American Axle & Manufacturing (AXL) 10-Q 4 Nov 22 2022 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2022	Nov. 01, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2022
Document Transition Report	false
Entity File Number	1-14303
Entity Registrant Name	AMERICAN AXLE & MANUFACTURING HOLDINGS, INC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	38-3161171
Entity Address, Address Line One	One Dauch Drive
Entity Address, City or Town	Detroit
Entity Address, State or Province	MI
Entity Address, Postal Zip Code	48211-1198
City Area Code	313
Local Phone Number	758-2000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	AXL
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding (in shares)		114,554,229
Entity Central Index Key	0001062231
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Amendment Flag	false

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net sales	$ 1,535.2	$ 1,213.1	$ 4,409.7	$ 3,921.5
Cost of goods sold	1,357.8	1,047.5	3,872	3,338.8
Gross profit	177.4	165.6	537.7	582.7
Selling, general and administrative expenses	85.7	90.5	256.6	266.7
Amortization of intangible assets	21.5	21.4	64.4	64.3
Restructuring and acquisition-related costs	7.9	7.4	26.4	40.8
Loss on sale of business	0	0	0	2.7
Operating income	62.3	46.3	190.3	208.2
Interest expense	(44.8)	(49.7)	(132.2)	(150.7)
Interest income	5.4	2.7	11.6	8.2
Debt refinancing and redemption costs	(0.2)	(31.6)	(6)	(34)
Gain on bargain purchase of business	1.4	0	13	0
Unrealized gain (loss) on equity securities	(2.3)	19.4	(24)	19.4
Other expense, net	(1)	(3.1)	(4.4)	(1.3)
Income (loss) before income taxes	20.8	(16)	48.3	49.8
Income tax benefit	(5.7)	(13.6)	(2.1)	(2.4)
Net income (loss)	$ 26.5	$ (2.4)	$ 50.4	$ 52.2
Basic earnings (loss) per share	$ 0.22	$ (0.02)	$ 0.42	$ 0.44
Diluted earnings (loss) per share	$ 0.22	$ (0.02)	$ 0.42	$ 0.44

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net income (loss)		$ 26.5	$ (2.4)	$ 50.4	$ 52.2
Other comprehensive income (loss)
Defined benefit plans, net of tax	[1]	1.5	2.2	4.1	6.5
Foreign currency translation adjustments		(34.4)	(9.6)	(70.7)	(8.4)
Changes in cash flow hedges, net of tax	[2]	19.1	(1.8)	33.1	3
Other comprehensive income (loss)		(13.8)	(9.2)	(33.5)	1.1
Comprehensive income (loss)		$ 12.7	$ (11.6)	$ 16.9	$ 53.3
[1]Amounts are net of tax of $(0.4) million and $(1.4) million for the three and nine months ended September 30, 2022, and $(0.6) million and $(1.7) million for the three and nine months ended September 30, 2021, respectively.[2]Amounts are net of tax of $(4.9) million and $(7.6) million for the three and nine months ended September 30, 2022, and $(0.7) million and $(2.7) million for the three and nine months ended September 30, 2021, respectively.

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Other comprehensive income (loss), pension and other postretirement benefit plans, tax	$ (0.4)	$ (0.6)	$ (1.4)	$ (1.7)
Other comprehensive income (loss), derivatives qualifying as hedges, tax	$ (4.9)	$ (0.7)	$ (7.6)	$ (2.7)

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 472.3	$ 530.2
Accounts receivable, net	974.6	762.8
Inventories, net	446.8	410.4
Prepaid expenses and other	161.8	152.6
Total current assets	2,055.5	1,856
Property, plant and equipment, net	1,905.3	1,996.1
Deferred income taxes	135.7	121.1
Goodwill	179.3	183.8
Other intangible assets, net	636.2	697.2
GM postretirement cost sharing asset	200.2	201.1
Operating lease right-of-use assets	111.8	123.7
Other assets and deferred charges	455.6	456.7
Total assets	5,679.6	5,635.7
Current liabilities
Current portion of long-term debt	19.2	18.8
Accounts payable	779.6	612.8
Accrued compensation and benefits	202.1	195.2
Deferred revenue	29.2	28.1
Current portion of operating lease liabilities	23.2	24.6
Accrued expenses and other	161	160.4
Total current liabilities	1,214.3	1,039.9
Long-term debt, net	2,974.1	3,085.7
Deferred revenue	70.1	94.8
Deferred income taxes	14.9	13.5
Long-term portion of operating lease liabilities	89.6	99.9
Postretirement benefits and other long-term liabilities	830.1	844.1
Total liabilities	5,193.1	5,177.9
Stockholders' equity
Common stock, par value $0.01 per share; 150.0 million shares authorized; 123.2 million shares issued as of September 30, 2022 and 122.5 million shares issued as of December 31, 2021	1.3	1.3
Paid-in capital	1,365.2	1,351.5
Accumulated deficit	(263.5)	(313.9)
Treasury stock at cost, 8.7 million shares as of September 30, 2022 and 8.5 million shares as of December 31, 2021	(218.2)	(216.3)
Accumulated other comprehensive income (loss)
Defined benefit plans, net of tax	(237.8)	(241.9)
Foreign currency translation adjustments	(182)	(111.3)
Unrecognized gain (loss) on cash flow hedges, net of tax	21.5	(11.6)
Total stockholders' equity	486.5	457.8
Total liabilities and stockholders' equity	$ 5,679.6	$ 5,635.7

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Millions	Sep. 30, 2022	Dec. 31, 2021
Common stock, par or stated value per share	$ 0.01	$ 0.01
Common stock, shares authorized	150	150
Common stock, shares, issued	123.2	122.5
Treasury stock, shares	8.7	8.5

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Net income	$ 50.4	$ 52.2
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	367.1	421.2
Deferred income taxes	(13.2)	(17.1)
Stock-based compensation	13.7	13.2
Pensions and other postretirement benefits, net of contributions	(7)	(9.3)
Loss on sale of business	0	2.7
Loss (gain) on disposal of property, plant and equipment, net	(1.8)	2.1
Unrealized loss (gain) on equity securities	24	(19.4)
Gain on bargain purchase of business	(13)	0
Debt refinancing and redemption costs	6	34
Changes in operating assets and liabilities
Accounts receivable	(205.5)	46.7
Inventories	(11.9)	(94.1)
Accounts payable and accrued expenses	167.1	37
Deferred revenue	(13.8)	3.3
Other assets and liabilities	(61.7)	(36.5)
Net cash provided by operating activities	300.4	436
Investing activities
Purchases of property, plant and equipment	(117.9)	(115.8)
Proceeds from sale of property, plant and equipment	4.3	1.8
Proceeds from sale of business, net of cash divested	0	0.9
Acquisition of business, net of cash acquired	(88.3)	(4.9)
Proceeds from insurance claim	6.3	23.1
Other investing activities	(1.8)	0
Net cash used in investing activities	(197.4)	(94.9)
Financing activities
Proceeds from issuance of long-term debt	222	622.7
Payments of long-term debt	(368.8)	(999.9)
Debt issuance costs	(4.4)	(9.2)
Purchase of treasury stock	(1.9)	(4.3)
Other financing activities	5.3	(3.5)
Net cash used in financing activities	(147.8)	(394.2)
Effect of exchange rate changes on cash	(13.1)	(3.2)
Net decrease in cash and cash equivalents	(57.9)	(56.3)
Cash and cash equivalents at beginning of period	530.2	557
Cash and cash equivalents at end of period	472.3	500.7
Supplemental cash flow information
Interest paid	117.4	153.5
Income taxes paid, net	28.5	17.8
Non-cash investing activities: Deferred consideration for acquisition of business	$ 0	$ 10

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions		Total		Common Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Treasury Stock	AOCI Attributable to Parent	Noncontrolling Interest
Common stock, shares, outstanding at Dec. 31, 2020		113.3
Total AAM stockholders' equity at Dec. 31, 2020				$ 1.2	$ 1,333.3	$ (319.8)	$ (212)	$ (432.2)	$ 2.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)						38.6
Net income (loss) attributable to noncontrolling interest									0
Stock issued during period, shares, share-based compensation, net of forfeitures		1
Vesting of restricted stock units and performance shares				0.1
Stock-based compensation					5.3
Treasury stock, shares, acquired		(0.4)
Purchase of treasury stock							(4)
Changes in cash flow hedges, net of tax								(0.3)
Foreign currency translation adjustments								(11)
Defined benefit plans, net of tax								2.1
Loss on sale of business									(2.7)
Common stock, shares, outstanding at Mar. 31, 2021		113.9
Total AAM stockholders' equity at Mar. 31, 2021				1.3	1,338.6	(281.2)	(216)	(441.4)	0
Common stock, shares, outstanding at Dec. 31, 2020		113.3
Total AAM stockholders' equity at Dec. 31, 2020				1.2	1,333.3	(319.8)	(212)	(432.2)	2.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		$ 52.2
Purchase of treasury stock		4.3
Changes in cash flow hedges, net of tax	[1]	3
Foreign currency translation adjustments		(8.4)
Defined benefit plans, net of tax	[2]	$ 6.5
Common stock, shares, outstanding at Sep. 30, 2021		114.1
Total AAM stockholders' equity at Sep. 30, 2021				1.3	1,346.5	(267.6)	(216.3)	(431.1)	0
Common stock, shares, outstanding at Mar. 31, 2021		113.9
Total AAM stockholders' equity at Mar. 31, 2021				1.3	1,338.6	(281.2)	(216)	(441.4)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)						16
Net income (loss) attributable to noncontrolling interest									0
Stock issued during period, shares, share-based compensation, net of forfeitures		0.2
Stock-based compensation					4.7
Treasury stock, shares, acquired		0
Purchase of treasury stock							(0.2)
Changes in cash flow hedges, net of tax								5.1
Foreign currency translation adjustments								12.2
Defined benefit plans, net of tax								2.2
Common stock, shares, outstanding at Jun. 30, 2021		114.1
Total AAM stockholders' equity at Jun. 30, 2021				1.3	1,343.3	(265.2)	(216.2)	(421.9)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		$ (2.4)				(2.4)
Net income (loss) attributable to noncontrolling interest									0
Stock-based compensation					3.2
Treasury stock, shares, acquired		0
Purchase of treasury stock							(0.1)
Changes in cash flow hedges, net of tax		$ (1.8)	[1]					(1.8)
Foreign currency translation adjustments		(9.6)						(9.6)
Defined benefit plans, net of tax		$ 2.2	[2]					2.2
Common stock, shares, outstanding at Sep. 30, 2021		114.1
Total AAM stockholders' equity at Sep. 30, 2021				1.3	1,346.5	(267.6)	(216.3)	(431.1)	0
Common stock, shares, outstanding at Dec. 31, 2021		114
Total AAM stockholders' equity at Dec. 31, 2021		$ 457.8		1.3	1,351.5	(313.9)	(216.3)	(364.8)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)						1
Net income (loss) attributable to noncontrolling interest									0
Stock issued during period, shares, share-based compensation, net of forfeitures		0.7
Vesting of restricted stock units and performance shares				0
Stock-based compensation					4.5
Treasury stock, shares, acquired		(0.2)
Purchase of treasury stock							(1.8)
Changes in cash flow hedges, net of tax								15.7
Foreign currency translation adjustments								6
Defined benefit plans, net of tax								1.3
Common stock, shares, outstanding at Mar. 31, 2022		114.5
Total AAM stockholders' equity at Mar. 31, 2022				1.3	1,356	(312.9)	(218.1)	(341.8)	0
Common stock, shares, outstanding at Dec. 31, 2021		114
Total AAM stockholders' equity at Dec. 31, 2021		$ 457.8		1.3	1,351.5	(313.9)	(216.3)	(364.8)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		50.4
Purchase of treasury stock		1.9
Changes in cash flow hedges, net of tax	[1]	33.1
Foreign currency translation adjustments		(70.7)
Defined benefit plans, net of tax	[2]	$ 4.1
Common stock, shares, outstanding at Sep. 30, 2022		114.5
Total AAM stockholders' equity at Sep. 30, 2022		$ 486.5		1.3	1,365.2	(263.5)	(218.2)	(398.3)	0
Common stock, shares, outstanding at Mar. 31, 2022		114.5
Total AAM stockholders' equity at Mar. 31, 2022				1.3	1,356	(312.9)	(218.1)	(341.8)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)						22.9
Net income (loss) attributable to noncontrolling interest									0
Stock-based compensation					4.6
Treasury stock, shares, acquired		0
Purchase of treasury stock							(0.1)
Changes in cash flow hedges, net of tax								(1.7)
Foreign currency translation adjustments								(42.3)
Defined benefit plans, net of tax								1.3
Common stock, shares, outstanding at Jun. 30, 2022		114.5
Total AAM stockholders' equity at Jun. 30, 2022				1.3	1,360.6	(290)	(218.2)	(384.5)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		$ 26.5				26.5
Net income (loss) attributable to noncontrolling interest									0
Stock-based compensation					4.6
Changes in cash flow hedges, net of tax		19.1	[1]					19.1
Foreign currency translation adjustments		(34.4)						(34.4)
Defined benefit plans, net of tax		$ 1.5	[2]					1.5
Common stock, shares, outstanding at Sep. 30, 2022		114.5
Total AAM stockholders' equity at Sep. 30, 2022		$ 486.5		$ 1.3	$ 1,365.2	$ (263.5)	$ (218.2)	$ (398.3)	$ 0
[1]Amounts are net of tax of $(4.9) million and $(7.6) million for the three and nine months ended September 30, 2022, and $(0.7) million and $(2.7) million for the three and nine months ended September 30, 2021, respectively.[2]Amounts are net of tax of $(0.4) million and $(1.4) million for the three and nine months ended September 30, 2022, and $(0.6) million and $(1.7) million for the three and nine months ended September 30, 2021, respectively.

Organization and Basis of Prese

Organization and Basis of Presentation (Notes)	9 Months Ended
	Sep. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	1. ORGANIZATION AND BASIS OF PRESENTATION Organization As a leading global tier 1 automotive and mobility supplier, AAM designs, engineers and manufactures Driveline and Metal Forming technologies to support electric, hybrid, and internal combustion vehicles. Headquartered in Detroit, with nearly 85 facilities in 18 countries, AAM is bringing the future faster for a safer and more sustainable tomorrow. 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, 2021 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. These estimates and assumptions are impacted by risks and uncertainties, including those associated with COVID-19, the semiconductor supply shortage that is impacting the automotive industry, inflationary pressures, fluctuations in interest and foreign exchange rates, and the conflict between Russia and Ukraine. While we have made estimates and assumptions based on the facts and circumstances available as of the date of this report, the full impact of these matters cannot be predicted, and actual results could differ materially from those estimates and assumptions. 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, 2021. Effect of New Accounting Standards and Other Regulatory Pronouncements Accounting Standard Update 2021-10 On November 17, 2021, the FASB issued ASU 2021-10 - Government Assistance (Topic 832). This guidance established requirements for annual disclosures about certain types of material government assistance, including government grants and tax credits. This guidance became effective and we prospectively adopted this guidance on January 1, 2022. The adoption of this standard did not have a material impact on our condensed consolidated financial statements. Coronavirus Aid, Relief, and Economic Security Act The Coronavirus Aid, Relief, and Economic Security Act (the CARES Act) was enacted on March 27, 2020 in the United States. The key provisions of the CARES Act, as they remain applicable to AAM, include the following: • The ability to use net operating losses (NOLs) to offset income without the 80% taxable income limitation enacted as part of the Tax Cuts and Jobs Act (TCJA) of 2017, and to carry back NOLs to offset prior year income for five years. These are temporary provisions that apply to NOLs incurred in 2018, 2019 or 2020 tax years. We received income tax refunds of $5.4 million and $6.0 million in the first quarter of 2022 and 2021, respectively, as a result of this provision of the CARES Act. • The ability to defer the payment of the employer portion of social security taxes incurred between March 27, 2020 and December 31, 2020, with 50% of the deferred amount paid by December 31, 2021 and the remaining 50% to be paid by December 31, 2022. At September 30, 2022, we had deferred $7.6 million of social security taxes, which are expected to be paid in the fourth quarter of 2022.

Restructuring and Acquisition-R

Restructuring and Acquisition-Related Costs (Notes)	9 Months Ended
	Sep. 30, 2022
Restructuring and Related Activities [Abstract]
Business Acquisition, Integration, Restructuring and Other Related Costs [Text Block]	2. RESTRUCTURING AND ACQUISITION-RELATED COSTS In the first quarter of 2020, we initiated a new global restructuring program (the 2020 Program). The primary objectives of the 2020 Program are to achieve efficiencies within our corporate and business unit support teams to reduce cost in our business, and to structurally adjust our operations to a new level of market demand based on the impact of COVID-19. We expect to incur costs under the 2020 Program through 2022. In the second quarter of 2021, we completed the acquisition of a manufacturing facility in Emporium, Pennsylvania (Emporium), and subsequently determined that we will cease production at the facility in 2022 and relocate the production capacity to other AAM manufacturing facilities. As a result, during the nine months ended September 30, 2022, we incurred restructuring charges related to the anticipated closure of the facility and expect to incur costs associated with the closure of the facility through 2022. A summary of our restructuring activity for the first nine months of 2022 and 2021 is shown below: Severance Charges Implementation Costs Total (in millions) Accrual at December 31, 2020 $ 1.7 $ 9.8 $ 11.5 Charges 2.7 33.2 35.9 Cash utilization (3.9) (39.7) (43.6) Accrual at September 30, 2021 $ 0.5 $ 3.3 $ 3.8 Accrual at December 31, 2021 $ 0.7 $ 2.7 $ 3.4 Charges 3.4 15.8 19.2 Cash utilization (1.3) (13.9) (15.2) Accrual at September 30, 2022 $ 2.8 $ 4.6 $ 7.4 As part of our restructuring actions, we incurred total severance charges of approximately $3.4 million and $2.7 million during the nine months ended September 30, 2022 and 2021, respectively. We also incurred total implementation costs of approximately $15.8 million and $33.2 million during the nine months ended September 30, 2022 and 2021, respectively. Implementation costs consist primarily of professional fees and plant exit costs. We incurred $12.4 million of restructuring costs under the 2020 Program and incurred $6.8 million of costs associated with the anticipated closure of Emporium in the nine months ended September 30, 2022. We have incurred $99.7 million of total restructuring costs under the 2020 Program since inception and have incurred $10.5 million of total costs related to the anticipated closure of Emporium. Approximately $1.3 million and $12.0 million of our total restructuring costs for the nine months ended September 30, 2022 related to our Driveline and Metal Forming segments, respectively, while the remainder were corporate costs. Approximately $3.9 million and $3.1 million of our total restructuring costs for the nine months ended September 30, 2021 related to our Driveline and Metal Forming segments, respectively, while the remainder were corporate costs. We expect to incur approximately $20 million to $30 million of total restructuring charges in 2022 associated with the 2020 Program, our closure of Emporium and potential restructuring actions related to our acquisition of the Tekfor Group (Tekfor). On June 1, 2022, our acquisition of Tekfor became effective. The following table represents a summary of acquisition-related charges incurred primarily related to our acquisition of Tekfor, as well as integration costs incurred for acquisitions: Acquisition-Related Costs Integration Expenses Total (in millions) Charges for the nine months ended September 30, 2022 $ 5.8 $ 1.4 $ 7.2 Charges for the nine months ended September 30, 2021 0.3 4.6 4.9

Inventories (Notes)

Inventories (Notes)	9 Months Ended
	Sep. 30, 2022
Inventory Disclosure [Abstract]
Inventory Disclosure [Text Block]	3. INVENTORIES We state our inventories at the lower of cost or net realizable value. The cost of our inventories is determined using the first-in first-out 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: September 30, 2022 December 31, 2021 (in millions) Raw materials and work-in-progress $ 398.2 $ 339.7 Finished goods 76.7 89.3 Gross inventories 474.9 429.0 Inventory valuation reserves (28.1) (18.6) Inventories, net $ 446.8 $ 410.4

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Notes)	9 Months Ended
	Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets Disclosure [Text Block]	4. GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill The following table provides a reconciliation of changes in goodwill for the nine months ended September 30, 2022: Consolidated (in millions) Balance at December 31, 2021 $ 183.8 Foreign currency translation (4.5) Balance at September 30, 2022 $ 179.3 We conduct our annual goodwill impairment test in the fourth quarter of each year, as well as whenever adverse events or changes in circumstances indicate a possible impairment. In performing this test, we utilize a third-party valuation specialist to assist management in determining the fair value of our reporting units. Fair value of each reporting unit is estimated based on a combination of discounted cash flows and the use of pricing multiples derived from an analysis of comparable public companies multiplied against historical and/or anticipated financial metrics of each reporting unit. These calculations contain uncertainties as they require management to make assumptions including, but not limited to, market comparables, future cash flows of the reporting units, and appropriate discount and long-term growth rates. This fair value determination is categorized as Level 3 within the fair value hierarchy. At September 30, 2022, accumulated goodwill impairment losses were $1,435.5 million. All remaining goodwill is attributable to our Driveline reporting unit. Other Intangible Assets The following table provides a reconciliation of the gross carrying amount and associated accumulated amortization for AAM's other intangible assets, which are all subject to amortization: September 30, December 31, 2022 2021 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount (in millions) Capitalized computer software $ 51.3 $ (42.0) $ 9.3 $ 47.3 $ (37.0) $ 10.3 Customer platforms 856.2 (348.9) 507.3 856.2 (301.3) 554.9 Customer relationships 53.0 (18.8) 34.2 53.0 (16.2) 36.8 Technology and other 153.8 (68.4) 85.4 156.1 (60.9) 95.2 Total $ 1,114.3 $ (478.1) $ 636.2 $ 1,112.6 $ (415.4) $ 697.2 Amortization expense for our intangible assets was $21.5 million and $64.4 million for the three and nine months ended September 30, 2022, respectively, and $21.4 million and $64.3 million for the three and nine months ended September 30, 2021. Estimated amortization expense for the years 2022 through 2026 is expected to be in the range of approximately $80 million to $85 million per year.

Long-Term Debt (Notes)

Long-Term Debt (Notes)	9 Months Ended
	Sep. 30, 2022
Debt Disclosure [Abstract]
Long-term Debt [Text Block]	5. LONG-TERM DEBT Long-term debt consists of the following: September 30, 2022 December 31, 2021 (in millions) Revolving Credit Facility $ — $ — Term Loan A Facility 520.0 301.8 Term Loan B Facility 750.0 850.0 6.875% Notes due 2028 400.0 400.0 6.50% Notes due 2027 500.0 500.0 6.25% Notes due 2026 180.0 400.0 5.00% Notes due 2029 600.0 600.0 Foreign credit facilities and other 70.2 86.1 Total debt 3,020.2 3,137.9 Less: Current portion of long-term debt 19.2 18.8 Long-term debt 3,001.0 3,119.1 Less: Debt issuance costs 26.9 33.4 Long-term debt, net $ 2,974.1 $ 3,085.7 Senior Secured Credit Facilities In 2017, American Axle & Manufacturing Holdings, Inc. (Holdings) and American Axle & Manufacturing, Inc. (AAM, Inc.) entered into a credit agreement which was amended on July 29, 2019 and further amended on April 28, 2020, and June 11, 2021 (the Credit Agreement). In connection with the Credit Agreement, Holdings, AAM, Inc. and certain of their restricted subsidiaries entered into a Collateral Agreement and Guarantee Agreement with the financial institutions party thereto. The Credit Agreement originally included a $340 million term loan A facility (the Term Loan A Facility), a $1.55 billion term loan B facility (the Term Loan B Facility) and a $925 million multi-currency revolving credit facility (the Revolving Credit Facility, and together with the Term Loan A Facility and the Term Loan B Facility, the Senior Secured Credit Facilities). In March 2022, Holdings and AAM, Inc. entered into the Amended & Restated Credit Agreement. The Amended & Restated Credit Agreement, among other things, increased the principal amount of the Term Loan A Facility to $520.0 million, extended the maturity date of the Term Loan A Facility and the Revolving Credit Facility each to March 11, 2027, and established the use under the Term Loan A Facility and Revolving Credit Facility of the Secured Overnight Financing Rate (SOFR) and the minimum Adjusted Term SOFR Rate for Eurodollar-based loans denominated in U.S. Dollars and the Sterling Overnight Index Average (SONIA) and the minimum adjusted daily simple SONIA for loans denominated in Sterling. The Amended & Restated Credit Agreement also removed the senior secured net leverage ratio covenant, increased the maximum levels of the total net leverage ratio covenant for certain periods, modified the cash interest expense coverage ratio covenant, and modified certain covenants restricting the ability of Holdings, AAM and certain subsidiaries of Holdings to create, incur, assume or permit to exist certain additional indebtedness and liens, to make investments and to make or agree to pay or make certain restricted payments, voluntary payments and distributions. We expensed $0.2 million of debt refinancing costs, paid accrued interest of $1.0 million, and paid debt issuance costs of $4.4 million in the nine months ended September 30, 2022 related to the Amended & Restated Credit Agreement. The terms of the Term Loan B Facility, including the maturity date, interest rates and applicable margin with respect to such interest rates, under the Amended & Restated Credit Agreement remain unchanged. There are no significant current maturities under the Term Loan A Facility and there are no scheduled payments due under the Term Loan B Facility until maturity in 2024. In the first quarter of 2022, we made a voluntary prepayment of $25.0 million on our Term Loan B Facility. As a result, we expensed approximately $0.2 million for the write-off of a portion of the unamortized debt issuance costs that we had been amortizing over the expected life of this borrowing. In the second quarter of 2022, we made a voluntary prepayment of $25.0 million on our Term Loan B Facility. As a result, we expensed approximately $0.2 million for the write-off of a portion of the unamortized debt issuance costs that we had been amortizing over the expected life of this borrowing. In the third quarter of 2022, we made voluntary prepayments totaling $50.0 million on our Term Loan B Facility. As a result, we expensed approximately $0.2 million for the write-off of a portion of the unamortized debt issuance costs that we had been amortizing over the expected life of this borrowing. In the first quarter of 2021, we made a voluntary prepayment of $100.0 million on our Term Loan B Facility and $4.3 million on our Term Loan A Facility. As a result, we expensed approximately $1.1 million for the write-off of a portion of the unamortized debt issuance costs that we had been amortizing over the expected life of these borrowings. In the second quarter of 2021, we made voluntary prepayments totaling $138.8 million on our Term Loan B Facility and $4.2 million on our Term Loan A Facility. As a result, we expensed approximately $1.3 million for the write-off of a portion of the unamortized debt issuance costs that we had been amortizing over the expected life of these borrowings. In the third quarter of 2021, we made a voluntary prepayment of $12.7 million on our Term Loan A Facility. As a result, we expensed approximately $0.1 million for the write-off of a portion of the unamortized debt issuance costs that we had been amortizing over the expected life of this borrowing. At September 30, 2022, we had $893.5 million available under the Revolving Credit Facility. This availability reflects a reduction of $31.5 million for standby letters of credit issued against the facility. The proceeds of the Revolving Credit Facility are used for general corporate purposes. The Senior Secured Credit Facilities provide back-up liquidity for our foreign credit facilities. We intend to use the availability of long-term financing under the Senior Secured Credit Facilities 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. Redemption of 6.25% Notes due 2026 In the first quarter of 2022, we used the proceeds from the upsized Term Loan A Facility to voluntarily redeem a portion of our 6.25% Notes due 2026. This resulted in a principal payment of $220.0 million and $0.2 million in accrued interest. We also expensed approximately $1.8 million for the write-off of a portion of the unamortized debt issuance costs that we had been amortizing over the expected life of the borrowing, and approximately $3.4 million for the payment of an early redemption premium. 5.00% Notes due 2029 In the third quarter of 2021, we issued $600.0 million in aggregate principal amount of 5.00% senior notes due 2029 (the 5.00% Notes). Proceeds from the 5.00% Notes were used to fund the redemption of the remaining $600.0 million of our former 6.25% senior notes due 2025. We paid debt issuance costs of $9.2 million in the nine months ended September 30, 2021 related to the 5.00% Notes. Redemption of 6.25% Notes due 2025 In the third quarter of 2021, we voluntarily redeemed our 6.25% Notes due 2025. This resulted in principal payments totaling $700.0 million and $19.4 million in accrued interest. We also expensed approximately $9.6 million for the write-off of the unamortized debt issuance costs that we had been amortizing over the expected life of the borrowing, and approximately $21.9 million for the payment of an early redemption premium. Repayment of Tekfor Group Indebtedness Upon the acquisition of Tekfor, we assumed $23.4 million of existing Tekfor indebtedness, of which we repaid $10.7 million in the first nine months of 2022. Foreign credit facilities and Other We utilize local currency credit facilities to finance the operations of certain foreign subsidiaries. At September 30, 2022, $70.2 million was outstanding under our foreign credit facilities, as compared to $86.1 million at December 31, 2021. At September 30, 2022, an additional $64.7 million was available under our foreign credit facilities. Weighted-Average Interest Rate The weighted-average interest rate of our long-term debt outstanding was 5.8% at September 30, 2022 and 5.6% at December 31, 2021.

Derivatives (Notes)

Derivatives (Notes)	9 Months Ended
	Sep. 30, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Text Block]	6. DERIVATIVES Our business and financial results are affected by fluctuations in global 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 derivative contracts From time to time, we use foreign currency forward contracts to reduce the effects of fluctuations in exchange rates relating to certain foreign currencies. As of September 30, 2022 and December 31, 2021, we had currency forward contracts outstanding with a total notional amount of $172.8 million and $164.7 million, respectively, that hedge our exposure to changes in foreign currency exchange rates for certain payroll expenses into the second quarter of 2025 and the purchase of certain direct and indirect inventory and other working capital items into the second quarter of 2023. Fixed-to-fixed cross-currency swap In 2020, we entered into a fixed-to-fixed cross-currency swap to reduce the variability of functional currency equivalent cash flows associated with changes in exchange rates on certain Euro-based intercompany loans. In the second quarter of 2022, we discontinued this fixed-to-fixed cross-currency swap, which was in an asset position of $9.7 million on the date that it was discontinued. Also in the second quarter of 2022, we entered into a new fixed-to-fixed cross-currency swap to reduce the variability of functional currency equivalent cash flows associated with changes in exchange rates on certain Euro-based intercompany loans. We had notional amounts outstanding under fixed-to-fixed cross-currency swaps of €200.0 million at both September 30, 2022 and December 31, 2021, which were equivalent to $195.9 million and $226.9 million, respectively. The fixed-to-fixed cross-currency swap hedges our exposure to changes in exchange rates on the intercompany loans into the second quarter of 2024. Variable-to-fixed interest rate swap In 2019, we entered into a variable-to-fixed interest rate swap to reduce the variability of cash flows associated with interest payments on our variable rate debt. In the second quarter of 2022, we discontinued this variable-to-fixed interest rate swap, which was in an asset position of $6.1 million on the date that it was discontinued. Also in the second quarter of 2022, we entered into a new variable-to-fixed interest rate swap to reduce the variability of cash flows associated with interest payments on our variable rate debt. As of September 30, 2022, we have $500.0 million notional amount hedged in relation to our variable-to-fixed interest rate swap into the third quarter of 2027. The following table summarizes the reclassification of pre-tax derivative gains and losses into net income from accumulated other comprehensive income (loss) for those derivative instruments designated as cash flow hedges under Accounting Standards Codification (ASC) 815 - Derivatives and Hedging : Location Gain (Loss) Reclassified During Total of Financial Gain Expected of Gain (Loss) Three Months Ended Nine Months Ended Statement to be Reclassified Reclassified into September 30, September 30, Line Item During the Net Income 2022 2021 2022 2021 2022 Next 12 Months (in millions) Currency forward contracts Cost of Goods Sold $ 1.5 $ 1.1 $ 4.6 $ 5.2 $ 3,872.0 $ 5.6 Fixed-to-fixed cross-currency swap Other Income (Expense), net 13.8 6.0 31.7 14.0 (4.4) 0.3 Variable-to-fixed interest rate swap Interest Expense (0.1) (3.5) (3.5) (11.4) (132.2) 5.3 See Note 12 - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (AOCI) for amounts recognized in other comprehensive income (loss) during the three and nine months ended September 30, 2022 and 2021. The following table summarizes the amount and location of gains and losses recognized in the Condensed Consolidated Statements of Operations for those derivative instruments not designated as hedging instruments under ASC 815: Location Gain (Loss) Recognized During Total of Financial of Gain (Loss) Three Months Ended Nine Months Ended Statement Recognized in September 30, September 30, Line Item Net Income 2022 2021 2022 2021 2022 (in millions) Currency forward contracts Other Income (Expense), net $ 0.3 $ (0.5) $ 1.4 $ (0.1) $ (4.4)

Fair Value (Notes)

Fair Value (Notes)	9 Months Ended
	Sep. 30, 2022
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Text Block]	7. FAIR VALUE ASC 820 - Fair Value Measurement 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 carrying 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: Fair Value September 30, 2022 December 31, 2021 Input (in millions) Balance Sheet Classification Cash equivalents $ 292.0 $ 196.5 Level 1 Prepaid expenses and other Cash flow hedges - currency forward contracts 5.7 2.2 Level 2 Cash flow hedges - variable-to-fixed interest rate swap 2.5 1.9 Level 2 Nondesignated - currency forward contracts 0.2 0.2 Level 2 Other assets and deferred charges Cash flow hedges - currency forward contracts 1.6 1.4 Level 2 Cash flow hedges - fixed-to-fixed cross-currency swap 15.3 — Level 2 Cash flow hedges - variable-to-fixed interest rate swap 9.4 2.2 Level 2 Investment in equity securities 3.4 27.4 Level 1 Accrued expenses and other Cash flow hedges - currency forward contracts — 0.3 Level 2 Cash flow hedges - variable-to-fixed interest rate swap — 9.6 Level 2 Postretirement benefits and other long-term liabilities Cash flow hedges - currency forward contracts 0.1 0.6 Level 2 Cash flow hedges - fixed-to-fixed cross-currency swap — 3.7 Level 2 Cash flow hedges - variable-to-fixed interest rate swap — 12.7 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 have an investment in the equity securities of REE Automotive, an e-mobility company. These equity securities are measured at fair value each reporting period with changes in fair value reported through an unrealized gain or loss within Other income (expense), net in our Condensed Consolidated Statement of Operations. As of September 30, 2022, our investment in REE shares was valued at $3.4 million based on a closing price on that date of $0.68 per share. We estimated the fair value of the amounts outstanding on our debt using available market information and other observable data, to be as follows: September 30, 2022 December 31, 2021 Carrying Amount Fair Value Carrying Amount Fair Value Input (in millions) Revolving Credit Facility $ — $ — $ — $ — Level 2 Term Loan A Facility 520.0 507.7 301.8 301.8 Level 2 Term Loan B Facility 750.0 731.3 850.0 847.9 Level 2 6.875% Notes due 2028 400.0 342.0 400.0 430.0 Level 2 6.50% Notes due 2027 500.0 422.5 500.0 519.4 Level 2 6.25% Notes due 2026 180.0 165.2 400.0 408.5 Level 2 5.00% Notes due 2029 600.0 450.0 600.0 588.0 Level 2

Employee Benefit Plans (Notes)

Employee Benefit Plans (Notes)	9 Months Ended
	Sep. 30, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Pension and Other Postretirement Benefits Disclosure [Text Block]	8. EMPLOYEE BENEFIT PLANS The components of net periodic benefit cost (credit) are as follows: Pension Benefits Three Months Ended Nine Months Ended September 30, September 30, 2022 2021 2022 2021 (in millions) Service cost $ 0.5 $ 0.5 $ 1.4 $ 1.5 Interest cost 4.1 4.4 12.5 13.0 Expected asset return (8.0) (9.7) (23.8) (29.1) Amortized loss 2.0 2.7 5.8 8.1 Net periodic benefit credit $ (1.4) $ (2.1) $ (4.1) $ (6.5) Other Postretirement Benefits Three Months Ended Nine Months Ended September 30, September 30, 2022 2021 2022 2021 (in millions) Service cost $ 0.1 $ — $ 0.2 $ 0.2 Interest cost 2.1 2.1 6.3 6.3 Amortized loss 0.2 0.4 0.4 1.2 Amortized prior service credit (0.3) (0.3) (0.7) (1.1) Net periodic benefit cost $ 2.1 $ 2.2 $ 6.2 $ 6.6 The noncurrent liabilities associated with our pension and other postretirement benefit plans are classified as Postretirement benefits and other long-term liabilities on our Condensed Consolidated Balance Sheets. As of September 30, 2022 and December 31, 2021, we have a noncurrent pension liability of $113.9 million and $121.3 million, respectively. As of September 30, 2022 and December 31, 2021, we have a noncurrent other postretirement benefits liability of $476.2 million and $481.2 million, respectively. Due to the availability of our pre-funded pension balances (previous contributions in excess of prior required pension contributions), we expect our regulatory pension funding requirements in 2022 to be less than $1 million. We expect our cash payments for other postretirement benefit obligations in 2022, net of GM cost sharing, to be approximately $16.5 million.

Product Warranties (Notes)

Product Warranties (Notes)	9 Months Ended
	Sep. 30, 2022
Product Warranties Disclosures [Abstract]
Product Warranty Disclosure [Text Block]	9. 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 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 Nine Months Ended September 30, September 30, 2022 2021 2022 2021 (in millions) Beginning balance $ 61.9 $ 64.3 $ 59.5 $ 66.7 Accruals 3.4 5.7 11.3 14.1 Payments (4.5) (11.7) (8.6) (14.3) Adjustment to prior period accruals (7.3) (0.4) (7.9) (8.4) Foreign currency translation (0.8) (0.3) (1.6) (0.5) Ending balance $ 52.7 $ 57.6 $ 52.7 $ 57.6

Income Taxes (Notes)

Income Taxes (Notes)	9 Months Ended
	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	10. INCOME TAXES We adjust our effective tax rate each quarter based on our estimated annual effective tax rate. We also record the tax impact of certain discrete, unusual or infrequently occurring items, including changes in judgment about valuation allowances and the effects of changes in tax laws or rates on deferred tax balances, 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. Our income tax benefit and effective income tax rate for the three and nine months ended September 30, 2022 and 2021 are as follows: Three Months Ended Nine Months Ended September 30, September 30, 2022 2021 2022 2021 (in millions) Income tax benefit $ (5.7) $ (13.6) $ (2.1) $ (2.4) Effective income tax rate (27.4) % 85.0 % (4.3) % (4.8) % For the three and nine months ended September 30, 2022, we recognized a net income tax benefit of approximately $7.5 million related to the release of a valuation allowance in a foreign jurisdiction. During the three and nine months ended September 30, 2021, we recognized a net income tax benefit of approximately $5.2 million related to our ability to carry back prior year losses to tax years with the higher 35% corporate income tax rate under provisions of the CARES Act. Our effective income tax rate for the three months ended September 30, 2022 varies from our effective income tax rate for the three months ended September 30, 2021 primarily as a result of the release of the foreign valuation allowance during the three months ended September 30, 2022 as noted above, as well as the mix of earnings on a jurisdictional basis during these periods. Our effective income tax rate for the nine months ended September 30, 2022 varies from our effective income tax rate for the nine months ended September 30, 2021 primarily as a result of the $13.0 million gain on bargain purchase of business recognized in the nine months ended September 30, 2022, which was not subject to income tax, as well as the release of the foreign valuation allowance during the nine months ended September 30, 2022 and the mix of earnings on a jurisdictional basis during these periods. For the three and nine months ended September 30, 2022 and 2021, our effective income tax rates vary from the U.S. federal statutory rate primarily due to the discrete items noted above, the benefit from foreign derived intangible income deductions, the change in jurisdictional mix of earnings, and favorable foreign tax rates and the impact of tax credits. In addition, for the nine months ended September 30, 2022, our effective income tax rate varies from the U.S. federal statutory rate as a result of the gain on bargain purchase of business recognized during this period. In accordance with the guidance in ASC 740 - Income Taxes , we review the likelihood that we will realize the benefit of deferred tax assets and estimate whether recoverability of our deferred tax assets is "more likely than not" based on the available evidence. During the three months ended September 30, 2022, we released a valuation allowance against the net deferred tax assets in a foreign jurisdiction resulting in a net tax benefit of approximately $7.5 million. Due to the uncertainty associated with the extent and ultimate impact of the significant supply chain constraints affecting the automotive industry, including COVID-19, the semiconductor shortage and resulting impact on global automotive production volumes, and the conflict between Russia and Ukraine, we may experience lower than projected earnings in certain jurisdictions in future periods, and as a result, it is reasonably possible that changes in valuation allowances could be recognized in future periods and such changes could be material to our financial statements. Other Income Tax Matters We operate in multiple jurisdictions throughout the world and the income tax returns of several subsidiaries in various tax jurisdictions are currently under examination. During their examination of our 2015 U.S. federal income tax return, the Internal Revenue Service (IRS) asserted that income earned by a Luxembourg subsidiary from its Mexican branch operations should be categorized as foreign base company sales income (FBCSI) under Section 954(d) of the Internal Revenue Code and recognized currently as taxable income on our 2015 U.S. federal income tax return. As a result of this assertion, the IRS issued a Notice of Proposed Adjustment (NOPA). AAM disagreed with the NOPA, believes that the proposed adjustment is without merit and contested the matter through the IRS’s administrative appeals process. No resolution was reached in the appeals process and on September 15, 2022, the IRS issued a Notice of Deficiency with an asserted tax liability of approximately $7 million related to the 2015 tax year, as calculated by the IRS, after utilizing available net operating losses and income tax credits. We believe it is likely that we will be successful in ultimately defending our position. As such, we have not recorded any impact of the IRS’s proposed adjustment in our condensed consolidated financial statements. In the event AAM is not successful in defending its position, the potential additional income tax expense, including estimated interest charges, related to tax years 2015 through 2021, is estimated to be in the range of approximately $275 million to $325 million. We expect to pay the asserted tax liability of approximately $7 million related to 2015, plus related interest, during the first half of 2023. In a matter of related interest, in May 2020, the U.S Tax Court ruled against another U.S. corporation, finding that the income it earned through a Mexican branch of its Luxembourg subsidiary corporation was FBCSI. In that situation, the taxpayer appealed the U.S. Tax Court decision to the U.S. Court of Appeals for the Sixth Circuit. In December 2021, the U.S. Court of Appeals affirmed, in a split decision, the Tax Court decision in favor of the IRS. In January 2022, the taxpayer in the above referenced matter filed a petition for rehearing and this petition was denied by the U.S. Court of Appeals for the Sixth Circuit in March 2022. In June 2022, the taxpayer filed a petition with the United States Supreme Court to review the judgment of the U.S. Court of Appeals for the Sixth Circuit and this petition is pending. Notwithstanding the decisions rendered thus far in that case, and because our position is based upon different facts and circumstances, including but not limited to, differences in structure, and different income tax regulations in effect for our tax years under examination, we continue to believe, after consultation with tax and legal counsel that it is more likely than not that our structure does not give rise to FBCSI. We intend to continue to vigorously contest the conclusions reached in the Notice of Deficiency with the IRS and, if necessary, through litigation.

Earnings Per Share (Notes)

Earnings Per Share (Notes)	9 Months Ended
	Sep. 30, 2022
Earnings Per Share [Abstract]
Earnings Per Share [Text Block]	11. EARNINGS (LOSS) PER SHARE (EPS) We present 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 non-forfeitable dividend rights. Our participating securities are our 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 Nine Months Ended September 30, September 30, 2022 2021 2022 2021 (in millions, except per share data) Numerator Net income (loss) $ 26.5 $ (2.4) $ 50.4 $ 52.2 Less: Net income attributable to participating securities (1.1) — (2.0) (2.0) Net income (loss) attributable to common shareholders - Basic and Dilutive $ 25.4 $ (2.4) $ 48.4 $ 50.2 Denominators Basic common shares outstanding - Weighted-average shares outstanding 119.6 118.5 119.3 118.5 Less: Participating securities (5.0) (4.4) (4.9) (4.6) Weighted-average common shares outstanding 114.6 114.1 114.4 113.9 Effect of dilutive securities - Dilutive stock-based compensation 1.5 — 0.9 0.2 Diluted shares outstanding - Adjusted weighted-average shares after assumed conversions 116.1 114.1 115.3 114.1 Basic EPS $ 0.22 $ (0.02) $ 0.42 $ 0.44 Diluted EPS $ 0.22 $ (0.02) $ 0.42 $ 0.44

Reclassifications out of Accumu

Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Notes)	9 Months Ended
	Sep. 30, 2022
Reclassifications out of Accumulated Other Comprehensive Income (Loss) [Abstract]
Disclosure of Reclassification Amount [Text Block]	12. RECLASSIFICATIONS OUT OF ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (AOCI) Reclassification adjustments and other activity impacting accumulated other comprehensive income (loss) during the three and nine months ended September 30, 2022 and September 30, 2021 are as follows (in millions) : Defined Benefit Plans Foreign Currency Translation Adjustments Unrecognized Gain (Loss) on Cash Flow Hedges Total Balance at June 30, 2022 $ (239.3) $ (147.6) $ 2.4 $ (384.5) Other comprehensive income (loss) before reclassifications — (34.4) 39.2 4.8 Income tax effect of other comprehensive income (loss) before reclassifications — — (7.8) (7.8) Amounts reclassified from accumulated other comprehensive income (loss) 1.9 (a) — (15.2) (b) (13.3) Income taxes reclassified into net income (0.4) — 2.9 2.5 Net change in accumulated other comprehensive income (loss) 1.5 (34.4) 19.1 (13.8) Balance at September 30, 2022 $ (237.8) $ (182.0) $ 21.5 $ (398.3) Defined Benefit Plans Foreign Currency Translation Adjustments Unrecognized Gain (Loss) on Cash Flow Hedges Total Balance at June 30, 2021 $ (306.7) $ (99.9) $ (15.3) $ (421.9) Other comprehensive income (loss) before reclassifications — (9.6) 2.5 (7.1) Income tax effect of other comprehensive income (loss) before reclassifications — — (1.2) (1.2) Amounts reclassified from accumulated other comprehensive loss 2.8 (a) — (3.6) (b) (0.8) Income taxes reclassified into net income (0.6) — 0.5 (0.1) Net change in accumulated other comprehensive loss 2.2 (9.6) (1.8) (9.2) Balance at September 30, 2021 $ (304.5) $ (109.5) $ (17.1) $ (431.1) (a) These amounts were reclassified from AOCI to Other income (expense), net for the three months ended September 30, 2022 and September 30, 2021. (b) The amounts reclassified from AOCI included $(1.5) million in cost of goods sold (COGS), $0.1 million in interest expense and $(13.8) million in Other income (expense), net for the three months ended September 30, 2022 and $(1.1) million in COGS, $3.5 million in interest expense and $(6.0) million in Other income (expense), net for the three months ended September 30, 2021. Defined Benefit Plans Foreign Currency Translation Adjustments Unrecognized Gain (Loss) on Cash Flow Hedges Total Balance at December 31, 2021 $ (241.9) $ (111.3) $ (11.6) $ (364.8) Other comprehensive income (loss) before reclassifications — (70.7) 73.5 2.8 Income tax effect of other comprehensive income (loss) before reclassifications — — (13.5) (13.5) Amounts reclassified from accumulated other comprehensive loss 5.5 (a) — (32.8) (b) (27.3) Income taxes reclassified into net income (1.4) — 5.9 4.5 Net change in accumulated other comprehensive income (loss) 4.1 (70.7) 33.1 (33.5) Balance at September 30, 2022 $ (237.8) $ (182.0) $ 21.5 $ (398.3) Defined Benefit Plans Foreign Currency Translation Adjustments Unrecognized Gain (Loss) on Cash Flow Hedges Total Balance at December 31, 2020 $ (311.0) $ (101.1) $ (20.1) $ (432.2) Other comprehensive income (loss) before reclassifications — (8.9) 13.5 4.6 Income tax effect of other comprehensive income (loss) before reclassifications — — (3.3) (3.3) Amounts reclassified from accumulated other comprehensive loss 8.2 (a) 0.5 (7.8) (b) 0.9 Income taxes reclassified into net income (1.7) — 0.6 (1.1) Net change in accumulated other comprehensive loss 6.5 (8.4) 3.0 1.1 Balance at September 30, 2021 $ (304.5) $ (109.5) $ (17.1) $ (431.1) (a) These amounts were reclassified from AOCI to Other income (expense), net for the nine months ended September 30, 2022 and September 30, 2021. (b) The amounts reclassified from AOCI included $(4.6) million in cost of goods sold (COGS), $3.5 million in interest expense and $(31.7) million in Other income (expense), net for the nine months ended September 30, 2022 and $(5.2) million in COGS, $11.4 million in interest expense and $(14.0) million in Other income (expense), net for the nine months ended September 30, 2021.

Revenue from Contracts with Cus

Revenue from Contracts with Customers (Notes)	9 Months Ended
	Sep. 30, 2022
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Text Block]	13. REVENUE FROM CONTRACTS WITH CUSTOMERS Net sales recognized from contracts with customers, disaggregated by segment and geographical location, are presented in the following table for the three and nine months ended September 30, 2022 and 2021. Net sales are attributed to regions based on the location of production. Intersegment sales have been excluded from the table. Three Months Ended September 30, 2022 (in millions) Driveline Metal Forming Total North America $ 817.5 $ 332.0 $ 1,149.5 Asia 124.4 13.0 137.4 Europe 92.2 106.6 198.8 South America 25.7 23.8 49.5 Total $ 1,059.8 $ 475.4 $ 1,535.2 Three Months Ended September 30, 2021 Driveline Metal Forming Total North America $ 647.4 $ 279.9 $ 927.3 Asia 107.8 11.8 119.6 Europe 84.9 49.6 134.5 South America 29.5 2.2 31.7 Total $ 869.6 $ 343.5 $ 1,213.1 Nine Months Ended September 30, 2022 Driveline Metal Forming Total North America $ 2,465.1 $ 939.6 $ 3,404.7 Asia 334.5 31.9 366.4 Europe 298.6 243.7 542.3 South America 61.8 34.5 96.3 Total $ 3,160.0 $ 1,249.7 $ 4,409.7 Nine Months Ended September 30, 2021 Driveline Metal Forming Total North America $ 2,143.2 $ 876.6 $ 3,019.8 Asia 329.9 36.0 365.9 Europe 288.7 171.7 460.4 South America 67.7 7.7 75.4 Total $ 2,829.5 $ 1,092.0 $ 3,921.5 Contract Assets and Liabilities The following table summarizes our beginning and ending balances for accounts receivable and contract liabilities associated with our contracts with customers (in millions) : Accounts Receivable, Net Contract Liabilities (Current) Contract Liabilities (Long-term) December 31, 2021 $ 762.8 $ 28.1 $ 94.8 September 30, 2022 974.6 29.2 70.1 Increase/(decrease) $ 211.8 $ 1.1 $ (24.7) Contract liabilities relate to deferred revenue associated with various settlements and commercial agreements for which we have a future performance obligation to the customer. We recognize this deferred revenue into revenue over the life of the associated program as we satisfy our performance obligations to the customer. We do not have contract assets as defined in ASC 606. We amortized previously recorded contract liabilities into revenue as we satisfied performance obligations with our customers of approximately $23.3 million and $17.3 million for the nine months ended September 30, 2022 and 2021, respectively.

Acquisitions and Dispositions (

Acquisitions and Dispositions (Notes)	9 Months Ended
	Sep. 30, 2022
Acquisitions and Dispositions [Abstract]
Acquisitions and Dispositions [Text Block]	14. ACQUISITIONS AND DISPOSITIONS Acquisition of Tekfor Group On June 1, 2022, our acquisition of Tekfor Group became effective and we paid a total purchase price of $94.4 million, which was funded entirely with cash on hand. Tekfor Group manufactures high-performance components, modules and fasteners, including traditional powertrain and driveline components (for both internal combustion and hybrid applications), and e-mobility components. Our acquisition of Tekfor contributes to diversifying our geographic and customer sales mix, while also increasing our electrification product portfolio. The acquisition of Tekfor Group was accounted for under the acquisition method under ASC 805 - Business Combinations with the purchase price allocated to the identifiable assets and liabilities of the acquired company based on the respective fair values of the assets and liabilities. The following represents the preliminary fair values of the assets acquired and liabilities assumed resulting from the acquisition, including measurement period adjustments recorded in the third quarter of 2022 (in millions) : Initial Allocation Adjustments September 30, 2022 Total consideration transferred $ 94.4 $ — $ 94.4 Cash and cash equivalents $ 14.3 $ — $ 14.3 Accounts receivable 33.1 0.6 33.7 Inventories 44.9 1.4 46.3 Prepaid expenses and other long-term assets 30.8 (0.5) 30.3 Deferred income tax assets 3.5 — 3.5 Property, plant and equipment 105.7 (0.1) 105.6 Total assets acquired $ 232.3 $ 1.4 $ 233.7 Accounts payable 33.3 0.2 33.5 Accrued expenses and other 26.3 0.6 26.9 Deferred income tax liabilities 1.0 — 1.0 Debt 23.4 — 23.4 Postretirement benefits and other long-term liabilities 42.3 (0.8) 41.5 Net assets acquired $ 106.0 $ 1.4 $ 107.4 Gain on bargain purchase of business $ 11.6 $ 1.4 $ 13.0 The gain on bargain purchase of business was primarily the result of current macroeconomic factors such as the supply chain disruptions impacting the automotive industry, including the conflict between Russia and Ukraine, the semiconductor supply shortage, and increasing input costs, including materials, freight and utilities. The preliminary allocation of the purchase price to the assets acquired and liabilities assumed is based upon estimated information and is subject to change within the measurement period. Under the guidance in ASC 805, the measurement period is a period not to exceed one year from the acquisition date during which we may adjust estimated or provisional amounts recorded during purchase accounting if new information is obtained about facts and circumstances that existed as of the acquisition date that, if known, would have resulted in revised estimated values of those assets or liabilities as of that date. The primary areas of the preliminary purchase price allocation that are not yet finalized relate to property, plant and equipment, right-of-use assets and lease liabilities and deferred income tax assets and liabilities. The fair values of the assets acquired and liabilities assumed are based on our preliminary estimates and assumptions, as well as other information compiled by management, including valuations that utilize customary valuation procedures and techniques. While we believe that these preliminary estimates provide a reasonable basis for estimating the fair value of the assets acquired and liabilities assumed, we will continue to evaluate available information prior to finalization of the amounts. Included in net sales and net income for the period from the acquisition effective date on June 1, 2022 through September 30, 2022 was approximately $121 million and $10 million, respectively, attributable to Tekfor Group. The net income amount includes the gain on bargain purchase of business of $13.0 million that was recognized as a result of the acquisition, as well as a one-time expense of $5.0 million for the step-up of inventory to fair value. Unaudited Pro Forma Financial Information Unaudited pro forma net sales for AAM, on a combined basis with Tekfor Group for the nine months ended September 30, 2022 and September 30, 2021, were $4.55 billion and $4.20 billion, respectively, excluding Tekfor Group sales to AAM during those periods. Unaudited pro forma net income amounts for the nine months ended September 30, 2022 and September 30, 2021 were approximately $40 million and $75 million, respectively. Unaudited pro forma earnings per share amounts for the nine months ended September 30, 2022 and September 30, 2021 were $0.33 per share and $0.63 per share, respectively. Unaudited pro forma net income for the nine months ended September 30, 2021 includes a one-time gain of approximately $15 million associated with a Tekfor Group entity as a result of a favorable tax ruling in a foreign jurisdiction. The unaudited pro forma net income amounts for the nine months ended September 30, 2022 and September 30, 2021 have been adjusted for approximately $4 million, net of tax, related to the step-up of inventory to fair value as a result of the acquisition, approximately $5 million, net of tax, for acquisition-related costs, and approximately $13 million for the gain on bargain purchase of business recognized, which was not subject to tax. This resulted in a net reclassification of approximately $4 million from unaudited pro forma net income for the first nine months of 2022 into unaudited pro forma net income for the first nine months of 2021, as we are required to disclose the unaudited pro forma amounts as if the acquisition of Tekfor Group had been completed on January 1, 2021. The disclosure of unaudited pro forma net sales and earnings is for informational purposes only and does not purport to indicate the results that would actually have been obtained had the merger been completed on the assumed date for the periods presented, or which may be realized in the future. Acquisition of Manufacturing Facility in Emporium, Pennsylvania In May 2021, AAM completed our acquisition of a manufacturing facility in Emporium, Pennsylvania, under which we acquired $14.9 million of net assets that consisted of $5.9 million of inventory and $9.0 million of property, plant and equipment. The purchase price was $14.9 million, which consisted of $4.9 million of cash and $10.0 million of a deferred consideration liability that will be paid to seller at $2.5 million annually over the period 2022 through 2025. As the value of the net assets acquired was equal to the purchase price, no goodwill or gain on bargain purchase was recognized for this acquisition for the period ended September 30, 2021. The operating results of this manufacturing facility were insignificant to AAM's Condensed Consolidated Statements of Operations for the nine months ended September 30, 2022 and September 30, 2021. Further, we have not disclosed pro forma revenue and earnings for the nine months ended September 30, 2021 as the operating results of this manufacturing facility would be insignificant to AAM's consolidated results for the period. Sale of Interest in Consolidated Joint Venture In the nine months ended September 30, 2021, we completed the sale of our ownership interest in a consolidated joint venture and received cash proceeds of approximately $2.6 million. As a result of the sale and deconsolidation of this joint venture, we recognized a loss of $2.7 million in the first nine months of 2021. Subsequent to the sale of this joint venture, we no longer present noncontrolling interest in our condensed consolidated financial statements as all consolidated entities are wholly owned.

Manufacturing Facility Fire and

Manufacturing Facility Fire and Insurance Recovery (Notes)	9 Months Ended
	Sep. 30, 2022
Insurance Recoveries [Abstract]
Manufacturing Facility Fire and Insurance Recovery	15 . MANUFACTURING FACILITY FIRE AND INSURANCE RECOVERY On September 22, 2020, a significant industrial fire occurred at our Malvern Manufacturing Facility in Ohio (Malvern Fire). All associates were evacuated safely and without injury and we were able to maintain continuity of supply to our customers without any significant disruptions. Our insurance policies are expected to cover the repair, replacement or actual cash value of the assets that incurred loss or damage, less our applicable deductible of $1.0 million. In addition, our insurance policies are expected to provide coverage for interruption to our business, including lost or reduced profits and reimbursement for certain expenses and costs that are incurred relating to the fire. In the nine months ended September 30, 2022, we recorded $2.2 million of charges primarily related to transportation and freight and other costs incurred to resume or relocate operations and ensure continuity of supply to our customers. We also recorded an estimated insurance recovery of $8.6 million and received reimbursements and advances under our insurance policies of approximately $14.0 million, of which approximately $7.7 million is presented as an operating cash flow and $6.3 million is presented as an investing cash flow in our Condensed Consolidated Statement of Cash Flows. This resulted in net pre-tax income in our Condensed Consolidated Statement of Operations of approximately $6.4 million in Cost of goods sold for the nine months ended September 30, 2022. At September 30, 2022, $5.9 million of insurance recovery receivable is included in Prepaid expenses and other in our Condensed Consolidated Balance Sheet. Since the date of the Malvern Fire and the establishment of the insurance claim, we have incurred $54.6 million of total charges primarily related to site services and clean-up, transportation and freight, asset repairs and other costs incurred to resume or relocate operations and ensure continuity of supply to our customers. In addition, we have recorded a total of $27.0 million of costs primarily associated with the write-down of property, plant and equipment as a result of damage from the fire. We have recorded total estimated insurance recoveries of $90.1 million and have received total reimbursements and advances under our insurance policies of $84.2 million, of which $11.1 million was received in 2020, $59.1 million was received in 2021 and $14.0 million was received in the first nine months of 2022. In the fourth quarter of 2020, we determined that we will cease production at the Malvern Manufacturing Facility and relocate production capacity to other AAM manufacturing facilities. As such, we cannot estimate the total claim eligible costs that we will incur as a result of the Malvern Fire and the associated relocation of production capacity to other AAM manufacturing facilities. At September 30, 2022, we have estimated the amount of expected insurance proceeds recoverable in consideration of the policy provisions, estimated repair costs or actual cash value of damaged assets, and claim eligible expenses incurred from the date of the fire. We expect the claim settlement process to continue through 2022 based on the provisions of the policy. We will update our estimates as additional information becomes available, however, the actual impact on our results of operations, financial position or cash flows, or the timing of such impact, could differ from our estimates.

Segment Reporting (Notes)

Segment Reporting (Notes)	9 Months Ended
	Sep. 30, 2022
Segment Reporting [Abstract]
Segment Reporting Disclosure [Text Block]	16. SEGMENT REPORTING Our business is organized into Driveline and Metal Forming segments, with each representing a reportable segment under ASC 280 - Segment Reporting. The results of each segment are regularly reviewed by the chief operating decision maker to assess the performance of the segment and make decisions regarding the allocation of resources to the segments. Our product offerings by segment are as follows: • Driveline products consist primarily of front and rear axles, driveshafts, differential assemblies, clutch modules, balance shaft systems, disconnecting driveline technology, and electric and hybrid driveline products and systems for light trucks, sport utility vehicles (SUVs), crossover vehicles, passenger cars and commercial vehicles; and • Metal Forming products consist primarily of engine, transmission, driveline and safety-critical components for traditional internal combustion engine and electric vehicle architectures including light vehicles, commercial vehicles and off-highway vehicles, as well as products for industrial markets. We use Segment Adjusted EBITDA as the measure of earnings to assess the performance of each segment and determine the resources to be allocated to the segments. We define EBITDA to be earnings before interest expense, income taxes, depreciation and amortization. Segment Adjusted EBITDA is defined as EBITDA for our reportable segments excluding the impact of restructuring and acquisition-related costs, debt refinancing and redemption costs, loss on the sale of a business, impairment charges, pension settlements, unrealized gains or losses on equity securities, and non-recurring items. On June 1, 2022, our acquisition of Tekfor became effective and we began consolidating the results of Tekfor on that date, which are reported in our Metal Forming segment for the three and nine months ended September 30, 2022. The following tables represent information by reportable segment for the three and nine months ended September 30, 2022 and 2021 (in millions) : Three Months Ended September 30, 2022 Driveline Metal Forming Total Sales $ 1,061.1 $ 591.2 $ 1,652.3 Less: Intersegment sales 1.3 115.8 117.1 Net external sales $ 1,059.8 $ 475.4 $ 1,535.2 Segment Adjusted EBITDA $ 146.4 $ 52.0 $ 198.4 Three Months Ended September 30, 2021 Driveline Metal Forming Total Sales $ 870.4 $ 422.7 $ 1,293.1 Less: Intersegment sales 0.8 79.2 80.0 Net external sales $ 869.6 $ 343.5 $ 1,213.1 Segment Adjusted EBITDA $ 128.4 $ 54.8 $ 183.2 Nine Months Ended September 30, 2022 Driveline Metal Forming Total Sales $ 3,163.6 $ 1,585.9 $ 4,749.5 Less: intersegment sales 3.6 336.2 339.8 Net external sales $ 3,160.0 $ 1,249.7 $ 4,409.7 Segment Adjusted EBITDA $ 420.3 $ 169.3 $ 589.6 Nine Months Ended September 30, 2021 Driveline Metal Forming Total Sales $ 2,831.9 $ 1,352.1 $ 4,184.0 Less: intersegment sales 2.4 260.1 262.5 Net external sales $ 2,829.5 $ 1,092.0 $ 3,921.5 Segment Adjusted EBITDA $ 450.2 $ 218.5 $ 668.7 Total assets by reportable segment as of September 30, 2022 and December 31, 2021 were as follows (in millions) : September 30, 2022 Driveline Metal Forming Other Total Total Assets $ 2,898.8 $ 1,748.9 $ 1,031.9 $ 5,679.6 December 31, 2021 Driveline Metal Forming Other Total Total Assets $ 2,925.6 $ 1,576.9 $ 1,133.2 $ 5,635.7 Assets included in the Other column in the table above represent AAM Corporate assets, as well as eliminations of intercompany assets. The following table represents a reconciliation of Total Segment Adjusted EBITDA to consolidated income (loss) before income taxes for the three and nine months ended September 30, 2022 and 2021: Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 (in millions) Total segment adjusted EBITDA $ 198.4 $ 183.2 $ 589.6 $ 668.7 Interest expense (44.8) (49.7) (132.2) (150.7) Depreciation and amortization (124.8) (135.6) (367.1) (421.2) Restructuring and acquisition-related costs (7.9) (7.4) (26.4) (40.8) Loss on sale of business — — — (2.7) Unrealized gain (loss) on equity securities (2.3) 19.4 (24.0) 19.4 Debt refinancing and redemption costs (0.2) (31.6) (6.0) (34.0) Non-recurring items: Malvern Fire charges, net of recoveries 1.0 5.7 6.4 11.1 Acquisition-related fair value inventory adjustment — — (5.0) — Gain on bargain purchase of business 1.4 — 13.0 — Income (loss) before income taxes $ 20.8 $ (16.0) $ 48.3 $ 49.8

Organization and Basis of Pre_2

Organization and Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Accounting, Policy [Policy Text Block]	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, 2021 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. These estimates and assumptions are impacted by risks and uncertainties, including those associated with COVID-19, the semiconductor supply shortage that is impacting the automotive industry, inflationary pressures, fluctuations in interest and foreign exchange rates, and the conflict between Russia and Ukraine. While we have made estimates and assumptions based on the facts and circumstances available as of the date of this report, the full impact of these matters cannot be predicted, and actual results could differ materially from those estimates and assumptions. 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, 2021.
New Accounting Pronouncements and Other Regulatory Pronouncements, Policy [Policy Text Block]	Effect of New Accounting Standards and Other Regulatory Pronouncements Accounting Standard Update 2021-10 On November 17, 2021, the FASB issued ASU 2021-10 - Government Assistance (Topic 832). This guidance established requirements for annual disclosures about certain types of material government assistance, including government grants and tax credits. This guidance became effective and we prospectively adopted this guidance on January 1, 2022. The adoption of this standard did not have a material impact on our condensed consolidated financial statements. Coronavirus Aid, Relief, and Economic Security Act The Coronavirus Aid, Relief, and Economic Security Act (the CARES Act) was enacted on March 27, 2020 in the United States. The key provisions of the CARES Act, as they remain applicable to AAM, include the following: • The ability to use net operating losses (NOLs) to offset income without the 80% taxable income limitation enacted as part of the Tax Cuts and Jobs Act (TCJA) of 2017, and to carry back NOLs to offset prior year income for five years. These are temporary provisions that apply to NOLs incurred in 2018, 2019 or 2020 tax years. We received income tax refunds of $5.4 million and $6.0 million in the first quarter of 2022 and 2021, respectively, as a result of this provision of the CARES Act. • The ability to defer the payment of the employer portion of social security taxes incurred between March 27, 2020 and December 31, 2020, with 50% of the deferred amount paid by December 31, 2021 and the remaining 50% to be paid by December 31, 2022. At September 30, 2022, we had deferred $7.6 million of social security taxes, which are expected to be paid in the fourth quarter of 2022.

Restructuring and Acquisition_2

Restructuring and Acquisition-Related Costs (Tables)	9 Months Ended
	Sep. 30, 2022
Restructuring and Related Activities [Abstract]
Restructuring and Related Costs [Table Text Block]	A summary of our restructuring activity for the first nine months of 2022 and 2021 is shown below: Severance Charges Implementation Costs Total (in millions) Accrual at December 31, 2020 $ 1.7 $ 9.8 $ 11.5 Charges 2.7 33.2 35.9 Cash utilization (3.9) (39.7) (43.6) Accrual at September 30, 2021 $ 0.5 $ 3.3 $ 3.8 Accrual at December 31, 2021 $ 0.7 $ 2.7 $ 3.4 Charges 3.4 15.8 19.2 Cash utilization (1.3) (13.9) (15.2) Accrual at September 30, 2022 $ 2.8 $ 4.6 $ 7.4
Business Combination, Separately Recognized Transactions [Table Text Block]	On June 1, 2022, our acquisition of Tekfor became effective. The following table represents a summary of acquisition-related charges incurred primarily related to our acquisition of Tekfor, as well as integration costs incurred for acquisitions: Acquisition-Related Costs Integration Expenses Total (in millions) Charges for the nine months ended September 30, 2022 $ 5.8 $ 1.4 $ 7.2 Charges for the nine months ended September 30, 2021 0.3 4.6 4.9

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2022
Inventory Disclosure [Abstract]
Schedule of Inventory, Current [Table Text Block]	Inventories consist of the following: September 30, 2022 December 31, 2021 (in millions) Raw materials and work-in-progress $ 398.2 $ 339.7 Finished goods 76.7 89.3 Gross inventories 474.9 429.0 Inventory valuation reserves (28.1) (18.6) Inventories, net $ 446.8 $ 410.4

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill [Table Text Block]	The following table provides a reconciliation of changes in goodwill for the nine months ended September 30, 2022: Consolidated (in millions) Balance at December 31, 2021 $ 183.8 Foreign currency translation (4.5) Balance at September 30, 2022 $ 179.3
Schedule of Finite-Lived Intangible Assets [Table Text Block]	The following table provides a reconciliation of the gross carrying amount and associated accumulated amortization for AAM's other intangible assets, which are all subject to amortization: September 30, December 31, 2022 2021 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount (in millions) Capitalized computer software $ 51.3 $ (42.0) $ 9.3 $ 47.3 $ (37.0) $ 10.3 Customer platforms 856.2 (348.9) 507.3 856.2 (301.3) 554.9 Customer relationships 53.0 (18.8) 34.2 53.0 (16.2) 36.8 Technology and other 153.8 (68.4) 85.4 156.1 (60.9) 95.2 Total $ 1,114.3 $ (478.1) $ 636.2 $ 1,112.6 $ (415.4) $ 697.2

Long-Term Debt (Tables)

Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2022
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments [Table Text Block]	Long-term debt consists of the following: September 30, 2022 December 31, 2021 (in millions) Revolving Credit Facility $ — $ — Term Loan A Facility 520.0 301.8 Term Loan B Facility 750.0 850.0 6.875% Notes due 2028 400.0 400.0 6.50% Notes due 2027 500.0 500.0 6.25% Notes due 2026 180.0 400.0 5.00% Notes due 2029 600.0 600.0 Foreign credit facilities and other 70.2 86.1 Total debt 3,020.2 3,137.9 Less: Current portion of long-term debt 19.2 18.8 Long-term debt 3,001.0 3,119.1 Less: Debt issuance costs 26.9 33.4 Long-term debt, net $ 2,974.1 $ 3,085.7

Derivatives (Tables)

Derivatives (Tables)	9 Months Ended
	Sep. 30, 2022
Derivative Instruments and Hedging Activities Disclosure [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 gains and losses into net income from accumulated other comprehensive income (loss) for those derivative instruments designated as cash flow hedges under Accounting Standards Codification (ASC) 815 - Derivatives and Hedging : Location Gain (Loss) Reclassified During Total of Financial Gain Expected of Gain (Loss) Three Months Ended Nine Months Ended Statement to be Reclassified Reclassified into September 30, September 30, Line Item During the Net Income 2022 2021 2022 2021 2022 Next 12 Months (in millions) Currency forward contracts Cost of Goods Sold $ 1.5 $ 1.1 $ 4.6 $ 5.2 $ 3,872.0 $ 5.6 Fixed-to-fixed cross-currency swap Other Income (Expense), net 13.8 6.0 31.7 14.0 (4.4) 0.3 Variable-to-fixed interest rate swap Interest Expense (0.1) (3.5) (3.5) (11.4) (132.2) 5.3 See Note 12 - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (AOCI) for amounts recognized in other comprehensive income (loss) during the three and nine months ended September 30, 2022 and 2021. The following table summarizes the amount and location of gains and losses recognized in the Condensed Consolidated Statements of Operations for those derivative instruments not designated as hedging instruments under ASC 815: Location Gain (Loss) Recognized During Total of Financial of Gain (Loss) Three Months Ended Nine Months Ended Statement Recognized in September 30, September 30, Line Item Net Income 2022 2021 2022 2021 2022 (in millions) Currency forward contracts Other Income (Expense), net $ 0.3 $ (0.5) $ 1.4 $ (0.1) $ (4.4)

Fair Value (Tables)

Fair Value (Tables)	9 Months Ended
	Sep. 30, 2022
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The estimated carrying 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: Fair Value September 30, 2022 December 31, 2021 Input (in millions) Balance Sheet Classification Cash equivalents $ 292.0 $ 196.5 Level 1 Prepaid expenses and other Cash flow hedges - currency forward contracts 5.7 2.2 Level 2 Cash flow hedges - variable-to-fixed interest rate swap 2.5 1.9 Level 2 Nondesignated - currency forward contracts 0.2 0.2 Level 2 Other assets and deferred charges Cash flow hedges - currency forward contracts 1.6 1.4 Level 2 Cash flow hedges - fixed-to-fixed cross-currency swap 15.3 — Level 2 Cash flow hedges - variable-to-fixed interest rate swap 9.4 2.2 Level 2 Investment in equity securities 3.4 27.4 Level 1 Accrued expenses and other Cash flow hedges - currency forward contracts — 0.3 Level 2 Cash flow hedges - variable-to-fixed interest rate swap — 9.6 Level 2 Postretirement benefits and other long-term liabilities Cash flow hedges - currency forward contracts 0.1 0.6 Level 2 Cash flow hedges - fixed-to-fixed cross-currency swap — 3.7 Level 2 Cash flow hedges - variable-to-fixed interest rate swap — 12.7 Level 2
Fair Value, Financial Instruments not Carried at Fair Value [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: September 30, 2022 December 31, 2021 Carrying Amount Fair Value Carrying Amount Fair Value Input (in millions) Revolving Credit Facility $ — $ — $ — $ — Level 2 Term Loan A Facility 520.0 507.7 301.8 301.8 Level 2 Term Loan B Facility 750.0 731.3 850.0 847.9 Level 2 6.875% Notes due 2028 400.0 342.0 400.0 430.0 Level 2 6.50% Notes due 2027 500.0 422.5 500.0 519.4 Level 2 6.25% Notes due 2026 180.0 165.2 400.0 408.5 Level 2 5.00% Notes due 2029 600.0 450.0 600.0 588.0 Level 2

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Schedule of Net Benefit (Credits) Costs [Table Text Block]	The components of net periodic benefit cost (credit) are as follows: Pension Benefits Three Months Ended Nine Months Ended September 30, September 30, 2022 2021 2022 2021 (in millions) Service cost $ 0.5 $ 0.5 $ 1.4 $ 1.5 Interest cost 4.1 4.4 12.5 13.0 Expected asset return (8.0) (9.7) (23.8) (29.1) Amortized loss 2.0 2.7 5.8 8.1 Net periodic benefit credit $ (1.4) $ (2.1) $ (4.1) $ (6.5) Other Postretirement Benefits Three Months Ended Nine Months Ended September 30, September 30, 2022 2021 2022 2021 (in millions) Service cost $ 0.1 $ — $ 0.2 $ 0.2 Interest cost 2.1 2.1 6.3 6.3 Amortized loss 0.2 0.4 0.4 1.2 Amortized prior service credit (0.3) (0.3) (0.7) (1.1) Net periodic benefit cost $ 2.1 $ 2.2 $ 6.2 $ 6.6

Product Warranties (Tables)

Product Warranties (Tables)	9 Months Ended
	Sep. 30, 2022
Product Warranties Disclosures [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 Nine Months Ended September 30, September 30, 2022 2021 2022 2021 (in millions) Beginning balance $ 61.9 $ 64.3 $ 59.5 $ 66.7 Accruals 3.4 5.7 11.3 14.1 Payments (4.5) (11.7) (8.6) (14.3) Adjustment to prior period accruals (7.3) (0.4) (7.9) (8.4) Foreign currency translation (0.8) (0.3) (1.6) (0.5) Ending balance $ 52.7 $ 57.6 $ 52.7 $ 57.6

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Schedule of Income Tax Expense (Benefit) and Income Tax Rate	Our income tax benefit and effective income tax rate for the three and nine months ended September 30, 2022 and 2021 are as follows: Three Months Ended Nine Months Ended September 30, September 30, 2022 2021 2022 2021 (in millions) Income tax benefit $ (5.7) $ (13.6) $ (2.1) $ (2.4) Effective income tax rate (27.4) % 85.0 % (4.3) % (4.8) %

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2022
Earnings Per Share [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 Nine Months Ended September 30, September 30, 2022 2021 2022 2021 (in millions, except per share data) Numerator Net income (loss) $ 26.5 $ (2.4) $ 50.4 $ 52.2 Less: Net income attributable to participating securities (1.1) — (2.0) (2.0) Net income (loss) attributable to common shareholders - Basic and Dilutive $ 25.4 $ (2.4) $ 48.4 $ 50.2 Denominators Basic common shares outstanding - Weighted-average shares outstanding 119.6 118.5 119.3 118.5 Less: Participating securities (5.0) (4.4) (4.9) (4.6) Weighted-average common shares outstanding 114.6 114.1 114.4 113.9 Effect of dilutive securities - Dilutive stock-based compensation 1.5 — 0.9 0.2 Diluted shares outstanding - Adjusted weighted-average shares after assumed conversions 116.1 114.1 115.3 114.1 Basic EPS $ 0.22 $ (0.02) $ 0.42 $ 0.44 Diluted EPS $ 0.22 $ (0.02) $ 0.42 $ 0.44

Reclassifications out of Accu_2

Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2022
Reclassifications out of Accumulated Other Comprehensive Income (Loss) [Abstract]
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]	Reclassification adjustments and other activity impacting accumulated other comprehensive income (loss) during the three and nine months ended September 30, 2022 and September 30, 2021 are as follows (in millions) : Defined Benefit Plans Foreign Currency Translation Adjustments Unrecognized Gain (Loss) on Cash Flow Hedges Total Balance at June 30, 2022 $ (239.3) $ (147.6) $ 2.4 $ (384.5) Other comprehensive income (loss) before reclassifications — (34.4) 39.2 4.8 Income tax effect of other comprehensive income (loss) before reclassifications — — (7.8) (7.8) Amounts reclassified from accumulated other comprehensive income (loss) 1.9 (a) — (15.2) (b) (13.3) Income taxes reclassified into net income (0.4) — 2.9 2.5 Net change in accumulated other comprehensive income (loss) 1.5 (34.4) 19.1 (13.8) Balance at September 30, 2022 $ (237.8) $ (182.0) $ 21.5 $ (398.3) Defined Benefit Plans Foreign Currency Translation Adjustments Unrecognized Gain (Loss) on Cash Flow Hedges Total Balance at June 30, 2021 $ (306.7) $ (99.9) $ (15.3) $ (421.9) Other comprehensive income (loss) before reclassifications — (9.6) 2.5 (7.1) Income tax effect of other comprehensive income (loss) before reclassifications — — (1.2) (1.2) Amounts reclassified from accumulated other comprehensive loss 2.8 (a) — (3.6) (b) (0.8) Income taxes reclassified into net income (0.6) — 0.5 (0.1) Net change in accumulated other comprehensive loss 2.2 (9.6) (1.8) (9.2) Balance at September 30, 2021 $ (304.5) $ (109.5) $ (17.1) $ (431.1) (a) These amounts were reclassified from AOCI to Other income (expense), net for the three months ended September 30, 2022 and September 30, 2021. (b) The amounts reclassified from AOCI included $(1.5) million in cost of goods sold (COGS), $0.1 million in interest expense and $(13.8) million in Other income (expense), net for the three months ended September 30, 2022 and $(1.1) million in COGS, $3.5 million in interest expense and $(6.0) million in Other income (expense), net for the three months ended September 30, 2021. Defined Benefit Plans Foreign Currency Translation Adjustments Unrecognized Gain (Loss) on Cash Flow Hedges Total Balance at December 31, 2021 $ (241.9) $ (111.3) $ (11.6) $ (364.8) Other comprehensive income (loss) before reclassifications — (70.7) 73.5 2.8 Income tax effect of other comprehensive income (loss) before reclassifications — — (13.5) (13.5) Amounts reclassified from accumulated other comprehensive loss 5.5 (a) — (32.8) (b) (27.3) Income taxes reclassified into net income (1.4) — 5.9 4.5 Net change in accumulated other comprehensive income (loss) 4.1 (70.7) 33.1 (33.5) Balance at September 30, 2022 $ (237.8) $ (182.0) $ 21.5 $ (398.3) Defined Benefit Plans Foreign Currency Translation Adjustments Unrecognized Gain (Loss) on Cash Flow Hedges Total Balance at December 31, 2020 $ (311.0) $ (101.1) $ (20.1) $ (432.2) Other comprehensive income (loss) before reclassifications — (8.9) 13.5 4.6 Income tax effect of other comprehensive income (loss) before reclassifications — — (3.3) (3.3) Amounts reclassified from accumulated other comprehensive loss 8.2 (a) 0.5 (7.8) (b) 0.9 Income taxes reclassified into net income (1.7) — 0.6 (1.1) Net change in accumulated other comprehensive loss 6.5 (8.4) 3.0 1.1 Balance at September 30, 2021 $ (304.5) $ (109.5) $ (17.1) $ (431.1) (a) These amounts were reclassified from AOCI to Other income (expense), net for the nine months ended September 30, 2022 and September 30, 2021. (b) The amounts reclassified from AOCI included $(4.6) million in cost of goods sold (COGS), $3.5 million in interest expense and $(31.7) million in Other income (expense), net for the nine months ended September 30, 2022 and $(5.2) million in COGS, $11.4 million in interest expense and $(14.0) million in Other income (expense), net for the nine months ended September 30, 2021.

Disaggregation of Revenue (Tabl

Disaggregation of Revenue (Tables)	9 Months Ended
	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue from Contracts with Customers	Net sales recognized from contracts with customers, disaggregated by segment and geographical location, are presented in the following table for the three and nine months ended September 30, 2022 and 2021. Net sales are attributed to regions based on the location of production. Intersegment sales have been excluded from the table. Three Months Ended September 30, 2022 (in millions) Driveline Metal Forming Total North America $ 817.5 $ 332.0 $ 1,149.5 Asia 124.4 13.0 137.4 Europe 92.2 106.6 198.8 South America 25.7 23.8 49.5 Total $ 1,059.8 $ 475.4 $ 1,535.2 Three Months Ended September 30, 2021 Driveline Metal Forming Total North America $ 647.4 $ 279.9 $ 927.3 Asia 107.8 11.8 119.6 Europe 84.9 49.6 134.5 South America 29.5 2.2 31.7 Total $ 869.6 $ 343.5 $ 1,213.1 Nine Months Ended September 30, 2022 Driveline Metal Forming Total North America $ 2,465.1 $ 939.6 $ 3,404.7 Asia 334.5 31.9 366.4 Europe 298.6 243.7 542.3 South America 61.8 34.5 96.3 Total $ 3,160.0 $ 1,249.7 $ 4,409.7 Nine Months Ended September 30, 2021 Driveline Metal Forming Total North America $ 2,143.2 $ 876.6 $ 3,019.8 Asia 329.9 36.0 365.9 Europe 288.7 171.7 460.4 South America 67.7 7.7 75.4 Total $ 2,829.5 $ 1,092.0 $ 3,921.5 Contract Assets and Liabilities The following table summarizes our beginning and ending balances for accounts receivable and contract liabilities associated with our contracts with customers (in millions) : Accounts Receivable, Net Contract Liabilities (Current) Contract Liabilities (Long-term) December 31, 2021 $ 762.8 $ 28.1 $ 94.8 September 30, 2022 974.6 29.2 70.1 Increase/(decrease) $ 211.8 $ 1.1 $ (24.7)

Acquisitions and Dispositions_2

Acquisitions and Dispositions (Tables)	9 Months Ended
	Sep. 30, 2022
Business Acquisition [Line Items]
Schedule of Business Acquisitions, by Acquisition	The following represents the preliminary fair values of the assets acquired and liabilities assumed resulting from the acquisition, including measurement period adjustments recorded in the third quarter of 2022 (in millions) : Initial Allocation Adjustments September 30, 2022 Total consideration transferred $ 94.4 $ — $ 94.4 Cash and cash equivalents $ 14.3 $ — $ 14.3 Accounts receivable 33.1 0.6 33.7 Inventories 44.9 1.4 46.3 Prepaid expenses and other long-term assets 30.8 (0.5) 30.3 Deferred income tax assets 3.5 — 3.5 Property, plant and equipment 105.7 (0.1) 105.6 Total assets acquired $ 232.3 $ 1.4 $ 233.7 Accounts payable 33.3 0.2 33.5 Accrued expenses and other 26.3 0.6 26.9 Deferred income tax liabilities 1.0 — 1.0 Debt 23.4 — 23.4 Postretirement benefits and other long-term liabilities 42.3 (0.8) 41.5 Net assets acquired $ 106.0 $ 1.4 $ 107.4 Gain on bargain purchase of business $ 11.6 $ 1.4 $ 13.0

Segment Reporting (Tables)

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2022
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment [Table Text Block]	The following tables represent information by reportable segment for the three and nine months ended September 30, 2022 and 2021 (in millions) : Three Months Ended September 30, 2022 Driveline Metal Forming Total Sales $ 1,061.1 $ 591.2 $ 1,652.3 Less: Intersegment sales 1.3 115.8 117.1 Net external sales $ 1,059.8 $ 475.4 $ 1,535.2 Segment Adjusted EBITDA $ 146.4 $ 52.0 $ 198.4 Three Months Ended September 30, 2021 Driveline Metal Forming Total Sales $ 870.4 $ 422.7 $ 1,293.1 Less: Intersegment sales 0.8 79.2 80.0 Net external sales $ 869.6 $ 343.5 $ 1,213.1 Segment Adjusted EBITDA $ 128.4 $ 54.8 $ 183.2 Nine Months Ended September 30, 2022 Driveline Metal Forming Total Sales $ 3,163.6 $ 1,585.9 $ 4,749.5 Less: intersegment sales 3.6 336.2 339.8 Net external sales $ 3,160.0 $ 1,249.7 $ 4,409.7 Segment Adjusted EBITDA $ 420.3 $ 169.3 $ 589.6 Nine Months Ended September 30, 2021 Driveline Metal Forming Total Sales $ 2,831.9 $ 1,352.1 $ 4,184.0 Less: intersegment sales 2.4 260.1 262.5 Net external sales $ 2,829.5 $ 1,092.0 $ 3,921.5 Segment Adjusted EBITDA $ 450.2 $ 218.5 $ 668.7
Reconciliation of Assets from Segment to Consolidated [Table Text Block]	Total assets by reportable segment as of September 30, 2022 and December 31, 2021 were as follows (in millions) : September 30, 2022 Driveline Metal Forming Other Total Total Assets $ 2,898.8 $ 1,748.9 $ 1,031.9 $ 5,679.6 December 31, 2021 Driveline Metal Forming Other Total Total Assets $ 2,925.6 $ 1,576.9 $ 1,133.2 $ 5,635.7
Reconciliation of Total Segment Adjusted EBITDA to Income Before Income Taxes [Table Text Block]	The following table represents a reconciliation of Total Segment Adjusted EBITDA to consolidated income (loss) before income taxes for the three and nine months ended September 30, 2022 and 2021: Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 (in millions) Total segment adjusted EBITDA $ 198.4 $ 183.2 $ 589.6 $ 668.7 Interest expense (44.8) (49.7) (132.2) (150.7) Depreciation and amortization (124.8) (135.6) (367.1) (421.2) Restructuring and acquisition-related costs (7.9) (7.4) (26.4) (40.8) Loss on sale of business — — — (2.7) Unrealized gain (loss) on equity securities (2.3) 19.4 (24.0) 19.4 Debt refinancing and redemption costs (0.2) (31.6) (6.0) (34.0) Non-recurring items: Malvern Fire charges, net of recoveries 1.0 5.7 6.4 11.1 Acquisition-related fair value inventory adjustment — — (5.0) — Gain on bargain purchase of business 1.4 — 13.0 — Income (loss) before income taxes $ 20.8 $ (16.0) $ 48.3 $ 49.8

Organization and Basis of Pre_3

Organization and Basis of Presentation (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2022 USD ($) Countries Facilities
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Number of Facilities | Facilities			85
Number of Countries in which Entity Operates | Countries			18
CARES Act [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Proceeds from Income Tax Refunds	$ 5.4	$ 6
Deferred payments of social security tax			$ 7.6

Restructuring and Acquisition_3

Restructuring and Acquisition-Related Costs (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Restructuring Reserve [Roll Forward]
Restructuring reserve	$ 3.4	$ 11.5
Charges	19.2	35.9
Cash utilization	(15.2)	(43.6)
Restructuring reserve	7.4	3.8
Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve	0.7	1.7
Charges	3.4	2.7
Cash utilization	(1.3)	(3.9)
Restructuring reserve	2.8	0.5
Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve	2.7	9.8
Charges	15.8	33.2
Cash utilization	(13.9)	(39.7)
Restructuring reserve	$ 4.6	$ 3.3

Restructuring Reserve Narrative

Restructuring Reserve Narrative (Details) - USD ($) $ in Millions	9 Months Ended		16 Months Ended	33 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2022	Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 19.2	$ 35.9
Minimum [Member] | Forecast [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost					$ 20
Maximum [Member] | Forecast [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost					$ 30
Driveline [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	1.3	3.9
Metal Forming [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	12	3.1
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	3.4	2.7
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	15.8	$ 33.2
2020 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	12.4			$ 99.7
Emporium, Pennsylvannia
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 6.8		$ 10.5

Business Combinations, Separate

Business Combinations, Separately Recognized Transactions Table (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Restructuring and Related Activities [Abstract]
Business Combination, Acquisition Related Costs			$ 5.8	$ 0.3
Integration expenses			1.4	4.6
Total acquisition and integration charges			7.2	4.9
Restructuring and acquisition-related costs	$ 7.9	$ 7.4	$ 26.4	$ 40.8

Inventories (Details)

Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Inventory [Line Items]
Raw materials and work-in-progress	$ 398.2	$ 339.7
Finished goods	76.7	89.3
Gross inventories	474.9	429
Inventory valuation reserves	(28.1)	(18.6)
Inventories, net	$ 446.8	$ 410.4

Goodwill Rollforward (Details)

Goodwill Rollforward (Details) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($)
Goodwill [Roll Forward]
Goodwill	$ 183.8
Foreign currency translation	(4.5)
Goodwill	$ 179.3

Goodwill Narrative (Details)

Goodwill Narrative (Details) $ in Millions	Sep. 30, 2022 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Impaired, Accumulated Impairment Loss	$ 1,435.5

Intangible Assets Table (Detail

Intangible Assets Table (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,114.3		$ 1,114.3		$ 1,112.6
Accumulated Amortization	(478.1)		(478.1)		(415.4)
Net Carrying Amount	636.2		636.2		697.2
Amortization of intangible assets	21.5	$ 21.4	64.4	$ 64.3
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Current Fiscal Year	80		80
Finite-Lived Intangible Assets, Amortization Expense, Year Two	80		80
Finite-Lived Intangible Assets, Amortization Expense, Year Three	80		80
Finite-Lived Intangible Assets, Amortization Expense, Year Four	80		80
Finite-Lived Intangible Assets, Amortization Expense, Year Five	80		80
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Current Fiscal Year	85		85
Finite-Lived Intangible Assets, Amortization Expense, Year Two	85		85
Finite-Lived Intangible Assets, Amortization Expense, Year Three	85		85
Finite-Lived Intangible Assets, Amortization Expense, Year Four	85		85
Finite-Lived Intangible Assets, Amortization Expense, Year Five	85		85
Capitalized Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	51.3		51.3		47.3
Accumulated Amortization	(42)		(42)		(37)
Net Carrying Amount	9.3		9.3		10.3
Customer Platforms - Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	856.2		856.2		856.2
Accumulated Amortization	(348.9)		(348.9)		(301.3)
Net Carrying Amount	507.3		507.3		554.9
Customer Relationships - Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	53		53		53
Accumulated Amortization	(18.8)		(18.8)		(16.2)
Net Carrying Amount	34.2		34.2		36.8
Technology-Based Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	153.8		153.8		156.1
Accumulated Amortization	(68.4)		(68.4)		(60.9)
Net Carrying Amount	$ 85.4		$ 85.4		$ 95.2

Schedule of Long-Term Debt (Det

Schedule of Long-Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2022	Mar. 11, 2022	Dec. 31, 2021	Jul. 29, 2019
Debt Instrument [Line Items]
Total debt	$ 3,020.2		$ 3,137.9
Current portion of long-term debt	19.2		18.8
Long-term debt	3,001		3,119.1
Long-term debt, net	2,974.1		3,085.7
Term Loan A [Member]
Debt Instrument [Line Items]
Secured Debt	520	$ 520	301.8	$ 340
Term Loan B [Member]
Debt Instrument [Line Items]
Secured Debt	750		850	$ 1,550
6.875% Notes [Member]
Debt Instrument [Line Items]
Unsecured Debt	400		400
6.50% Notes [Member]
Debt Instrument [Line Items]
Unsecured Debt	500		500
6.25% Notes Due 2026 [Member]
Debt Instrument [Line Items]
Unsecured Debt	180		400
5.00% Notes due 2029 [Member]
Debt Instrument [Line Items]
Unsecured Debt	600		600
Total Debt Instruments excluding Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Issuance Costs	26.9		33.4
Multi Currency Credit Facility Member
Debt Instrument [Line Items]
Long-term Line of Credit	0		0
Foreign Credit Facilities and Other
Debt Instrument [Line Items]
Long-term Line of Credit	$ 70.2		$ 86.1

Senior Secured Credit Facilitie

Senior Secured Credit Facilities Narrative (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021	Mar. 11, 2022	Dec. 31, 2021	Jul. 29, 2019
Debt Instrument [Line Items]
Payments of Debt Issuance Costs							$ 4.4	$ 9.2
Term Loan A [Member]
Debt Instrument [Line Items]
Secured Debt	$ 520						520		$ 520	$ 301.8	$ 340
Repayments of Secured Debt				$ 12.7	$ 4.2	$ 4.3
Term Loan B [Member]
Debt Instrument [Line Items]
Secured Debt	750						750			$ 850	1,550
Repayments of Secured Debt	50	$ 25	$ 25		138.8	100
Multi Currency Credit Facility Member
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity									$ 925		$ 925
Multi Currency Credit Facility Member
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	893.5						893.5
Letters of Credit Outstanding, Amount	31.5						31.5
Secured Debt [Member] | Term Loan A [Member]
Debt Instrument [Line Items]
Write off of Deferred Debt Issuance Cost				$ 0.1
Secured Debt [Member] | Term Loan B [Member]
Debt Instrument [Line Items]
Write off of Deferred Debt Issuance Cost	$ 0.2	$ 0.2	$ 0.2
Secured Debt [Member] | Amended and Restated Credit Agreement
Debt Instrument [Line Items]
Payments of Debt Restructuring Costs							0.2
Interest Paid, Including Capitalized Interest, Operating and Investing Activities							1
Payments of Debt Issuance Costs							$ 4.4
Secured Debt [Member] | Term Loan A & Term Loan B
Debt Instrument [Line Items]
Write off of Deferred Debt Issuance Cost					$ 1.3	$ 1.1

Other Debt Disclosures Narrativ

Other Debt Disclosures Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jun. 01, 2022	Dec. 31, 2021	Sep. 20, 2021
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt			$ 222	$ 622.7
Payments of Debt Issuance Costs			$ 4.4	$ 9.2
Long-term Debt, Weighted Average Interest Rate, at Point in Time			5.80%			5.60%
Tekfor Group
Debt Instrument [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-Term Debt			$ 23.4		$ 23.4
Tekfor Group Debt
Debt Instrument [Line Items]
Repayments of Unsecured Debt			$ 10.7
Unsecured Debt [Member] | Tekfor Group
Debt Instrument [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-Term Debt					$ 23.4
Unsecured Debt [Member] | 6.25% Notes Due 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			6.25%
Repayments of Unsecured Debt	$ 220
Interest Paid, Including Capitalized Interest, Operating and Investing Activities	0.2
Write off of Deferred Debt Issuance Cost	1.8
Redemption Premium	$ 3.4
Unsecured Debt [Member] | 5.00% Notes due 2029 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5%		5%
Proceeds from issuance of long-term debt		$ 600
Payments of Debt Issuance Costs		$ 9.2
Unsecured Debt [Member] | 6.25% Notes due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.25%		6.25%
Repayments of Unsecured Debt		$ 700
Interest Paid, Including Capitalized Interest, Operating and Investing Activities		19.4
Write off of Deferred Debt Issuance Cost		9.6
Redemption Premium		$ 21.9
Debt Instrument, Repurchase Amount							$ 600
Foreign Credit Facilities [Member]
Debt Instrument [Line Items]
Long-term Line of Credit			$ 70.2			$ 86.1
Debt Instrument, Unused Borrowing Capacity, Amount			$ 64.7

Derivatives Narrative (Details)

Derivatives Narrative (Details) € in Millions, $ in Millions	Sep. 30, 2022 USD ($)	Sep. 30, 2022 EUR (€)	Jun. 27, 2022 USD ($)	Apr. 29, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 EUR (€)
Foreign Currency Forward & Foreign Currency Option Contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	$ 172.8				$ 164.7
Currency Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	195.9	€ 200			$ 226.9	€ 200
Fair value of asset at date of dedesignation				$ 9.7
Interest Rate Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair value of asset at date of dedesignation			$ 6.1
Interest Rate Swap [Member] | Debt [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	$ 500

Schedule of Derivatives (Detail

Schedule of Derivatives (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Cost of goods sold	$ 1,357.8	$ 1,047.5	$ 3,872	$ 3,338.8
Other income (expense), net	(1)	(3.1)	(4.4)	(1.3)
Interest expense	(44.8)	(49.7)	(132.2)	(150.7)
Foreign Exchange Forward [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 0.3	$ (0.5)	$ 1.4	$ (0.1)
Description of Location of Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments in Financial Statements	Other income (expense), net	Other income (expense), net	Other income (expense), net	Other income (expense), net
Foreign Exchange Forward [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Income Statement Location Gain (Loss) Reclassified from Accumulated OCI	Cost of goods sold	Cost of goods sold	Cost of goods sold	Cost of goods sold
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]	$ 1.5	$ 1.1	$ 4.6	$ 5.2
Foreign Exchange Forward [Member] | Cost of Sales [Member] | Cash Flow Hedging [Member] | Forecast [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Cash flow hedge gain (loss) to be reclassified within twelve months					$ 5.6
Currency Swap [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Income Statement Location Gain (Loss) Reclassified from Accumulated OCI	Other income (expense), net	Other income (expense), net	Other income (expense), net	Other income (expense), net
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]	$ 13.8	$ 6	$ 31.7	$ 14
Currency Swap [Member] | Nonoperating Income (Expense) [Member] | Cash Flow Hedging [Member] | Forecast [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Cash flow hedge gain (loss) to be reclassified within twelve months					0.3
Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Income Statement Location Gain (Loss) Reclassified from Accumulated OCI	Interest expense	Interest expense	Interest expense	Interest expense
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]	$ (0.1)	$ (3.5)	$ (3.5)	$ (11.4)
Interest Rate Swap [Member] | Interest Expense [Member] | Cash Flow Hedging [Member] | Forecast [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Cash flow hedge gain (loss) to be reclassified within twelve months					$ 5.3

Fair Value of Assets and Liabil

Fair Value of Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ / shares in Units, $ in Millions	Sep. 30, 2022	Dec. 31, 2021
REE Automotive Ltd.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	$ 3.4
Share Price	$ 0.68
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	$ 292	$ 196.5
Other Noncurrent Assets [Member] | Fair Value, Inputs, Level 1 [Member] | REE Automotive Ltd. | Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	3.4	27.4
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Prepaid expenses and other [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts, Asset, Carrying and Fair Value Disclosure	5.7	2.2
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts, Asset, Carrying and Fair Value Disclosure	1.6	1.4
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Accrued expenses and other [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts, Liability, Carrying and Fair Value Disclosure	0	0.3
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Postretirement benefits and other long-term liabilities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts, Liability, Carrying and Fair Value Disclosure	0.1	0.6
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member] | Prepaid expenses and other [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts, Asset, Carrying and Fair Value Disclosure	0.2	0.2
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Prepaid expenses and other [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Derivative Assets, at Carrying and Fair Value	2.5	1.9
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Derivative Assets, at Carrying and Fair Value	9.4	2.2
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Accrued expenses and other [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Derivative Liabilities, at Carrying and Fair Value	0	9.6
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Postretirement benefits and other long-term liabilities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Derivative Liabilities, at Carrying and Fair Value	0	12.7
Currency Swap [Member] | Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts, Asset, Carrying and Fair Value Disclosure	15.3	0
Currency Swap [Member] | Designated as Hedging Instrument [Member] | Postretirement benefits and other long-term liabilities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts, Liability, Carrying and Fair Value Disclosure	$ 0	$ 3.7

Fair Value of Debt (Details)

Fair Value of Debt (Details) - USD ($) $ in Millions	Sep. 30, 2022	Mar. 11, 2022	Dec. 31, 2021	Jul. 29, 2019
Multi Currency Credit Facility 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]
Long-term Line of Credit	$ 0		$ 0
Multi Currency Credit Facility 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]
Long-term Line of Credit	0		0
Term Loan A [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Secured Debt	520	$ 520	301.8	$ 340
Term Loan A [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]
Secured Debt	520		301.8
Term Loan A [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]
Secured Debt	507.7		301.8
Term Loan B [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Secured Debt	750		850	$ 1,550
Term Loan B [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]
Secured Debt	750		850
Term Loan B [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]
Secured Debt	731.3		847.9
6.875% Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unsecured Debt	400		400
6.875% Notes [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]
Unsecured Debt	400		400
6.875% Notes [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]
Unsecured Debt	342		430
6.50% Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unsecured Debt	500		500
6.50% Notes [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]
Unsecured Debt	500		500
6.50% Notes [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]
Unsecured Debt	422.5		519.4
6.25% Notes Due 2026 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unsecured Debt	180		400
6.25% Notes Due 2026 [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]
Unsecured Debt	180		400
6.25% Notes Due 2026 [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]
Unsecured Debt	165.2		408.5
5.00% Notes due 2029 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unsecured Debt	600		600
5.00% Notes due 2029 [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]
Unsecured Debt	600		600
5.00% Notes due 2029 [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]
Unsecured Debt	$ 450		$ 588

Schedule of Employee Benefit Pl

Schedule of Employee Benefit Plans Components of Net Periodic Benefit Cost (Credit) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 0.5	$ 0.5	$ 1.4	$ 1.5
Interest cost	4.1	4.4	12.5	13
Expected asset return	(8)	(9.7)	(23.8)	(29.1)
Amortized loss	2	2.7	5.8	8.1
Net periodic benefit credit	(1.4)	(2.1)	(4.1)	(6.5)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.1	0	0.2	0.2
Interest cost	2.1	2.1	6.3	6.3
Amortized loss	0.2	0.4	0.4	1.2
Amortized prior service credit	(0.3)	(0.3)	(0.7)	(1.1)
Net periodic benefit cost	$ 2.1	$ 2.2	$ 6.2	$ 6.6

Employee Benefit Plans and Othe

Employee Benefit Plans and Other Postretirement Benefit Plans Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Liability, Defined Benefit Pension Plan, Noncurrent	$ 113.9	$ 121.3
Liability, Other Postretirement Defined Benefit Plan, Noncurrent	476.2	$ 481.2
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	1
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	$ 16.5

Product Warranties (Details)

Product Warranties (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Product Warranty Rollforward
Beginning balance	$ 61.9	$ 64.3	$ 59.5	$ 66.7
Accruals	3.4	5.7	11.3	14.1
Payments	(4.5)	(11.7)	(8.6)	(14.3)
Adjustment to prior period accruals	(7.3)	(0.4)	(7.9)	(8.4)
Foreign currency translation	(0.8)	(0.3)	(1.6)	(0.5)
Ending balance	$ 52.7	$ 57.6	$ 52.7	$ 57.6

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions		3 Months Ended		4 Months Ended	9 Months Ended
	Jun. 01, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Income tax benefit		$ (5.7)	$ (13.6)		$ (2.1)	$ (2.4)
Effective income tax rate, continuing operations		(27.40%)	85%		(4.30%)	(4.80%)
Gain on bargain purchase of business		$ 1.4	$ 0		$ 13	$ 0
Asserted tax liability, Notice of deficiency		7		$ 7	7
Unrecognized tax benefit liability, including penalties and accrued interest		35.5		35.5	35.5		$ 23.4
Tekfor Group
Gain on bargain purchase of business	$ 11.6			$ 13	13
Unrecognized Tax Benefits, Increase Resulting from Acquisition	$ 12.6
Minimum [Member]
Income Tax Examination, Estimate of Possible Loss					275
Maximum [Member]
Income Tax Examination, Estimate of Possible Loss					325
CARES Act [Member]
Other Tax Expense (Benefit)			$ (5.2)			$ (5.2)
Non-US
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		$ (7.5)			$ (7.5)

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator
Net income (loss)	$ 26.5	$ (2.4)	$ 50.4	$ 52.2
Less: Net income attributable to participating securities	(1.1)	0	(2)	(2)
Net income (loss) attributable to common shareholders - Basic and Dilutive	$ 25.4	$ (2.4)	$ 48.4	$ 50.2
Denominators
Basic - Weighted-average shares outstanding	119.6	118.5	119.3	118.5
Basic - Less: Participating securities	(5)	(4.4)	(4.9)	(4.6)
Basic - Weighted-average common shares outstanding	114.6	114.1	114.4	113.9
Effect of dilutive securities - dilutive stock-based compensation	1.5	0	0.9	0.2
Diluted - Adjusted weighted-average shares after assumed conversions	116.1	114.1	115.3	114.1
Basic EPS	$ 0.22	$ (0.02)	$ 0.42	$ 0.44
Diluted EPS	$ 0.22	$ (0.02)	$ 0.42	$ 0.44

Reclassifications out of Accu_3

Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended								9 Months Ended
		Sep. 30, 2022		Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021		Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022		Sep. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Defined benefit plans, net current period other comprehensive income (loss)	[1]	$ 1.5				$ 2.2				$ 4.1		$ 6.5
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax		(34.4)				(9.6)				(70.7)		(8.4)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	[2]	19.1				(1.8)				33.1		3
Other comprehensive income (loss)		(13.8)				(9.2)				(33.5)		1.1
Cost of Sales [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax		(1.5)				(1.1)				(4.6)		(5.2)
Interest Expense [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax		0.1				3.5				3.5		11.4
Other Income [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax		(13.8)				(6)				(31.7)		(14)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), net of tax - Beginning balance		(239.3)			$ (241.9)	(306.7)			$ (311)	(241.9)		(311)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax		0				0				0		0
Income tax effect of other comprehensive income (loss) before reclassifications		0				0				0		0
Defined benefit plans, amounts reclassified from accumulated other comprehensive income (loss)		1.9	[3]			2.8	[3]			5.5	[4]	8.2	[4]
Income taxes reclassified into net income		(0.4)				(0.6)				(1.4)		(1.7)
Defined benefit plans, net current period other comprehensive income (loss)		1.5				2.2				4.1		6.5
Accumulated other comprehensive income (loss), net of tax - Ending balance		(237.8)		$ (239.3)		(304.5)		$ (306.7)		(237.8)		(304.5)
Accumulated Foreign Currency Adjustment Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), net of tax - Beginning balance		(147.6)			(111.3)	(99.9)			(101.1)	(111.3)		(101.1)
Foreign currency translation adjustments, other comprehensive income (loss) arising during period		(34.4)				(9.6)				(70.7)		(8.9)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax		0				0				0		0
Foreign currency translation adjustments, amounts reclassified from accumulated other comprehensive income (loss)		0				0				0		0.5
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Tax		0				0				0		0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax		(34.4)				(9.6)				(70.7)		(8.4)
Accumulated other comprehensive income (loss), net of tax - Ending balance		(182)		(147.6)		(109.5)		(99.9)		(182)		(109.5)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), net of tax - Beginning balance		2.4			(11.6)	(15.3)			(20.1)	(11.6)		(20.1)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax		39.2				2.5				73.5		13.5
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax		(7.8)				(1.2)				(13.5)		(3.3)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		(15.2)	[5]			(3.6)	[5]			(32.8)	[6]	(7.8)	[6]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax		2.9				0.5				5.9		0.6
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax		19.1				(1.8)				33.1		3
Accumulated other comprehensive income (loss), net of tax - Ending balance		21.5		2.4		(17.1)		(15.3)		21.5		(17.1)
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), net of tax - Beginning balance		(384.5)			(364.8)	(421.9)			(432.2)	(364.8)		(432.2)
Other comprehensive income (loss) arising during period, total		4.8				(7.1)				2.8		4.6
Other Comprehensive Income (Loss) before Reclassifications, Tax		(7.8)				(1.2)				(13.5)		(3.3)
Other comprehensive income (loss), reclassification before tax		(13.3)				(0.8)				(27.3)		0.9
Reclassification from AOCI, Current Period, Tax		2.5				(0.1)				4.5		(1.1)
Defined benefit plans, net current period other comprehensive income (loss)		1.5		1.3	1.3	2.2		2.2	2.1
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax		(34.4)		(42.3)	6	(9.6)		12.2	(11)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax		19.1		(1.7)	$ 15.7	(1.8)		5.1	$ (0.3)
Other comprehensive income (loss)		(13.8)				(9.2)				(33.5)		1.1
Accumulated other comprehensive income (loss), net of tax - Ending balance		$ (398.3)		$ (384.5)		$ (431.1)		$ (421.9)		$ (398.3)		$ (431.1)
[1]Amounts are net of tax of $(0.4) million and $(1.4) million for the three and nine months ended September 30, 2022, and $(0.6) million and $(1.7) million for the three and nine months ended September 30, 2021, respectively.[2]Amounts are net of tax of $(4.9) million and $(7.6) million for the three and nine months ended September 30, 2022, and $(0.7) million and $(2.7) million for the three and nine months ended September 30, 2021, respectively.[3]These amounts were reclassified from AOCI to Other income (expense), net for the three months ended September 30, 2022 and September 30, 2021.[4]These amounts were reclassified from AOCI to Other income (expense), net for the nine months ended September 30, 2022 and September 30, 2021.[5]The amounts reclassified from AOCI included $(1.5) million in cost of goods sold (COGS), $0.1 million in interest expense and $(13.8) million in Other income (expense), net for the three months ended September 30, 2022 and $(1.1) million in COGS, $3.5 million in interest expense and $(6.0) million in Other income (expense), net for the three months ended September 30, 2021.[6]The amounts reclassified from AOCI included $(4.6) million in cost of goods sold (COGS), $3.5 million in interest expense and $(31.7) million in Other income (expense), net for the nine months ended September 30, 2022 and $(5.2) million in COGS, $11.4 million in interest expense and $(14.0) million in Other income (expense), net for the nine months ended September 30, 2021.

Revenue from Contracts with C_2

Revenue from Contracts with Customers Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Net sales	$ 1,535.2	$ 1,213.1	$ 4,409.7	$ 3,921.5
North America [Member]
Disaggregation of Revenue [Line Items]
Net sales	1,149.5	927.3	3,404.7	3,019.8
Asia [Member]
Disaggregation of Revenue [Line Items]
Net sales	137.4	119.6	366.4	365.9
Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	198.8	134.5	542.3	460.4
South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	49.5	31.7	96.3	75.4
Driveline [Member]
Disaggregation of Revenue [Line Items]
Net sales	1,059.8	869.6	3,160	2,829.5
Driveline [Member] | North America [Member]
Disaggregation of Revenue [Line Items]
Net sales	817.5	647.4	2,465.1	2,143.2
Driveline [Member] | Asia [Member]
Disaggregation of Revenue [Line Items]
Net sales	124.4	107.8	334.5	329.9
Driveline [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	92.2	84.9	298.6	288.7
Driveline [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	25.7	29.5	61.8	67.7
Metal Forming [Member]
Disaggregation of Revenue [Line Items]
Net sales	475.4	343.5	1,249.7	1,092
Metal Forming [Member] | North America [Member]
Disaggregation of Revenue [Line Items]
Net sales	332	279.9	939.6	876.6
Metal Forming [Member] | Asia [Member]
Disaggregation of Revenue [Line Items]
Net sales	13	11.8	31.9	36
Metal Forming [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	106.6	49.6	243.7	171.7
Metal Forming [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 23.8	$ 2.2	$ 34.5	$ 7.7

Revenue from Contracts with C_3

Revenue from Contracts with Customers Contract Assets and Liabilities (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Accounts receivable, net	$ 974.6		$ 762.8
Deferred revenue, current	29.2		28.1
Deferred revenue, noncurrent	70.1		$ 94.8
Increase (decrease) in accounts receivable	211.8
Contract liability, current, increase (decrease)	1.1
Contract liability, noncurrent, increase (decrease)	(24.7)
Contract with customer, liability, revenue recognized	$ 23.3	$ 17.3

Acquisitions - Tekfor (Details)

Acquisitions - Tekfor (Details) - USD ($) $ in Millions		3 Months Ended		4 Months Ended	9 Months Ended
	Jun. 01, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021
Business Acquisition [Line Items]
Gain on bargain purchase of business		$ 1.4	$ 0		$ 13	$ 0
Fair Value Inventory Adjustment for Tekfor Aquisition		0	$ 0		5	$ 0
Tekfor Group
Business Acquisition [Line Items]
Business Acquisition, Name of Acquired Entity	Tekfor Group
Business Combination, Consideration Transferred	$ 94.4			$ 94.4
Business Acquisition, Description of Acquired Entity	Tekfor Group manufactures high-performance components, modules and fasteners, including traditional powertrain and driveline components (for both internal combustion and hybrid applications), and e-mobility components. Our acquisition of Tekfor contributes to diversifying our geographic and customer sales mix, while also increasing our electrification product portfolio.
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred		0
Cash and cash equivalents	$ 14.3	14.3		14.3	14.3
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Cash and cash equivalents		0
Accounts receivable	33.1	33.7		33.7	33.7
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts receivable		0.6
Inventory	44.9	46.3		46.3	46.3
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory		1.4
Prepaid expenses and other long-term assets	30.8	30.3		30.3	30.3
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Prepaid expenses and other long-term assets		(0.5)
Deferred income tax assets	3.5	3.5		3.5	3.5
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred income tax assets		0
Property, plant and equipment	105.7	105.6		105.6	105.6
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment		(0.1)
Total assets acquired	232.3	233.7		233.7	233.7
Business Combination, Provisional Information, Initial Accounting Incomplete, Assets		1.4
Accounts payable	33.3	33.5		33.5	33.5
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts payable		0.2
Accrued expenses and other	26.3	26.9		26.9	26.9
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accrued expenses and other		0.6
Deferred income tax liabilities	1	1		1	1
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred income tax liabilities		0
Debt	23.4	23.4		23.4	23.4
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Debt		0
Postretirement benefits and other long-term liabilities	42.3	41.5		41.5	41.5
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Postretirement benefits and other long-term liabilities		(0.8)
Net assets acquired	106	107.4		107.4	107.4
Business Combination, Provisional Information, Initial Accounting Incomplete, Net Assets		1.4
Gain on bargain purchase of business	$ 11.6			13	$ 13
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Gain on bargain purchase of business		$ 1.4
Business Combination, Bargain Purchase, Gain Recognized, Description	The gain on bargain purchase of business was primarily the result of current macroeconomic factors such as the supply chain disruptions impacting the automotive industry, including the conflict between Russia and Ukraine, the semiconductor supply shortage, and increasing input costs, including materials, freight and utilities.
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual				121
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual				10
Fair Value Inventory Adjustment for Tekfor Aquisition				$ 5

Acquisitions - Pro Forma (Detai

Acquisitions - Pro Forma (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		4 Months Ended	9 Months Ended
	Jun. 01, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Business Combination, Acquisition Related Costs					$ 5.8	$ 0.3
Gain on bargain purchase of business		$ 1.4	$ 0		13	0
Tekfor Group
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Business Acquisition, Pro Forma Revenue					4,550	4,200
Business Acquisition, Pro Forma Net Income (Loss)					$ 40	$ 75
Business Acquisition, Pro Forma Earnings Per Share, Diluted					$ 0.33	$ 0.63
Business Acquisition, Pro Forma Disclosure, Nonrecurring Amount						$ 15
Fair Value Inventory Adjustment from Acquisition of Tekfor, net of tax					$ 4
Business Combination, Acquisition Related Costs					5
Gain on bargain purchase of business	$ 11.6			$ 13	13
Net adjustments reclassified in Pro Forma Net Income					$ 4

Acquisitions - Emporium (Detail

Acquisitions - Emporium (Details) - Emporium, Pennsylvannia $ in Millions	May 17, 2021 USD ($)
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	$ 14.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory	5.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Equipment	9
Business Combination, Consideration Transferred	14.9
Business Combination, Consideration Transferred, Cash Paid	4.9
Business Combination, Consideration Transferred, Liabilities Incurred	10
Business Combination, Consideration Transferred, Liabilities Incurred, annual amount	$ 2.5

Dispositions (Details)

Dispositions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Business Combination and Asset Acquisition [Abstract]
Proceeds from Divestiture of Businesses				$ 2.6
Loss on sale of business	$ 0	$ 0	$ 0	$ 2.7

Manufacturing Facility Fire a_2

Manufacturing Facility Fire and Insurance Recovery (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended		12 Months Ended	24 Months Ended
	Dec. 31, 2020	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Sep. 30, 2022
Insurance Recoveries [Abstract]
Insurance Deductible Expense					$ 1
Business interruption charges		$ 2.2			54.6
Insurance Recoveries Estimated		8.6			90.1
Proceeds from Insurance Settlement, Operating and Investing Activities	$ 11.1	14		$ 59.1	84.2
Proceeds from Insurance Settlement, Operating Activities		7.7
Proceeds from Insurance Settlement, Investing Activities		6.3	$ 23.1
Gain (Loss) Related to Insurance Settlement		6.4
Loss Contingency, Receivable		$ 5.9			5.9
Tangible Asset Impairment Charges					$ 27

Sales and Segment Adjusted EBIT

Sales and Segment Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Sales	$ 1,652.3	$ 1,293.1	$ 4,749.5	$ 4,184
Less: intersegment sales	117.1	80	339.8	262.5
Net external sales	1,535.2	1,213.1	4,409.7	3,921.5
Segment Adjusted EBITDA	198.4	183.2	589.6	668.7
Driveline [Member]
Segment Reporting Information [Line Items]
Sales	1,061.1	870.4	3,163.6	2,831.9
Less: intersegment sales	1.3	0.8	3.6	2.4
Net external sales	1,059.8	869.6	3,160	2,829.5
Segment Adjusted EBITDA	146.4	128.4	420.3	450.2
Metal Forming [Member]
Segment Reporting Information [Line Items]
Sales	591.2	422.7	1,585.9	1,352.1
Less: intersegment sales	115.8	79.2	336.2	260.1
Net external sales	475.4	343.5	1,249.7	1,092
Segment Adjusted EBITDA	$ 52	$ 54.8	$ 169.3	$ 218.5

Total Assets by Segment (Detail

Total Assets by Segment (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Assets	$ 5,679.6	$ 5,635.7
Driveline [Member]
Segment Reporting Information [Line Items]
Assets	2,898.8	2,925.6
Metal Forming [Member]
Segment Reporting Information [Line Items]
Assets	1,748.9	1,576.9
Other Segments
Segment Reporting Information [Line Items]
Assets	$ 1,031.9	$ 1,133.2

Reconciliation of Total Segment

Reconciliation of Total Segment Adjusted EBITDA to Income Before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Total segment adjusted EBITDA	$ 198.4	$ 183.2	$ 589.6	$ 668.7
Interest expense	(44.8)	(49.7)	(132.2)	(150.7)
Depreciation and amortization	(124.8)	(135.6)	(367.1)	(421.2)
Restructuring and acquisition-related costs	(7.9)	(7.4)	(26.4)	(40.8)
Loss on sale of business	0	0	0	(2.7)
Unrealized gain (loss) on equity securities	(2.3)	19.4	(24)	19.4
Debt refinancing and redemption costs	(0.2)	(31.6)	(6)	(34)
Malvern Fire charges, net of recoveries	1	5.7	6.4	11.1
Acquisition-related fair value inventory adjustment	0	0	(5)	0
Gain on bargain purchase of business	1.4	0	13	0
Income (loss) before income taxes	$ 20.8	$ (16)	$ 48.3	$ 49.8