)		$	(48.9	)	$	(7.4	)		$	(296.9	)
	Other comprehensive income (loss) before reclassifications	3.1			(a)	(31.5		)	(2.0		)		(30.4		)
	Amounts reclassified from accumulated other comprehensive income (loss)	0.8			(a)(b)	—			1.5			(c)	2.3
	Net current period other comprehensive income (loss)	3.9				(31.5		)	(0.5		)		(28.1		)
	Balance at March 31, 2015	$	(236.7	)		$	(80.4	)	$	(7.9	)		$	(325.0	)
		Defined Benefit Plans				Foreign Currency Translation Adjustments			Unrecognized Loss on Derivatives				Total
	Balance at December 31, 2013	$	(197.9	)		$	(18.6	)	$	0.3			$	(216.2	)
	Other comprehensive income before reclassifications	4.5			(a)	7.8			0.9				13.2
	Amounts reclassified from accumulated other comprehensive income (loss)	0.6			(a)(b)	—			—			(c)	0.6
	Net current period other comprehensive income	5.1				7.8			0.9				13.8
	Balance at March 31, 2014	$	(192.8	)		$	(10.8	)	$	1.2			$	(202.4	)
	(a)	The amounts are net of tax of $(1.6) million and $(0.4) million for other comprehensive income before reclassifications and the amounts reclassified from AOCI, respectively, for the three months ended March 31, 2015, and $(2.5) million and $(0.2) million, respectively, for the three months ended March 31, 2014.
	(b)	The net amount reclassified from AOCI included $0.9 million in cost of goods sold (COGS) and $(0.1) million in selling, general & administrative expenses (SG&A) for the three months ended March 31, 2015 and $0.8 million in COGS and $(0.2) million in SG&A for the three months ended March 31, 2014.
	(c)	The amounts reclassified from AOCI are included in COGS.

Supplemental_Guarantor_Condens

Supplemental Guarantor Condensed Consolidating Financial Statements	3 Months Ended
	Mar. 31, 2015
Supplemental Guarantor Condensed Consolidating Financial Statements [Abstract]
Supplemental Guarantor Disclosure [Text Block]	11. SUPPLEMENTAL GUARANTOR CONDENSED CONSOLIDATING FINANCIAL STATEMENTS
	Holdings has no significant assets other than its 100% ownership in AAM, Inc. and no direct subsidiaries other than AAM, Inc. The 7.75% Notes, 6.625% Notes, 6.25% Notes and 5.125% Notes are senior unsecured obligations of AAM Inc.; all of which are fully and unconditionally guaranteed by Holdings and substantially all domestic subsidiaries of AAM, Inc, which are 100% indirectly owned by Holdings.
	These Condensed Consolidating Financial Statements are prepared under the equity method of accounting whereby the investments in subsidiaries are recorded at cost and adjusted for the parent’s share of the subsidiaries’ cumulative results of operations, capital contributions and distributions, and other equity changes.
	Condensed Consolidating Statements of Income
	Three Months Ended March 31,
	(in millions)
		Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
	2015
	Net sales
	External	$	—		$	274.9		$	57.2		$	637		$	—		$	969.1
	Intercompany	—			3.1			64.4			4.6			(72.1		)	—
	Total net sales	—			278			121.6			641.6			(72.1		)	969.1
	Cost of goods sold	—			270.9			100.7			516.8			(72.1		)	816.3
	Gross profit	—			7.1			20.9			124.8			—			152.8
	Selling, general and administrative expenses	—			59.5			—			9			—			68.5
	Operating income (loss)	—			(52.4		)	20.9			115.8			—			84.3
	Non-operating income (expense), net	—			(25.4		)	2.3			1.2			—			(21.9		)
	Income (loss) before income taxes	—			(77.8		)	23.2			117			—			62.4
	Income tax expense (benefit)	—			4.5			(0.4		)	5.1			—			9.2
	Earnings (loss) from equity in subsidiaries	53.2			74.9			(6.0		)	—			(122.1		)	—
	Net income (loss) before royalties and dividends	53.2			(7.4		)	17.6			111.9			(122.1		)	53.2
	Royalties and dividends	—			60.6			—			(60.6		)	—			—
	Net income after royalties and dividends	53.2			53.2			17.6			51.3			(122.1		)	53.2
	Other comprehensive loss	(28.1		)	(28.1		)	(27.0		)	(28.7		)	83.8			(28.1		)
	Comprehensive income (loss)	$	25.1		$	25.1		$	(9.4	)	$	22.6		$	(38.3	)	$	25.1
		Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
	2014
	Net sales
	External	$	—		$	227.9		$	58		$	572.9		$	—		$	858.8
	Intercompany	—			2.8			58.1			5.9			(66.8		)	—
	Total net sales	—			230.7			116.1			578.8			(66.8		)	858.8
	Cost of goods sold	—			231.9			99.6			472.2			(66.8		)	736.9
	Gross profit (loss)	—			(1.2		)	16.5			106.6			—			121.9
	Selling, general and administrative expenses	—			48.6			0.1			8.4			—			57.1
	Operating income (loss)	—			(49.8		)	16.4			98.2			—			64.8
	Non-operating income (expense), net	—			(25.8		)	2.7			(1.1		)	—			(24.2		)
	Income (loss) before income taxes	—			(75.6		)	19.1			97.1			—			40.6
	Income tax expense	—			0.4			—			6.6			—			7
	Earnings (loss) from equity in subsidiaries	33.6			54.5			(9.2		)	—			(78.9		)	—
	Net income (loss) before royalties and dividends	33.6			(21.5		)	9.9			90.5			(78.9		)	33.6
	Royalties and dividends	—			55.1			—			(55.1		)	—			—
	Net income after royalties and dividends	33.6			33.6			9.9			35.4			(78.9		)	33.6
	Other comprehensive income	13.8			13.8			7.8			8.9			(30.5		)	13.8
	Comprehensive income	$	47.4		$	47.4		$	17.7		$	44.3		$	(109.4	)	$	47.4
	Condensed Consolidating Balance Sheets
	(in millions)
		Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
	March 31, 2015
	Assets
	Current assets
	Cash and cash equivalents	$	—		$	80.1		$	—		$	125.6		$	—		$	205.7
	Accounts receivable, net	—			165.9			30.4			471.7			—			668
	Intercompany receivables	—			212.7			194.7			9.4			(416.8		)	—
	Inventories, net	—			67.4			31.7			139.4			—			238.5
	Other current assets	—			55.3			2.5			54			—			111.8
	Total current assets	—			581.4			259.3			800.1			(416.8		)	1,224.00
	Property, plant and equipment, net	—			224.8			86.9			728.3			—			1,040.00
	Goodwill	—			—			147.9			6.4			—			154.3
	Intercompany notes and accounts receivable	—			489.9			226			—			(715.9		)	—
	Other assets and deferred charges	—			719.8			47			122.7			—			889.5
	Investment in subsidiaries	463.1			1,173.80			—			—			(1,636.9		)	—
	Total assets	$	463.1		$	3,189.70		$	767.1		$	1,657.50		$	(2,769.6	)	$	3,307.80
	Liabilities and stockholders’ equity
	Current liabilities
Current portion of long-term debt	$	—		$	10.3		$	—		$	3.6		$	—		$	13.9
Accounts payable	—			143.1			45.8			300.9			—			489.8
Intercompany payables	—			191			114.9			110.9			(416.8		)	—
Other current liabilities	—			108.4			5.2			114.7			—			228.3
Total current liabilities	—			452.8			165.9			530.1			(416.8		)	732
Intercompany notes and accounts payable	320.8			6.9			—			388.2			(715.9		)	—
Long-term debt	—			1,480.30			4.9			35.6			—			1,520.80
Investment in subsidiaries obligation	—			—			83.6			—			(83.6		)	—
Other long-term liabilities	—			786.6			0.7			125.4			—			912.7
Total liabilities	320.8			2,726.60			255.1			1,079.30			(1,216.3		)	3,165.50
Total stockholders’ equity	142.3			463.1			512			578.2			(1,553.3		)	142.3
Total liabilities and stockholders’ equity	$	463.1		$	3,189.70		$	767.1		$	1,657.50		$	(2,769.6	)	$	3,307.80
	Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
December 31, 2014
Assets
Current assets
Cash and cash equivalents	$	—		$	69.7		$	—		$	179.5		$	—		$	249.2
Accounts receivable, net	—			137.5			23.9			371.3			—			532.7
Intercompany receivables	—			231			174.1			10			(415.1		)	—
Inventories, net	—			64.9			32.3			151.6			—			248.8
Other current assets	—			53.6			2.6			52.6			—			108.8
Total current assets	—			556.7			232.9			765			(415.1		)	1,139.50
Property, plant and equipment, net	—			230			87.9			743.2			—			1,061.10
Goodwill	—			—			147.9			7.1			—			155
Intercompany notes and accounts receivable	—			509.4			219.1			—			(728.5		)	—
Other assets and deferred charges	—			736.6			45.7			121.3			—			903.6
Investment in subsidiaries	433.8			1,134.60			—			—			(1,568.4		)	—
Total assets	$	433.8		$	3,167.30		$	733.5		$	1,636.60		$	(2,712.0	)	$	3,259.20
Liabilities and stockholders’ equity
Current liabilities
Current portion of long-term debt	$	—		$	9.4		$	—		$	3.6		$	—		$	13
Accounts payable	—			127.3			38.9			278.1			—			444.3
Intercompany payables	—			177			105.3			132.8			(415.1		)	—
Other current liabilities	—			121			4.4			104.5			—			229.9
Total current liabilities	—			434.7			148.6			519			(415.1		)	687.2
Intercompany notes and accounts payable	320.4			6.9			—			401.2			(728.5		)	—
Long-term debt	—			1,483.10			4.9			35.4			—			1,523.40
Investment in subsidiaries obligation	—			—			53.8			—			(53.8		)	—
Other long-term liabilities	—			808.8			0.6			125.8			—			935.2
Total liabilities	320.4			2,733.50			207.9			1,081.40			(1,197.4		)	3,145.80
Total stockholders’ equity	113.4			433.8			525.6			555.2			(1,514.6		)	113.4
Total liabilities and stockholders’ equity	$	433.8		$	3,167.30		$	733.5		$	1,636.60		$	(2,712.0	)	$	3,259.20
Condensed Consolidating Statements of Cash Flows
Three Months Ended March 31,
(in millions)
	Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
2015
Net cash provided by (used in) operating activities	$	—		$	19.7		$	11.2		$	(24.5	)	$	—		$	6.4
Investing activities
Purchases of property, plant and equipment	—			(7.5		)	(2.1		)	(34.0		)	—			(43.6		)
Proceeds from sale of property, plant and equipment	—			0.1			—			—			—			0.1
Intercompany activity	—			—			(9.0		)	—			9			—
Net cash used in investing activities	—			(7.4		)	(11.1		)	(34.0		)	9			(43.5		)
Financing activities
Net debt activity	—			(2.0		)	(0.1		)	0.9			—			(1.2		)
Employee stock option exercises	—			0.4			—			—			—			0.4
Purchase of treasury stock	(0.3		)	—			—			—			—			(0.3		)
Intercompany activity	0.3			(0.3		)	—			9			(9.0		)	—
Net cash provided by (used in) financing activities	—			(1.9		)	(0.1		)	9.9			(9.0		)	(1.1		)
Effect of exchange rate changes on cash	—			—			—			(5.3		)	—			(5.3		)
Net increase (decrease) in cash and cash equivalents	—			10.4			—			(53.9		)	—			(43.5		)
Cash and cash equivalents at beginning of period	—			69.7			—			179.5			—			249.2
Cash and cash equivalents at end of period	$	—		$	80.1		$	—		$	125.6		$	—		$	205.7
	Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
2014
Net cash provided by (used in) operating activities	$	—		$	(25.8	)	$	14.8		$	(44.5	)	$	—		$	(55.5	)
Investing activities
Purchases of property, plant and equipment	—			(9.3		)	(2.7		)	(35.9		)	—			(47.9		)
Proceeds from sale of property, plant and equipment	—			7.7			—			0.2			—			7.9
Intercompany activity	—			—			(12.0		)	—			12			—
Net cash used in investing activities	—			(1.6		)	(14.7		)	(35.7		)	12			(40.0		)
Financing activities
Net debt activity	—			(0.1		)	(0.1		)	20.8			—			20.6
Debt issuance costs	—			(0.2		)	—			—			—			(0.2		)
Employee stock option exercises	—			0.6			—			—			—			0.6
Purchase of treasury stock	(0.3		)	—			—			—			—			(0.3		)
Intercompany activity	0.3			(0.3		)	—			12			(12.0		)	—
Net cash provided by (used in) financing activities	—			—			(0.1		)	32.8			(12.0		)	20.7
Effect of exchange rate changes on cash	—			—			—			0.4			—			0.4
Net decrease in cash and cash equivalents	—			(27.4		)	—			(47.0		)	—			(74.4		)
Cash and cash equivalents at beginning of period	—			36.9			—			117.1			—			154
Cash and cash equivalents at end of period	$	—		$	9.5		$	—		$	70.1		$	—		$	79.6

Organization_and_Basis_of_Pres1

Organization and Basis of Presentation Effect of New Accounting Standards (Policies)	3 Months Ended
	Mar. 31, 2015
New Accounting Policies [Abstract]
New Accounting Pronouncements, Policy [Policy Text Block]	Effect of New Accounting Standards On April 7, 2015, the Financial Accounting Standards Board (FASB) issued an accounting standards update (ASU) which changes the presentation of debt issuance costs in financial statements. Under the ASU, an entity would present such costs in the balance sheet as a direct deduction of the related debt liability rather than as an asset. Amortization of the costs will continue to be reported as interest expense. This ASU becomes effective for AAM at the beginning of our 2016 fiscal year and early adoption is permitted. We estimate the effect of implementing this ASU on our consolidated financial statements would reduce both our other assets and deferred charges and long-term debt by approximately $15.5 million at December 31, 2015.
	In 2014, new accounting guidance was issued that outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The guidance is based on the principle that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.  The guidance also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to fulfill a contract.  Entities have the option of using either a full retrospective or a modified retrospective approach for the adoption of the new standard.  This guidance becomes effective for AAM at the beginning of our 2017 fiscal year, however on April 1, 2015, the FASB proposed to defer the effective date of this revenue recognition guidance by one year. We are currently assessing the impact that this standard will have on our consolidated financial statements.

Inventories_Tables

Inventories (Tables)	3 Months Ended
	Mar. 31, 2015
Inventories [Abstract]
Schedule of Inventory, Current [Table Text Block]	Inventories consist of the following:
		March 31, 2015			December 31, 2014
		(in millions)
	Raw materials and work-in-progress	$	234.2		$	243.8
	Finished goods	32.6			32.9
	Gross inventories	266.8			276.7
	Inventory valuation reserves	(28.3		)	(27.9		)
	Inventories, net	$	238.5		$	248.8

LongTerm_Debt_Tables

Long-Term Debt (Tables)	3 Months Ended
	Mar. 31, 2015
Long Term Debt and Lease Obligations [Abstract]
Schedule of Long-term Debt Instruments [Table Text Block]	Long-term debt consists of the following:
		March 31, 2015		December 31, 2014
		(in millions)
	Revolving Credit Facility	$	—	$	—
	Term Facility	140.6		142.5
	7.75% Notes	200		200
	6.625% Notes	550		550
	6.25% Notes	400		400
	5.125% Notes	200		200
	Foreign credit facilities	39.2		38.9
	Capital lease obligations	4.9		5
	Debt	1,534.70		1,536.40
	Less: Current portion of long-term debt	13.9		13
	Long-term debt	$	1,520.80	$	1,523.40

Fair_Value_Tables

Fair Value (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The estimated fair value of our financial assets and liabilities that are recognized at fair value on a recurring basis, using available market information and other observable data, are as follows:
		March 31, 2015				December 31, 2014
		Carrying Amount		Fair Value		Carrying Amount		Fair Value		Input
		(in millions)				(in millions)
	Balance Sheet Classification
	Cash equivalents	$	29	$	29	$	35.3	$	35.3	Level 1
	Other accrued expenses
	Currency forward contracts	8.3		8.3		8.3		8.3		Level 2
	Other long-term liabilities
	Currency forward contracts	0.3		0.3		0.1		0.1		Level 2
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]	We estimated the fair value of the amounts outstanding on our debt using available market information and other observable data, to be as follows:
		March 31, 2015				December 31, 2014
		Carrying  Amount		Fair Value		Carrying  Amount		Fair Value
										Input
		(in millions)				(in millions)
	Revolving Credit Facility	$	—	$	—	$	—	$	—	Level 2
	Term Facility	140.6		139.2		142.5		141.1		Level 2
	7.75% Notes	200		227		200		224		Level 2
	6.625% Notes	550		589.2		550		583		Level 2
	6.25% Notes	400		422		400		419		Level 2
	5.125% Notes	200		205.2		200		202.6		Level 2

Derivatives_Tables

Derivatives (Tables)	3 Months Ended
	Mar. 31, 2015
Derivatives and Risk Management [Abstract]
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block]	The following table summarizes the reclassification of pre-tax derivative losses into net income from accumulated other comprehensive income (loss):
		Location of	Loss Reclassified During					Loss Expected to
		Loss	Three Months Ended					be Reclassified
		Reclassified into	March 31,					During the
		Net Income	2015			2014		Next 12 Months
			(in millions)
	Currency forward contracts	Cost of Goods Sold	$	(1.5	)	$	—	$	(7.6	)

Employee_Benefit_Plans_Tables

Employee Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2015
Employee Benefit Plans [Abstract]
Schedule of Net Benefit Costs [Table Text Block]	The components of net periodic benefit cost (credit) are as follows:
		Pension Benefits
		Three Months Ended
		March 31,
		2015			2014
		(in millions)
	Service cost	$	0.8		$	0.9
	Interest cost	7.2			9
	Expected asset return	(10.6		)	(12.1		)
	Amortized loss	1.7			1.3
	Net periodic benefit credit	$	(0.9	)	$	(0.9	)
		Other Postretirement Benefits
		Three Months Ended
		March 31,
		2015			2014
		(in millions)
	Service cost	$	0.1		$	0.1
	Interest cost	3.8			3.8
	Amortized loss	0.2			0.2
	Amortized prior service credit	(0.7		)	(0.7		)
	Net periodic benefit cost	$	3.4		$	3.4

Product_Warranties_Tables

Product Warranties (Tables)	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies [Abstract]
Schedule of Product Warranty Liability [Table Text Block]	The following table provides a reconciliation of changes in the product warranty liability:
		Three Months Ended
		March 31,
		2015			2014
		(in millions)
	Beginning balance	$	12.4		$	14.3
	Accruals	4.5			4.2
	Settlements	(0.2		)	(0.8		)
	Adjustment to prior period accruals, net	1.4			0.2
	Foreign currency translation	(0.2		)	0.1
	Ending balance	$	17.9		$	18

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings (Loss) per Share (EPS) [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	The following table sets forth the computation of our basic and diluted EPS available to shareholders of common stock (excluding participating securities):
		Three Months Ended
		March 31,
		2015			2014
		(in millions, except per share data)
	Numerator
	Net income	$	53.2		$	33.6
	Less: Net income attributable to participating securities	(1.2		)	(0.6		)
	Net income attributable to common shareholders - Basic	$	52		$	33
	Undistributed earnings reallocated to common shareholders under two step	—			—
	dilutive method
	Net income attributable to common shareholders - Dilutive	$	52		$	33
	Denominators
	Basic common shares outstanding -
	Weighted-average shares outstanding	77.5			77
	Less: Participating securities	(1.7		)	(1.4		)
	Weighted-average common shares outstanding	75.8			75.6
	Effect of dilutive securities -
	Dilutive stock-based compensation	0.3			0.1
	Diluted shares outstanding -
	Adjusted weighted-average shares after assumed conversions	76.1			75.7
	Basic EPS	$	0.69		$	0.44
	Diluted EPS	$	0.68		$	0.44

Reclassifications_out_of_Accum1

Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2015
Reclassification Amount from Accumulated Other Comprehensive Income (Loss) [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	Reclassification adjustments and other activity impacting accumulated other comprehensive income (loss) during the three months ended March 31, 2015 and March 31, 2014 are as follows (in millions):
		Defined Benefit Plans				Foreign Currency Translation Adjustments			Unrecognized Loss on Derivatives				Total
	Balance at December 31, 2014	$	(240.6	)		$	(48.9	)	$	(7.4	)		$	(296.9	)
	Other comprehensive income (loss) before reclassifications	3.1			(a)	(31.5		)	(2.0		)		(30.4		)
	Amounts reclassified from accumulated other comprehensive income (loss)	0.8			(a)(b)	—			1.5			(c)	2.3
	Net current period other comprehensive income (loss)	3.9				(31.5		)	(0.5		)		(28.1		)
	Balance at March 31, 2015	$	(236.7	)		$	(80.4	)	$	(7.9	)		$	(325.0	)
		Defined Benefit Plans				Foreign Currency Translation Adjustments			Unrecognized Loss on Derivatives				Total
	Balance at December 31, 2013	$	(197.9	)		$	(18.6	)	$	0.3			$	(216.2	)
	Other comprehensive income before reclassifications	4.5			(a)	7.8			0.9				13.2
	Amounts reclassified from accumulated other comprehensive income (loss)	0.6			(a)(b)	—			—			(c)	0.6
	Net current period other comprehensive income	5.1				7.8			0.9				13.8
	Balance at March 31, 2014	$	(192.8	)		$	(10.8	)	$	1.2			$	(202.4	)
	(a)	The amounts are net of tax of $(1.6) million and $(0.4) million for other comprehensive income before reclassifications and the amounts reclassified from AOCI, respectively, for the three months ended March 31, 2015, and $(2.5) million and $(0.2) million, respectively, for the three months ended March 31, 2014.
	(b)	The net amount reclassified from AOCI included $0.9 million in cost of goods sold (COGS) and $(0.1) million in selling, general & administrative expenses (SG&A) for the three months ended March 31, 2015 and $0.8 million in COGS and $(0.2) million in SG&A for the three months ended March 31, 2014.
	(c)	The amounts reclassified from AOCI are included in COGS.

Supplemental_Guarantor_Condens1

Supplemental Guarantor Condensed Consolidating Financial Statements (Tables)	3 Months Ended
	Mar. 31, 2015
Supplemental Guarantor Condensed Consolidating Financial Statements [Abstract]
Supplemental Guarantor Consolidating Income Statement [Table Text Block]
		Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
	2014
	Net sales
	External	$	—		$	227.9		$	58		$	572.9		$	—		$	858.8
	Intercompany	—			2.8			58.1			5.9			(66.8		)	—
	Total net sales	—			230.7			116.1			578.8			(66.8		)	858.8
	Cost of goods sold	—			231.9			99.6			472.2			(66.8		)	736.9
	Gross profit (loss)	—			(1.2		)	16.5			106.6			—			121.9
	Selling, general and administrative expenses	—			48.6			0.1			8.4			—			57.1
	Operating income (loss)	—			(49.8		)	16.4			98.2			—			64.8
	Non-operating income (expense), net	—			(25.8		)	2.7			(1.1		)	—			(24.2		)
	Income (loss) before income taxes	—			(75.6		)	19.1			97.1			—			40.6
	Income tax expense	—			0.4			—			6.6			—			7
	Earnings (loss) from equity in subsidiaries	33.6			54.5			(9.2		)	—			(78.9		)	—
	Net income (loss) before royalties and dividends	33.6			(21.5		)	9.9			90.5			(78.9		)	33.6
	Royalties and dividends	—			55.1			—			(55.1		)	—			—
	Net income after royalties and dividends	33.6			33.6			9.9			35.4			(78.9		)	33.6
	Other comprehensive income	13.8			13.8			7.8			8.9			(30.5		)	13.8
	Comprehensive income	$	47.4		$	47.4		$	17.7		$	44.3		$	(109.4	)	$	47.4
	Condensed Consolidating Statements of Income
	Three Months Ended March 31,
	(in millions)
		Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
	2015
	Net sales
	External	$	—		$	274.9		$	57.2		$	637		$	—		$	969.1
	Intercompany	—			3.1			64.4			4.6			(72.1		)	—
	Total net sales	—			278			121.6			641.6			(72.1		)	969.1
	Cost of goods sold	—			270.9			100.7			516.8			(72.1		)	816.3
	Gross profit	—			7.1			20.9			124.8			—			152.8
	Selling, general and administrative expenses	—			59.5			—			9			—			68.5
	Operating income (loss)	—			(52.4		)	20.9			115.8			—			84.3
	Non-operating income (expense), net	—			(25.4		)	2.3			1.2			—			(21.9		)
	Income (loss) before income taxes	—			(77.8		)	23.2			117			—			62.4
	Income tax expense (benefit)	—			4.5			(0.4		)	5.1			—			9.2
	Earnings (loss) from equity in subsidiaries	53.2			74.9			(6.0		)	—			(122.1		)	—
	Net income (loss) before royalties and dividends	53.2			(7.4		)	17.6			111.9			(122.1		)	53.2
	Royalties and dividends	—			60.6			—			(60.6		)	—			—
	Net income after royalties and dividends	53.2			53.2			17.6			51.3			(122.1		)	53.2
	Other comprehensive loss	(28.1		)	(28.1		)	(27.0		)	(28.7		)	83.8			(28.1		)
	Comprehensive income (loss)	$	25.1		$	25.1		$	(9.4	)	$	22.6		$	(38.3	)	$	25.1
Supplemental Guarantor Consolidating Balance Sheet [Table Text Block]
		Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
	December 31, 2014
	Assets
	Current assets
	Cash and cash equivalents	$	—		$	69.7		$	—		$	179.5		$	—		$	249.2
	Accounts receivable, net	—			137.5			23.9			371.3			—			532.7
	Intercompany receivables	—			231			174.1			10			(415.1		)	—
	Inventories, net	—			64.9			32.3			151.6			—			248.8
	Other current assets	—			53.6			2.6			52.6			—			108.8
	Total current assets	—			556.7			232.9			765			(415.1		)	1,139.50
	Property, plant and equipment, net	—			230			87.9			743.2			—			1,061.10
	Goodwill	—			—			147.9			7.1			—			155
	Intercompany notes and accounts receivable	—			509.4			219.1			—			(728.5		)	—
	Other assets and deferred charges	—			736.6			45.7			121.3			—			903.6
	Investment in subsidiaries	433.8			1,134.60			—			—			(1,568.4		)	—
	Total assets	$	433.8		$	3,167.30		$	733.5		$	1,636.60		$	(2,712.0	)	$	3,259.20
	Liabilities and stockholders’ equity
	Current liabilities
	Current portion of long-term debt	$	—		$	9.4		$	—		$	3.6		$	—		$	13
	Accounts payable	—			127.3			38.9			278.1			—			444.3
	Intercompany payables	—			177			105.3			132.8			(415.1		)	—
	Other current liabilities	—			121			4.4			104.5			—			229.9
	Total current liabilities	—			434.7			148.6			519			(415.1		)	687.2
	Intercompany notes and accounts payable	320.4			6.9			—			401.2			(728.5		)	—
	Long-term debt	—			1,483.10			4.9			35.4			—			1,523.40
	Investment in subsidiaries obligation	—			—			53.8			—			(53.8		)	—
	Other long-term liabilities	—			808.8			0.6			125.8			—			935.2
	Total liabilities	320.4			2,733.50			207.9			1,081.40			(1,197.4		)	3,145.80
	Total stockholders’ equity	113.4			433.8			525.6			555.2			(1,514.6		)	113.4
	Total liabilities and stockholders’ equity	$	433.8		$	3,167.30		$	733.5		$	1,636.60		$	(2,712.0	)	$	3,259.20
	Condensed Consolidating Balance Sheets
	(in millions)
		Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
	March 31, 2015
	Assets
	Current assets
	Cash and cash equivalents	$	—		$	80.1		$	—		$	125.6		$	—		$	205.7
	Accounts receivable, net	—			165.9			30.4			471.7			—			668
	Intercompany receivables	—			212.7			194.7			9.4			(416.8		)	—
	Inventories, net	—			67.4			31.7			139.4			—			238.5
	Other current assets	—			55.3			2.5			54			—			111.8
	Total current assets	—			581.4			259.3			800.1			(416.8		)	1,224.00
	Property, plant and equipment, net	—			224.8			86.9			728.3			—			1,040.00
	Goodwill	—			—			147.9			6.4			—			154.3
	Intercompany notes and accounts receivable	—			489.9			226			—			(715.9		)	—
	Other assets and deferred charges	—			719.8			47			122.7			—			889.5
	Investment in subsidiaries	463.1			1,173.80			—			—			(1,636.9		)	—
	Total assets	$	463.1		$	3,189.70		$	767.1		$	1,657.50		$	(2,769.6	)	$	3,307.80
	Liabilities and stockholders’ equity
	Current liabilities
	Current portion of long-term debt	$	—		$	10.3		$	—		$	3.6		$	—		$	13.9
	Accounts payable	—			143.1			45.8			300.9			—			489.8
	Intercompany payables	—			191			114.9			110.9			(416.8		)	—
	Other current liabilities	—			108.4			5.2			114.7			—			228.3
	Total current liabilities	—			452.8			165.9			530.1			(416.8		)	732
	Intercompany notes and accounts payable	320.8			6.9			—			388.2			(715.9		)	—
	Long-term debt	—			1,480.30			4.9			35.6			—			1,520.80
	Investment in subsidiaries obligation	—			—			83.6			—			(83.6		)	—
	Other long-term liabilities	—			786.6			0.7			125.4			—			912.7
	Total liabilities	320.8			2,726.60			255.1			1,079.30			(1,216.3		)	3,165.50
	Total stockholders’ equity	142.3			463.1			512			578.2			(1,553.3		)	142.3
	Total liabilities and stockholders’ equity	$	463.1		$	3,189.70		$	767.1		$	1,657.50		$	(2,769.6	)	$	3,307.80
Supplemental Guarantor Consolidating Statement of Cash Flows [Table Text Block]
		Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
	2014
	Net cash provided by (used in) operating activities	$	—		$	(25.8	)	$	14.8		$	(44.5	)	$	—		$	(55.5	)
	Investing activities
	Purchases of property, plant and equipment	—			(9.3		)	(2.7		)	(35.9		)	—			(47.9		)
	Proceeds from sale of property, plant and equipment	—			7.7			—			0.2			—			7.9
	Intercompany activity	—			—			(12.0		)	—			12			—
	Net cash used in investing activities	—			(1.6		)	(14.7		)	(35.7		)	12			(40.0		)
	Financing activities
	Net debt activity	—			(0.1		)	(0.1		)	20.8			—			20.6
	Debt issuance costs	—			(0.2		)	—			—			—			(0.2		)
	Employee stock option exercises	—			0.6			—			—			—			0.6
	Purchase of treasury stock	(0.3		)	—			—			—			—			(0.3		)
	Intercompany activity	0.3			(0.3		)	—			12			(12.0		)	—
	Net cash provided by (used in) financing activities	—			—			(0.1		)	32.8			(12.0		)	20.7
	Effect of exchange rate changes on cash	—			—			—			0.4			—			0.4
	Net decrease in cash and cash equivalents	—			(27.4		)	—			(47.0		)	—			(74.4		)
	Cash and cash equivalents at beginning of period	—			36.9			—			117.1			—			154
	Cash and cash equivalents at end of period	$	—		$	9.5		$	—		$	70.1		$	—		$	79.6
	Condensed Consolidating Statements of Cash Flows
	Three Months Ended March 31,
	(in millions)
		Holdings			AAM Inc.			Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Elims			Consolidated
	2015
	Net cash provided by (used in) operating activities	$	—		$	19.7		$	11.2		$	(24.5	)	$	—		$	6.4
	Investing activities
	Purchases of property, plant and equipment	—			(7.5		)	(2.1		)	(34.0		)	—			(43.6		)
	Proceeds from sale of property, plant and equipment	—			0.1			—			—			—			0.1
	Intercompany activity	—			—			(9.0		)	—			9			—
	Net cash used in investing activities	—			(7.4		)	(11.1		)	(34.0		)	9			(43.5		)
	Financing activities
	Net debt activity	—			(2.0		)	(0.1		)	0.9			—			(1.2		)
	Employee stock option exercises	—			0.4			—			—			—			0.4
	Purchase of treasury stock	(0.3		)	—			—			—			—			(0.3		)
	Intercompany activity	0.3			(0.3		)	—			9			(9.0		)	—
	Net cash provided by (used in) financing activities	—			(1.9		)	(0.1		)	9.9			(9.0		)	(1.1		)
	Effect of exchange rate changes on cash	—			—			—			(5.3		)	—			(5.3		)
	Net increase (decrease) in cash and cash equivalents	—			10.4			—			(53.9		)	—			(43.5		)
	Cash and cash equivalents at beginning of period	—			69.7			—			179.5			—			249.2
	Cash and cash equivalents at end of period	$	—		$	80.1		$	—		$	125.6		$	—		$	205.7

Organization_and_Basis_of_Pres2

Organization and Basis of Presentation Effect of New Accounting Standards (Details) (USD $)	Dec. 31, 2015
In Millions, unless otherwise specified
Effect of New Accounting Standards [Abstract]
Quantitative Effect of New Accounting Standard - Debt Issuance Costs	$15.50

Inventories_Details

Inventories (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Raw materials and work-in-progress	$234.20	$243.80
Finished goods	32.6	32.9
Gross inventories	266.8	276.7
Inventory valuation reserves	-28.3	-27.9
Inventories, net	$238.50	$248.80

LongTerm_Debt_Details

Long-Term Debt (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Debt, Long-term and Short-term, Combined Amount	$1,534.70		$1,536.40
Current portion of long-term debt	13.9		13
Long-term debt	1,520.80		1,523.40
Long-term debt, weighted average interest rate	6.40%		6.40%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	0		0
Line of credit facility, maximum borrowing capacity	523.5
Line of credit facility, remaining borrowing capacity	505.5
Secured Debt [Member] | Term Facility [Member]
Debt Instrument [Line Items]
Notes payable	140.6		142.5
Debt Instrument, Periodic Payment, Principal	1.9	1.9
Unsecured Debt [Member] | 7.75% Notes [Member]
Debt Instrument [Line Items]
Notes payable	200		200
Unsecured Debt [Member] | 6.625% Notes [Member]
Debt Instrument [Line Items]
Notes payable	550		550
Unsecured Debt [Member] | 6.25% Notes [Member]
Debt Instrument [Line Items]
Notes payable	400		400
Unsecured Debt [Member] | 5.125% Notes [Member]
Debt Instrument [Line Items]
Notes payable	200		200
Foreign Credit Facilities [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	39.2		38.9
Notes payable	39.2
Debt instrument, unused borrowing capacity, amount	46.2
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Capital lease obligations	4.9		5
Class D [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, standby letters of credit issued against the facility	$18

Fair_Value_of_Assets_and_Liabi

Fair Value of Assets and Liabilities Measured on a Recurring Basis (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents, at carrying value	$29	$35.30
Portion at Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents, at fair value	29	35.3
Accrued Liabilities [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts, Liability, Fair Value Disclosure	8.3	8.3
Accrued Liabilities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts, Liability, Fair Value Disclosure	8.3	8.3
Other Noncurrent Liabilities [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts, Liability, Fair Value Disclosure	0.3	0.1
Other Noncurrent Liabilities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts, Liability, Fair Value Disclosure	$0.30	$0.10

Fair_Value_of_Debt_Details

Fair Value of Debt (Details) (Fair Value, Inputs, Level 2 [Member], USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Revolving Credit Facility [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	$0	$0
Revolving Credit Facility [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	0	0
Term Facility [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	140.6	142.5
Term Facility [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	139.2	141.1
7.75% Notes [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	200	200
7.75% Notes [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	227	224
6.625% Notes [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	550	550
6.625% Notes [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	589.2	583
6.25% Notes [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	400	400
6.25% Notes [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	422	419
5.125% Notes [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	200	200
5.125% Notes [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	$205.20	$202.60

Derivatives_Details

Derivatives (Details) (Forward Contracts [Member], USD $)	3 Months Ended		12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	$108.20
Cost of Sales [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments, income statement location of loss reclassified from accumulated OCI	Cost of Goods Sold
Derivative instruments, loss reclassified from accumulated OCI into income, effective portion, net	-1.5	0
Cash flow hedge loss to be reclassified within twelve months			($7.60)

Employee_Benefit_Plans_Compone

Employee Benefit Plans Components of Net Periodic Benefit Cost (Credit) (Details) (USD $)	3 Months Ended		12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2015
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$0.80	$0.90
Interest cost	7.2	9
Expected asset return	-10.6	-12.1
Amortized loss	1.7	1.3
Net periodic benefit credit	-0.9	-0.9
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.1	0.1
Interest cost	3.8	3.8
Amortized loss	0.2	0.2
Amortized prior service credit	-0.7	-0.7
Net periodic benefit cost	3.4	3.4
Scenario, Forecast [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, estimated future employer contributions in current fiscal year			$16

Product_Warranties_Details

Product Warranties (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Product Warranty Rollforward
Beginning balance	$12.40	$14.30
Accruals	4.5	4.2
Settlements	-0.2	-0.8
Adjustments to prior period accruals, net	1.4	0.2
Foreign currency translation	-0.2	0.1
Ending balance	$17.90	$18

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Income tax expense	$9.20	$7
Effective income tax rate, continuing operations	14.80%	17.30%
Income tax benefit	1
Unrecognized tax benefit liability, including penalties and accrued interest	$60.80		$59.50

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Numerator
Net income	$53.20	$33.60
Less: Net income attributable to participating securities	-1.2	-0.6
Net income attributable to common shareholders - Basic	52	33
Undistributed earnings reallocated to common shareholders under two step dilutive method	0	0
Net income attributable to common shareholders - Dilutive	$52	$33
Denominator
Basic - Weighted-average shares outstanding	77.5	77
Basic - Less: Participating securities	-1.7	-1.4
Basic - Weighted-average common shares outstanding	75.8	75.6
Effect of dilutive securities - dilutive stock-based compensation	0.3	0.1
Diluted - Adjusted weighted-average shares after assumed conversions	76.1	75.7
Basic EPS	$0.69	$0.44
Diluted EPS	$0.68	$0.44
Antidilutive securities excluded from computation of earnings per share, amount	0.2	1.1
Earnings per share, range of exercise prices of Stock Options excluded from the calculation of diluted EPS, lower end of range	$26.02	$19.54
Earnings Per Share, Range of Exercise Prices of Stock Options Excluded from the Calculation of Diluted EPS, Upper End of Range	$26.02	$40.83

Reclassifications_out_of_Accum2

Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Defined benefit plans	($236.70)	($192.80)	($240.60)	($197.90)
Defined benefit plans, other comprehensive income (loss), before reclassifications	3.1	4.5
Defined benefit plans, amounts reclassified from accumulated other comprehensive income (loss)	0.8	0.6
Defined benefit plans, net current period other comprehensive income (loss)	3.9	5.1
Foreign currency translation adjustments	-80.4	-10.8	-48.9	-18.6
Foreign currency translation adjustments, other comprehensive income (loss) arising during period, net of tax	-31.5	7.8
Foreign currency translation adjustments, other comprehensive income (loss), reclassification adjustment, net of tax	0	0
Foreign currency translation adjustments	-31.5	7.8
Unrecognized loss on derivatives	-7.9	1.2	-7.4	0.3
Unrecognized gain on derivatives, other comprehensive income (loss) arising during period, net of tax	-2	0.9
Unrecognized gain on derivatives, other comprehensive income (loss), reclassification adjustment, net of tax	1.5	0
Change in derivatives	-0.5	0.9
Accumulated other comprehensive income (loss), net of tax	-325	-202.4	-296.9	-216.2
Other comprehensive income (loss) arising during period, total, net of tax	-30.4	13.2
Other comprehensive income (loss), reclassification adjustments, total, net of tax	2.3	0.6
Other comprehensive income (loss)	-28.1	13.8
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax	-0.4	-0.2
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, before Reclassification Adjustments, Tax	-1.6	-2.5
Cost of Sales [Member]
Defined benefit plans, amounts reclassified from accumulated other comprehensive income (loss)	0.9	0.8
Selling, General and Administrative Expenses [Member]
Defined benefit plans, amounts reclassified from accumulated other comprehensive income (loss)	($0.10)	($0.20)

Supplemental_Guarantor_Condens2

Supplemental Guarantor Condensed Consolidating Statements of Income (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Net sales
External	$969.10	$858.80
Intercompany	0	0
Total net sales	969.1	858.8
Cost of goods sold	816.3	736.9
Gross profit	152.8	121.9
Selling, general and administrative expenses	68.5	57.1
Operating income (loss)	-84.3	-64.8
Non-operating income (expense), net	-21.9	-24.2
Income (loss) before income taxes	62.4	40.6
Income tax expense (benefit)	9.2	7
Earnings (loss) from equity in subsidiaries	0	0
Net income (loss) before royalties and dividends	53.2	33.6
Royalties and dividends	0	0
Net income after royalties and dividends	53.2	33.6
Other comprehensive income (loss)	-28.1	13.8
Comprehensive income (loss)	25.1	47.4
Holdings [Member]
Net sales
External	0	0
Intercompany	0	0
Total net sales	0	0
Cost of goods sold	0	0
Gross profit	0	0
Selling, general and administrative expenses	0	0
Operating income (loss)	0	0
Non-operating income (expense), net	0	0
Income (loss) before income taxes	0	0
Income tax expense (benefit)	0	0
Earnings (loss) from equity in subsidiaries	53.2	33.6
Net income (loss) before royalties and dividends	53.2	33.6
Royalties and dividends	0	0
Net income after royalties and dividends	53.2	33.6
Other comprehensive income (loss)	-28.1	13.8
Comprehensive income (loss)	25.1	47.4
AAM Inc. [Member]
Net sales
External	274.9	227.9
Intercompany	3.1	2.8
Total net sales	278	230.7
Cost of goods sold	270.9	231.9
Gross profit	7.1	-1.2
Selling, general and administrative expenses	59.5	48.6
Operating income (loss)	52.4	49.8
Non-operating income (expense), net	-25.4	-25.8
Income (loss) before income taxes	-77.8	-75.6
Income tax expense (benefit)	4.5	0.4
Earnings (loss) from equity in subsidiaries	74.9	54.5
Net income (loss) before royalties and dividends	-7.4	-21.5
Royalties and dividends	60.6	55.1
Net income after royalties and dividends	53.2	33.6
Other comprehensive income (loss)	-28.1	13.8
Comprehensive income (loss)	25.1	47.4
Guarantor Subsidiaries [Member]
Net sales
External	57.2	58
Intercompany	64.4	58.1
Total net sales	121.6	116.1
Cost of goods sold	100.7	99.6
Gross profit	20.9	16.5
Selling, general and administrative expenses	0	0.1
Operating income (loss)	-20.9	-16.4
Non-operating income (expense), net	2.3	2.7
Income (loss) before income taxes	23.2	19.1
Income tax expense (benefit)	-0.4	0
Earnings (loss) from equity in subsidiaries	-6	-9.2
Net income (loss) before royalties and dividends	17.6	9.9
Royalties and dividends	0	0
Net income after royalties and dividends	17.6	9.9
Other comprehensive income (loss)	-27	7.8
Comprehensive income (loss)	-9.4	17.7
Non-Guarantor Subsidiaries [Member]
Net sales
External	637	572.9
Intercompany	4.6	5.9
Total net sales	641.6	578.8
Cost of goods sold	516.8	472.2
Gross profit	124.8	106.6
Selling, general and administrative expenses	9	8.4
Operating income (loss)	-115.8	-98.2
Non-operating income (expense), net	1.2	-1.1
Income (loss) before income taxes	117	97.1
Income tax expense (benefit)	5.1	6.6
Earnings (loss) from equity in subsidiaries	0	0
Net income (loss) before royalties and dividends	111.9	90.5
Royalties and dividends	-60.6	-55.1
Net income after royalties and dividends	51.3	35.4
Other comprehensive income (loss)	-28.7	8.9
Comprehensive income (loss)	22.6	44.3
Elims [Member]
Net sales
External	0	0
Intercompany	-72.1	-66.8
Total net sales	-72.1	-66.8
Cost of goods sold	-72.1	-66.8
Gross profit	0	0
Selling, general and administrative expenses	0	0
Operating income (loss)	0	0
Non-operating income (expense), net	0	0
Income (loss) before income taxes	0	0
Income tax expense (benefit)	0	0
Earnings (loss) from equity in subsidiaries	-122.1	-78.9
Net income (loss) before royalties and dividends	-122.1	-78.9
Royalties and dividends	0	0
Net income after royalties and dividends	-122.1	-78.9
Other comprehensive income (loss)	83.8	-30.5
Comprehensive income (loss)	($38.30)	($109.40)

Supplemental_Guarantor_Condens3

Supplemental Guarantor Condensed Consolidating Balance Sheets (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Current Assets
Cash and cash equivalents	$205.70	$249.20	$79.60	$154
Accounts receivable, net	668	532.7
Intercompany receivables	0	0
Inventories, net	238.5	248.8
Other current assets	111.8	108.8
Total current assets	1,224	1,139.50
Property, plant and equipment, net	1,040	1,061.10
Goodwill	154.3	155
Intercompany notes and accounts receivable	0	0
Other assets and deferred charges	889.5	903.6
Investment in subsidiaries	0	0
Total assets	3,307.80	3,259.20
Current Liabilities
Current portion of long-term debt	13.9	13
Accounts payable	489.8	444.3
Intercompany payables	0	0
Other current liabilities	228.3	229.9
Total current liabilities	732	687.2
Intercompany notes and accounts payable	0	0
Long-term debt	1,520.80	1,523.40
Investment in subsidiaries obligation	0	0
Other long-term liabilities	912.7	935.2
Total liabilities	3,165.50	3,145.80
Total stockholders’ equity	142.3	113.4
Total liabilities and stockholders' equity	3,307.80	3,259.20
Holdings [Member]
Current Assets
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	0	0
Intercompany receivables	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
Intercompany notes and accounts receivable	0	0
Other assets and deferred charges	0	0
Investment in subsidiaries	463.1	433.8
Total assets	463.1	433.8
Current Liabilities
Current portion of long-term debt	0	0
Accounts payable	0	0
Intercompany payables	0	0
Other current liabilities	0	0
Total current liabilities	0	0
Intercompany notes and accounts payable	320.8	320.4
Long-term debt	0	0
Investment in subsidiaries obligation	0	0
Other long-term liabilities	0	0
Total liabilities	320.8	320.4
Total stockholders’ equity	142.3	113.4
Total liabilities and stockholders' equity	463.1	433.8
AAM Inc. [Member]
Current Assets
Cash and cash equivalents	80.1	69.7	9.5	36.9
Accounts receivable, net	165.9	137.5
Intercompany receivables	212.7	231
Inventories, net	67.4	64.9
Other current assets	55.3	53.6
Total current assets	581.4	556.7
Property, plant and equipment, net	224.8	230
Goodwill	0	0
Intercompany notes and accounts receivable	489.9	509.4
Other assets and deferred charges	719.8	736.6
Investment in subsidiaries	1,173.80	1,134.60
Total assets	3,189.70	3,167.30
Current Liabilities
Current portion of long-term debt	10.3	9.4
Accounts payable	143.1	127.3
Intercompany payables	191	177
Other current liabilities	108.4	121
Total current liabilities	452.8	434.7
Intercompany notes and accounts payable	6.9	6.9
Long-term debt	1,480.30	1,483.10
Investment in subsidiaries obligation	0	0
Other long-term liabilities	786.6	808.8
Total liabilities	2,726.60	2,733.50
Total stockholders’ equity	463.1	433.8
Total liabilities and stockholders' equity	3,189.70	3,167.30
Guarantor Subsidiaries [Member]
Current Assets
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	30.4	23.9
Intercompany receivables	194.7	174.1
Inventories, net	31.7	32.3
Other current assets	2.5	2.6
Total current assets	259.3	232.9
Property, plant and equipment, net	86.9	87.9
Goodwill	147.9	147.9
Intercompany notes and accounts receivable	226	219.1
Other assets and deferred charges	47	45.7
Investment in subsidiaries	0	0
Total assets	767.1	733.5
Current Liabilities
Current portion of long-term debt	0	0
Accounts payable	45.8	38.9
Intercompany payables	114.9	105.3
Other current liabilities	5.2	4.4
Total current liabilities	165.9	148.6
Intercompany notes and accounts payable	0	0
Long-term debt	4.9	4.9
Investment in subsidiaries obligation	83.6	53.8
Other long-term liabilities	0.7	0.6
Total liabilities	255.1	207.9
Total stockholders’ equity	512	525.6
Total liabilities and stockholders' equity	767.1	733.5
Non-Guarantor Subsidiaries [Member]
Current Assets
Cash and cash equivalents	125.6	179.5	70.1	117.1
Accounts receivable, net	471.7	371.3
Intercompany receivables	9.4	10
Inventories, net	139.4	151.6
Other current assets	54	52.6
Total current assets	800.1	765
Property, plant and equipment, net	728.3	743.2
Goodwill	6.4	7.1
Intercompany notes and accounts receivable	0	0
Other assets and deferred charges	122.7	121.3
Investment in subsidiaries	0	0
Total assets	1,657.50	1,636.60
Current Liabilities
Current portion of long-term debt	3.6	3.6
Accounts payable	300.9	278.1
Intercompany payables	110.9	132.8
Other current liabilities	114.7	104.5
Total current liabilities	530.1	519
Intercompany notes and accounts payable	388.2	401.2
Long-term debt	35.6	35.4
Investment in subsidiaries obligation	0	0
Other long-term liabilities	125.4	125.8
Total liabilities	1,079.30	1,081.40
Total stockholders’ equity	578.2	555.2
Total liabilities and stockholders' equity	1,657.50	1,636.60
Elims [Member]
Current Assets
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	0	0
Intercompany receivables	-416.8	-415.1
Inventories, net	0	0
Other current assets	0	0
Total current assets	-416.8	-415.1
Property, plant and equipment, net	0	0
Goodwill	0	0
Intercompany notes and accounts receivable	-715.9	-728.5
Other assets and deferred charges	0	0
Investment in subsidiaries	-1,636.90	-1,568.40
Total assets	-2,769.60	-2,712
Current Liabilities
Current portion of long-term debt	0	0
Accounts payable	0	0
Intercompany payables	-416.8	-415.1
Other current liabilities	0	0
Total current liabilities	-416.8	-415.1
Intercompany notes and accounts payable	-715.9	-728.5
Long-term debt	0	0
Investment in subsidiaries obligation	-83.6	-53.8
Other long-term liabilities	0	0
Total liabilities	-1,216.30	-1,197.40
Total stockholders’ equity	-1,553.30	-1,514.60
Total liabilities and stockholders' equity	($2,769.60)	($2,712)

Supplemental_Guarantor_Condens4

Supplemental Guarantor Condensed Consolidating Statements of Cash Flows (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Net cash provided by (used in) operating activities	$6.40	($55.50)
Investing activities
Purchases of property, plant and equipment	-43.6	-47.9
Proceeds from sale of property, plant and equipment	0.1	7.9
Intercompany Activity	0	0
Net cash used in investing activities	-43.5	-40
Financing Activities
Net debt activity	-1.2	20.6
Debt issuance costs	0	-0.2
Employee stock option exercises	0.4	0.6
Purchase of treasury stock	-0.3	-0.3
Intercompany Activity	0	0
Net cash provided by (used in) financing activities	-1.1	20.7
Effect of exchange rate changes on cash	-5.3	0.4
Net increase (decrease) in cash and cash equivalents	43.5	74.4
Cash and cash equivalents at beginning of period	249.2	154
Cash and cash equivalents at end of period	205.7	79.6
Holdings [Member]
Net cash provided by (used in) operating activities	0	0
Investing activities
Purchases of property, plant and equipment	0	0
Proceeds from sale of property, plant and equipment	0	0
Intercompany Activity	0	0
Net cash used in investing activities	0	0
Financing Activities
Net debt activity	0	0
Debt issuance costs		0
Employee stock option exercises	0	0
Purchase of treasury stock	-0.3	-0.3
Intercompany Activity	0.3	0.3
Net cash provided by (used in) financing activities	0	0
Effect of exchange rate changes on cash	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
AAM Inc. [Member]
Net cash provided by (used in) operating activities	19.7	-25.8
Investing activities
Purchases of property, plant and equipment	-7.5	-9.3
Proceeds from sale of property, plant and equipment	0.1	7.7
Intercompany Activity	0	0
Net cash used in investing activities	-7.4	-1.6
Financing Activities
Net debt activity	-2	-0.1
Debt issuance costs		-0.2
Employee stock option exercises	0.4	0.6
Purchase of treasury stock	0	0
Intercompany Activity	-0.3	-0.3
Net cash provided by (used in) financing activities	-1.9	0
Effect of exchange rate changes on cash	0	0
Net increase (decrease) in cash and cash equivalents	-10.4	27.4
Cash and cash equivalents at beginning of period	69.7	36.9
Cash and cash equivalents at end of period	80.1	9.5
Guarantor Subsidiaries [Member]
Net cash provided by (used in) operating activities	11.2	14.8
Investing activities
Purchases of property, plant and equipment	-2.1	-2.7
Proceeds from sale of property, plant and equipment	0	0
Intercompany Activity	-9	-12
Net cash used in investing activities	-11.1	-14.7
Financing Activities
Net debt activity	-0.1	-0.1
Debt issuance costs		0
Employee stock option exercises	0	0
Purchase of treasury stock	0	0
Intercompany Activity	0	0
Net cash provided by (used in) financing activities	-0.1	-0.1
Effect of exchange rate changes on cash	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
Non-Guarantor Subsidiaries [Member]
Net cash provided by (used in) operating activities	-24.5	-44.5
Investing activities
Purchases of property, plant and equipment	-34	-35.9
Proceeds from sale of property, plant and equipment	0	0.2
Intercompany Activity	0	0
Net cash used in investing activities	-34	-35.7
Financing Activities
Net debt activity	0.9	20.8
Debt issuance costs		0
Employee stock option exercises	0	0
Purchase of treasury stock	0	0
Intercompany Activity	9	12
Net cash provided by (used in) financing activities	9.9	32.8
Effect of exchange rate changes on cash	-5.3	0.4
Net increase (decrease) in cash and cash equivalents	53.9	47
Cash and cash equivalents at beginning of period	179.5	117.1
Cash and cash equivalents at end of period	125.6	70.1
Elims [Member]
Net cash provided by (used in) operating activities	0	0
Investing activities
Purchases of property, plant and equipment	0	0
Proceeds from sale of property, plant and equipment	0	0
Intercompany Activity	9	12
Net cash used in investing activities	9	12
Financing Activities
Net debt activity	0	0
Debt issuance costs		0
Employee stock option exercises	0	0
Purchase of treasury stock	0	0
Intercompany Activity	-9	-12
Net cash provided by (used in) financing activities	-9	-12
Effect of exchange rate changes on cash	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	$0	$0