Altra Industrial Motion (AIMC) 10-Q 26 Jul 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares shares in Millions	6 Months Ended
	Jun. 30, 2019	Jul. 31, 2019
Document And Entity Information [Abstract]
Entity Registrant Name	Altra Industrial Motion Corp.
Entity Central Index Key	0001374535
Trading Symbol	AIMC
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Document Type	10-Q
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	001-33209
Entity Tax Identification Number	61-1478870
Entity Address, Address Line One	300 Granite Street
Entity Address, Address Line Two	Suite 201
Entity Address, City or Town	Braintree
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02184
City Area Code	781
Local Phone Number	917-0600
Entity Common Stock, Shares Outstanding (in shares)		64,504,357
Entity Interactive Data Current	Yes
Entity Incorporation, State or Country Code	DE
Security Exchange Name	NASDAQ
Document Quarterly Report	true
Document Transition Report	false
Title of 12(b) Security	Common Stock

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 153.6	$ 169
Trade receivables, less allowance for doubtful accounts of $5.5 and $5.6 million at June 30, 2019 and December 31, 2018, respectively	269.6	259.8
Inventories	237.5	231.2
Income tax receivable	15	10.2
Prepaid expenses and other current assets	34.6	33.1
Assets held for sale		0.7
Total current assets	710.3	704
Property, plant and equipment, net	360.8	364.4
Intangible assets, net	1,546.5	1,585.7
Goodwill	1,686.1	1,662.3
Deferred income taxes	0.9	4.9
Other non-current assets	12.8	15.9
Operating lease right of use assets	40.4
Total assets	4,357.8	4,337.2
Current liabilities:
Accounts payable	156.5	175.8
Accrued payroll	54.5	57
Accruals and other current liabilities	80.5	79.6
Income tax payable	9.4	7.5
Current portion of long-term debt	19.2	17.2
Operating lease liabilities	14.3
Total current liabilities	334.4	337.1
Long-term debt - less current portion	1,642.5	1,690.9
Deferred income taxes	401.2	393.2
Pension liabilities	32.9	32
Long-term taxes payable	4.5	5.4
Other long-term liabilities	30.2	30.4
Operating lease liabilities, net of current portion	27.7
Commitments and Contingencies (Note 18)
Stockholders’ equity:
Common stock ($0.001 par value per share, 120.0 million shares authorized, 64.3 and 64.2 million shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively)	0.1	0.1
Additional paid-in capital	1,691.8	1,687.1
Retained earnings	274.5	232.6
Accumulated other comprehensive loss	(82)	(71.6)
Total stockholders’ equity	1,884.4	1,848.2
Total liabilities and stockholders’ equity	$ 4,357.8	$ 4,337.2

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 5.5	$ 5.6
Common stock, par value (in USD per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	120,000,000	120,000,000
Common stock, shares issued (in shares)	64,300,000	64,200,000
Common stock, shares outstanding (in shares)	64,300,000	64,200,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Net sales	$ 466.5	$ 237.3	$ 949.3	$ 477.7
Cost of sales	299.5	159.1	607.4	325.2
Gross profit	167	78.2	341.9	152.5
Operating expenses:
Selling, general and administrative expenses	92	43.4	182.9	90.5
Research and development expenses	14.7	6.2	30	12.7
Restructuring costs	3.2	0.6	5.5	1.5
Total operating expenses	109.9	50.2	218.4	104.7
Income from operations	57.1	28	123.5	47.8
Other non-operating income and expense:
Loss on settlement of pension plan				5.1
Interest expense, net	18.6	2.1	38.4	3.9
Other non-operating expense/(income), net	0.4	(0.3)	1.5	(0.4)
Total other non-operating (income) expense, net	19	1.8	39.9	8.6
Income before income taxes	38.1	26.2	83.6	39.2
Provision for income taxes	9.1	7.2	19.4	11.2
Net income	$ 29	$ 19	$ 64.2	$ 28
Weighted average shares, basic	64.3	29	64.3	29.1
Weighted average shares, diluted	64.5	29.1	64.5	29.2
Net income per share:
Basic	$ 0.45	$ 0.66	$ 1	$ 0.96
Diluted	0.45	0.65	1	0.96
Cash dividend declared per share	$ 0.17	$ 0.17	$ 0.34	$ 0.34

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 29	$ 19	$ 64.2	$ 28
Other Comprehensive income:
Foreign currency translation adjustment	4.9	(16.2)	(7.6)	(8.5)
Reclassification adjustment from loss on partial settlement of pension plan, net of tax				3.8
Change in pension liability adjustment, net of tax			(0.3)	0.6
Change in fair value of derivative financial instruments, net of tax	(14)	0.7	(2.5)	1.1
Total other comprehensive (loss) income:	(9.1)	(15.5)	(10.4)	(3)
Comprehensive income	$ 19.9	$ 3.5	$ 53.8	$ 25

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities
Net income	$ 64.2	$ 28
Adjustments to reconcile net income to net operating cash flows:
Depreciation	28.9	13.8
Amortization of intangible assets	35.4	4.9
Amortization of deferred financing costs	2.3	0.3
Loss on foreign currency, net	0.8
Loss on partial settlement of pension plan		5.1
Loss on disposal, impairment and other	0.2	0.3
Stock-based compensation	7	2.7
Changes in assets and liabilities, net of assets acquired:
Trade receivables	(10.2)	(13)
Inventories	(6.3)	(5.5)
Accounts payable, accrued payroll, accruals and current liabilities	(20.2)	2
Other current assets and liabilities	(4.5)	(3.9)
Other operating assets and liabilities	(1.5)	(5.6)
Net cash provided by operating activities	96.1	29.1
Cash flows from investing activities
Purchase of property, plant and equipment	(24.1)	(14.9)
A&S acquisition purchase price adjustment	(13.5)
Acquisition of Aluminium Die Casting, S.r.L.		(2.7)
Proceeds from sale of building	0.3
Net cash used in investing activities	(37.3)	(17.6)
Cash flows from financing activities
Payments on 2015 Revolving Credit Facility		(24.4)
Payments on Term Loan Facility	(50)
Dividend payments	(22)	(10)
Borrowing under 2015 Revolving Credit Facility		11
Payments of equipment, working capital notes, mortgages and other debts	(0.5)	(0.6)
Proceeds from issuance of China debt	2.4
Shares surrendered for tax withholding	(2.3)	(1.5)
Net cash used in financing activities	(72.4)	(25.5)
Effect of exchange rate changes on cash and cash equivalents	(1.8)	0.1
Net change in cash and cash equivalents	(15.4)	(13.9)
Cash and cash equivalents at beginning of period	169	52
Cash and cash equivalents at end of period	153.6	38.1
Cash paid during the period for:
Interest paid on borrowings	35.3	3.6
Income taxes paid	$ 24.4	$ 8.1

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Additional Paid in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2017	$ 396.7	$ 0	$ 223.3	$ 223.2	$ (49.9)
Beginning balance (in shares) at Dec. 31, 2017		29.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation and vesting of restricted stock, net of withholdings	1.2		1.2
Net income	28			28
Dividends declared	(10)			(10)
Change in fair value of derivative financial instruments, net of tax	1.1				1.1
Minimum pension adjustment, net of tax	4.4				4.4
Foreign currency translation adjustment	(8.5)				(8.5)
Ending balance at Jun. 30, 2018	412.9	$ 0	224.5	241.2	(52.9)
Ending balance (in shares) at Jun. 30, 2018		29.1
Beginning balance at Mar. 31, 2018	413	$ 0	223.2	227.2	(37.4)
Beginning balance (in shares) at Mar. 31, 2018		29.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation and vesting of restricted stock, net of withholdings	1.3		1.3
Net income	19			19
Dividends declared	(5)			(5)
Change in fair value of derivative financial instruments, net of tax	0.7				0.7
Foreign currency translation adjustment	(16.2)				(16.2)
Ending balance at Jun. 30, 2018	412.9	$ 0	224.5	241.2	(52.9)
Ending balance (in shares) at Jun. 30, 2018		29.1
Beginning balance at Dec. 31, 2018	1,848.2	$ 0.1	1,687.1	232.6	(71.6)
Beginning balance (in shares) at Dec. 31, 2018		64.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation and vesting of restricted stock, net of withholdings	4.7		4.7
Stock-based compensation and vesting of restricted stock, net of withholdings, (in shares)		0.1
Net income	64.2			64.2
Dividends declared	(22.3)			(22.3)
Change in fair value of derivative financial instruments, net of tax	(2.5)				(2.5)
Minimum pension adjustment, net of tax	(0.3)				(0.3)
Foreign currency translation adjustment	(7.6)				(7.6)
Ending balance at Jun. 30, 2019	1,884.4	$ 0.1	1,691.8	274.5	(82)
Ending balance (in shares) at Jun. 30, 2019		64.3
Beginning balance at Mar. 31, 2019	1,872.4	$ 0.1	1,688.5	256.7	(72.9)
Beginning balance (in shares) at Mar. 31, 2019		64.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation and vesting of restricted stock, net of withholdings	3.3		3.3
Net income	29			29
Dividends declared	(11.2)			(11.2)
Change in fair value of derivative financial instruments, net of tax	(14)				(14)
Foreign currency translation adjustment	4.9				4.9
Ending balance at Jun. 30, 2019	$ 1,884.4	$ 0.1	$ 1,691.8	$ 274.5	$ (82)
Ending balance (in shares) at Jun. 30, 2019		64.3

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Cash dividend declared	$ 0.17	$ 0.17	$ 0.34	$ 0.34
Retained Earnings [Member]
Cash dividend declared	$ 0.17	$ 0.17	$ 0.34	$ 0.34

Organization and Nature of Oper

Organization and Nature of Operations	6 Months Ended
	Jun. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization and Nature of Operations	1. Organization and Nature of Operations Headquartered in Braintree, Massachusetts, Altra Industrial Motion Corp. (the “Company,” “Altra,” “we,” or “our”) is a leading global designer, producer and marketer of a wide range of electro-mechanical power transmission and motion control (“PTMC”) products. The Company brings together strong brands with production facilities in seventeen countries. Altra’s leading brands include Ameridrives Couplings, Bauer Gear Motor, Bibby Turboflex, Boston Gear, Delroyd Worm Gear, Formsprag Clutch, Guardian Couplings, Huco, Industrial Clutch, Inertia Dynamics, Jacobs Vehicle Systems, Kilian Manufacturing, Kollmorgen, Lamiflex Couplings, Marland Clutch, Matrix, Nuttall Gear, Portescap, Stieber Clutch, Stromag, Svendborg Brakes, TB Wood’s, Thomson, Twiflex, Warner Electric, Warner Linear, and Wichita Clutch.

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation	2. Basis of Presentation The Company’s unaudited condensed consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and do not include all of the information and note disclosures required by generally accepted accounting principles in the United States, or GAAP. These statements should be read in conjunction with the financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018, filed with the U.S. Securities and Exchange Commission (the “SEC”) on March 1, 2019, as amended on March 29, 2019 and July 2, 2019 (the “2018 Annual Report on Form 10-K”). In the opinion of management, the accompanying unaudited condensed consolidated financial statements include all adjustments, consisting of normal recurring adjustments, necessary to present fairly the Company’s financial position and cash flows for the interim periods presented. The results are not necessarily indicative of future results. The Company considers events or transactions that occur after the balance sheet date but before the financial statements are issued to provide additional evidence relative to certain estimates or to identify matters that require additional disclosure. Certain prior year numbers have been adjusted to conform to the current year rounding convention of reporting financial data in millions of dollars, except as otherwise noted.

Recent Accounting Standards

Recent Accounting Standards	6 Months Ended
	Jun. 30, 2019
Accounting Changes And Error Corrections [Abstract]
Recent Accounting Standards	3. Recent Accounting Standards Recent Accounting Pronouncements In June 2016, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments On January 1, 2019 the Company adopted ASU 2016-02, Leases As permitted by the new lease standard, the Company elected (i) not to reevaluate land easements if they were not previously accounted for as leases, (ii) not to reassess prior conclusions about lease identification, lease classification and initial direct costs (iii) not to apply the recognition requirements to short-term leases, and (iv) not to separate non-lease components from associated lease components, for all classes of underlying assets. Upon adoption of the new lease standard, the Company recorded right of use assets of $46.7 million and lease liabilities of $48.2 million in connection with its operating leases.

Acquisition

Acquisition	6 Months Ended
	Jun. 30, 2019
Business Combinations [Abstract]
Acquisition	4. Acquisition On October 1, 2018, the Company and Fortive Corporation (“Fortive”) consummated the previously announced combination (the “Fortive Transaction”) of Altra with four operating companies from Fortive’s Automation & Specialty platform (the “A&S Business”), and as a result, the consolidated financial statements reflect the A&S Business’s results of operations from October 1, 2018 onward. The A&S Business, consisting of four key brands, Kollmorgen, Portescap, Thomson and Jacobs Vehicle Systems, designs, manufactures, markets and sells electromechanical and electronic motion control products, including standard and custom motors, drives and controls; linear motion systems, ball screws, linear bearings, clutches/brakes, linear actuators and mechanical components; and through Jacobs Vehicle Systems, supplemental braking systems for commercial vehicles. As of June 30, 2019, the allocation of the purchase price of the A&S Business is provisional. The fair value of all At Acquisition Date Measurement Period Adjustments At Acquisition Date (As Adjusted) Consideration transferred: Total cash consideration $ 1,003.4 $ — $ 1,003.4 Total equity consideration 1,458.7 — 1,458.7 A&S acquisition purchase price adjustment — 13.5 13.5 Fair value of consideration transferred $ 2,462.1 $ 13.5 $ 2,475.6 Recognized identifiable assets acquired and liabilities assumed: Less: cash on A&S balance sheet at 10/1/2018 54.1 (0.5 ) 53.6 Receivables 129.7 (0.8 ) 128.9 Inventory 89.1 (2.1 ) 87.0 Prepaids and other current assets 6.9 (0.2 ) 6.7 Property, plant and equipment 178.3 (1.0 ) 177.3 Intangibles 1,454.0 — 1,454.0 Other non-current assets 7.9 (0.4 ) 7.5 Accounts payable (98.9 ) 0.8 (98.1 ) Accrued payroll (15.2 ) 0.5 (14.7 ) Accrued expenses and other current liabilities (33.7 ) 0.1 (33.6 ) Pension liability and other post employment benefits (12.0 ) — (12.0 ) Deferred tax liability (355.7 ) (11.7 ) (367.4 ) Other long term liability (2.6 ) (0.3 ) (2.9 ) Senior unsecured notes assumed (400.0 ) — (400.0 ) Total identifiable net assets assumed 1,001.9 (15.6 ) 986.3 Goodwill $ 1,460.2 $ 29.1 $ 1,489.3 The excess of the purchase price over the fair value of the net assets acquired was recorded as goodwill, which is not deductible for income tax purposes. The goodwill in this acquisition is attributable to the Company’s expectation to achieve synergies, such as facility consolidations, global procurement efficiencies, the ability to cross-sell product, and the ability to penetrate certain geographic areas. Intangible assets acquired consist of: Customer relationships $ 1,025.0 Trade names and trademarks 209.0 Technology 204.0 In-process research and development ("IPR&D") 16.0 Total intangible assets $ 1,454.0 Customer relationships and technology are subject to amortization, and will be recognized on a straight-line basis over the estimated useful lives of 20 years and 7-10 years, respectively, which represents the anticipated period over which the Company estimates it will benefit from the acquired assets. The tradenames and trademarks are considered to have an indefinite life and will not be amortized. The major acquired technology IPR&D relates to the next generation of valvetrain technologies, which focus on improving engine brake performance, improving fuel efficiency and meeting future worldwide emissions regulations. The IPR&D projects are not currently amortized and will be reviewed for impairment at least annually and amortization will commence when the assets are placed into service. There was no evidence of impairment to IPR&D as of June 30, 2019. The Company recorded net sales from the A&S Business of $233.3 and $482.4 million for the three and six months ended June 30, 2019. The Company recorded net income from the A&S Business of $21.1 and $53.2 million for the three and six months ended June 30, 2019. Net income includes amortization expense from the A&S Business of $15.3 and $30.8 million for the three and six months ended June 30, 2019. The following table sets forth the unaudited pro forma results of operations of the Company for the quarter and year to date period ended June 30, 2018, as if the Company had acquired the A&S Business on January 1, 2018. The pro forma information contains the actual operating results of the Company and the A&S Business, adjusted to include the pro forma impact of (i) additional depreciation expense as a result of estimated depreciation based on the fair value of fixed assets; (ii) additional expense as a result of the estimated amortization of identifiable intangible assets and (iii) additional interest expense for borrowings associated with the A&S Acquisition. These pro forma amounts do not purport to be indicative of the results that would have actually been obtained if the acquisition occurred at the beginning of the period or that may be obtained in the future. Pro forma (unaudited) Quarter Ended June 30, Year To Date Ended June 30, 2018 2018 Total revenues $ 493.5 $ 984.5 Net income 37.1 63.3 Basic earnings per share $ 0.58 $ 0.99 Diluted earnings per share $ 0.58 $ 0.98

Lease Accounting

Lease Accounting	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Lease Accounting	5. Lease Accounting On January 1, 2019 the Company adopted ASU 2016-02, Leases We lease property and equipment under finance and operating leases. At June 30, 2019, the Company’s right-of-use (“ROU”) assets and lease liabilities for operating and finance leases totaled approximately $40.9 and $42.5 million, respectively. Finance lease ROU assets are included in non-current other assets and finance lease liabilities are included in current and non-current other liabilities on the Company’s condensed consolidated balance sheets. The impact of adopting the new lease standard was not material to the Company’s condensed consolidated statement of operations for the periods presented. Quantitative information regarding the Company’s leases is as follows: Year To Date Ended June 30, 2019 Lease cost (1) Operating lease cost 8.4 Short-term lease cost 0.2 Total lease cost $ 8.6 (1) Finance lease costs and variable lease costs are immaterial to the Company. The Company does not have lease or sub lease income. Maturities of Lease Liabilities Operating Leases Finance Leases 2019 $ 8.2 $ 0.1 2020 13.5 0.2 2021 8.2 0.2 2022 6.4 0.1 2023 4.4 — After 2023 4.9 — Total lease payments 45.6 0.6 Less interest (3.6 ) (0.1 ) Present value of lease liabilities $ 42.0 $ 0.5 Other Information: Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from finance leases $ 0.0 Operating cash flows from operating leases $ 8.5 Financing cash flows from finance leases $ 0.0 Weighted average remaining lease term - finance leases (in years) 3.30 Weighted average remaining lease term - operating leases (in years) 4.26 Average discount rate - finance leases 5.50 % Average discount rate - operating leases 3.46 % As previously disclosed in our 2018 Annual Report on Form 10-K and under Topic 840, future minimum lease payments for operating leases having initial or remaining noncancelable lease terms in excess of one year were as follows: Year ending December 31: Operating Leases Capital Leases 2019 $ 15.3 $ 0.2 2020 11.2 0.2 2021 7.8 0.2 2022 6.1 0.1 2023 4.4 — After 2023 5.1 — Total lease obligations 49.9 0.7 Less amounts representing interest — (0.1 ) Present value of minimum capital lease obligations $ 49.9 $ 0.6 Lease Accounting Policy Arrangements that are determined to be leases at inception are recognized in long-term ROU assets, current lease liabilities, and long-term lease liabilities in the condensed consolidated balance sheet at lease commencement. Operating lease ROU assets and operating lease liabilities are recognized based on the present value of the future fixed lease payments over the lease term at commencement date. As most of the Company’s leases do not provide an implicit rate, the Company applies its incremental borrowing rate based on the economic environment at commencement date in determining the present value of future payments. The operating lease ROU asset also includes any lease prepayments made and initial direct costs incurred and is reduced by lease incentives. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Lease expense for operating leases are recognized on a straight-line basis over the lease term.

Revenue Recognition

Revenue Recognition	6 Months Ended
	Jun. 30, 2019
Revenue From Contract With Customer [Abstract]
Revenue Recognition	6. Revenue Recognition We sell our products through three primary commercial channels: original equipment manufacturers (OEMs), industrial distributors and direct to end users. Each of our segments sells similar products, which are balanced across end-user industries including, without limitation, energy, food processing, general industrial, material handling, mining, transportation, industrial automation, robotics, medical devices, and turf & garden. The following table disaggregates our revenue for each reportable segment. The Company believes that disaggregating revenue into these categories achieves the disclosure objective to depict how the nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factors. Quarter Ended Year to Date Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Net Sales: Power Transmission Technologies $ 234.9 $ 237.3 $ 469.8 $ 477.7 Automation & Specialty 233.3 — 482.4 — Inter-segment eliminations (1.7 ) — (2.9 ) — Net sales $ 466.5 $ 237.3 $ 949.3 $ 477.7 Net sales by geographic region based on point of shipment origin are as follows: Net Sales Quarter Ended Year to Date Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 North America (primarily U.S.) $ 269.8 $ 119.0 $ 542.8 $ 244.7 Europe excluding Germany 79.9 42.5 161.7 86.6 Germany 56.8 48.8 119.0 98.2 Asia and other 60.0 27.0 125.8 48.2 Total $ 466.5 $ 237.3 $ 949.3 $ 477.7 The payment terms and conditions in our customer contracts vary. In some cases, customers will partially prepay for their goods; in other cases, after appropriate credit evaluations, payment will be due in arrears. In addition, there are constraints that cause variability in the ultimate consideration to be recognized. These constraints typically include early payment discounts, volume rebates, rights of return, surcharges, and other customer consolidation. A contract asset is created when the Company satisfies a performance obligation by transferring a promised good to the customer. Contract assets may represent conditional or unconditional rights to consideration. The right is conditional, and recorded as a contract asset, if the Company must first satisfy another performance obligation in the contract before it is entitled to payment from the customer. Contract assets are transferred to billed receivables once the right becomes unconditional. If the Company has the unconditional right to receive consideration from the customer, the contract asset is accounted for as a billed receivable and presented separately from other contract assets. A right is unconditional if nothing other than the passage of time is required before payment of that consideration is due. If the Company receives a customer payment prior to satisfying a performance obligation or in excess of estimates of what the Company expects to be entitled to, the payment is recorded as a contract liability. Contracts with payment in arrears are recognized as receivables. The opening and closing balances of the Company’s contract liability and receivables as of the year to date period ended June 30, 2019 are as follows: Deferred Revenue (Current) Accounts Receivable Beginning - January 1, 2019 $ 7.4 $ 259.8 Closing - June 30, 2019 8.1 269.6 Increase/(Decrease) $ 0.7 $ 9.8 In the three and six month periods ended June 30, 2019, the Company recognized $1.6 and $3.7 million of revenue related to our contract liabilities at January 1, 2019, respectively.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	7. Fair Value of Financial Instruments Fair value is determined based upon the exit price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants, as determined by either the principal market or the most advantageous market. Inputs used in the valuation techniques to derive fair values are classified based on a three-level hierarchy, as follows: • Level 1- Quoted prices in active markets for identical assets or liabilities. • Level 2- Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets with insufficient volume or infrequent transactions (less active markets); or model-derived. • Level 3- Unobservable inputs to the valuation methodology that are significant to the measurement of fair value of assets or liabilities. The Company considers all highly liquid investments purchased with a remaining maturity of three months or less to be cash equivalents and are classified as Level 1. The Company determines the fair value of financial instruments using quoted market prices whenever available. When quoted market prices are not available for various types of financial instruments (such as forwards, options and swaps), the Company uses standard models with market-based inputs, which take into account the present value of estimated future cash flows and the ability of the Company or the financial counterparty to perform. For interest rate and cross currency swaps, the significant inputs to these models are interest rate curves for discounting future cash flows and are adjusted for credit risk. For forward foreign currency contracts, the significant inputs are interest rate curves for discounting future cash flows and exchange rate curves of the foreign currency for translating future cash flows. See additional discussion of the Company’s use of financial instruments including cross-currency swaps and interest rate swaps included in Note 17. The carrying values of financial instruments, including accounts receivable, cash equivalents, accounts payable, and other accrued liabilities are carried at cost, which approximates fair value. Debt under the Altra Credit Agreement (as defined herein) of $1,270.0 million approximates the fair value due to the variable interest rate. Further, the agreement was negotiated in October 2018 and there have not been any significant changes in our credit rating. The carrying amount of the Notes (as defined herein) was $400 million and the estimated fair value of the Notes was $420.0 million at June 30, 2019.

Changes in Accumulated Other Co

Changes in Accumulated Other Comprehensive Loss by Component	6 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Changes in Accumulated Other Comprehensive Loss by Component	8. Changes in Accumulated Other Comprehensive Loss by Component The following is a reconciliation of changes in accumulated other comprehensive loss by component for the periods presented: Gains and Losses on Cash Flow Hedges Defined Benefit Pension Plans Cumulative Foreign Currency Translation Adjustment Total Accumulated Other Comprehensive Loss by Component, January 1, 2019 $ (12.9 ) $ (0.2 ) $ (58.5 ) $ (71.6 ) Net current-period Other Comprehensive Loss (2.5 ) (0.3 ) (7.6 ) (10.4 ) Accumulated Other Comprehensive Loss by Component, June 30, 2019 $ (15.4 ) $ (0.5 ) $ (66.1 ) $ (82.0 ) Gains and Losses on Cash Flow Hedges Defined Benefit Pension Plans Cumulative Foreign Currency Translation Adjustment Total Accumulated Other Comprehensive Loss by Component, January 1, 2018 $ (0.5 ) $ (3.7 ) $ (45.7 ) $ (49.9 ) Net current-period Other Comprehensive Income Gain/(Loss) 1.1 0.6 (8.5 ) (6.8 ) Reclassification adjustment from loss on partial settlement of pension plan, net of tax — 3.8 — 3.8 Accumulated Other Comprehensive Gain/(Loss) by Component, June 30, 2018 $ 0.6 $ 0.7 $ (54.2 ) $ (52.9 )

Net Income per Share

Net Income per Share	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Net Income per Share	9. Net Income per Share Basic earnings per share is based on the weighted average number of shares of common stock outstanding, and diluted earnings per share is based on the weighted average number of shares of common stock outstanding and all potentially dilutive common stock equivalents outstanding. Common stock equivalents are included in the per share calculations when the effect of their inclusion is dilutive. The following is a reconciliation of basic to diluted net income per share: Quarter Ended Year to Date Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Net income $ 29.0 $ 19.0 $ 64.2 $ 28.0 Shares used in net income per common share - basic 64.3 29.0 64.3 29.1 Incremental shares of unvested restricted common stock 0.2 0.1 0.2 0.1 Shares used in net income per common share - diluted 64.5 29.1 64.5 29.2 Earnings per share: Basic net income $ 0.45 $ 0.66 $ 1.00 $ 0.96 Diluted net income $ 0.45 $ 0.65 $ 1.00 $ 0.96 On October 1, 2018, upon consummation of the Fortive Transaction, the Company issued 35.0 million shares of Altra common stock pursuant to that certain Agreement and Plan of Merger and Reorganization (the “Merger Agreement”), dated March 7, 2018, among Altra, Fortive, McHale Acquisition Corp, and Stevens Holding Company, Inc. (“Stevens Holding”), and that certain Separation and Distribution Agreement, dated March 7, 2018, among Altra, Fortive and Stevens Holding (the “Distribution Agreement”). As a result, following the consummation of the Fortive Transaction, the total amount of issued and outstanding common stock was approximately 64.2 million

Inventories

Inventories	6 Months Ended
	Jun. 30, 2019
Inventory Disclosure [Abstract]
Inventories	10. Inventories Inventories at June 30, 2019 and December 31, 2018 consisted of the following: June 30, 2019 December 31, 2018 Raw materials $ 115.1 $ 103.0 Work in process 26.5 23.5 Finished goods 95.9 104.7 $ 237.5 $ 231.2

Goodwill and Intangible Assets

Goodwill and Intangible Assets	6 Months Ended
	Jun. 30, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	11. Goodwill and Intangible Assets Changes in goodwill from January 1, 2019 through June 30, 2019 were as follows: Power Transmission Technologies Automation & Specialty Total Net goodwill balance January 1, 2019 $ 410.2 $ 1,252.1 $ 1,662.3 Measurement period adjustment related to acquisition of A&S — 29.1 29.1 Impact of changes in foreign currency (0.4 ) (4.9 ) (5.3 ) Net goodwill balance June 30, 2019 $ 409.8 $ 1,276.3 $ 1,686.1 Other intangible assets as of June 30, 2019 and December 31, 2018 consisted of the following: June 30, 2019 December 31, 2018 Cost Accumulated Amortization Net Cost Accumulated Amortization Net Other intangible assets Intangible assets not subject to amortization: Tradenames and trademarks $ 261.6 $ — $ 261.6 $ 262.0 $ — $ 262.0 In-process research and development 16.0 — 16.0 16.0 — 16.0 Intangible assets subject to amortization: Customer relationships 1,195.6 113.6 1,082.0 1,196.4 91.0 1,105.4 Product technology and patents 210.1 23.2 186.9 212.9 10.6 202.3 Total intangible assets $ 1,683.3 $ 136.8 $ 1,546.5 $ 1,687.3 $ 101.6 $ 1,585.7 The Company recorded $17.6 million and $2.4 million of amortization expense in the quarters ended June 30, 2019 and 2018, respectively; and, recorded $35.4 million and $4.9 million of amortization expense in the year to date periods ended June 30, 2019 and 2018. The estimated amortization expense for intangible assets is approximately $35.4 million for the remainder of 2019, $70.7 million in each of the next four years and then $950.7 million thereafter.

Warranty Costs

Warranty Costs	6 Months Ended
	Jun. 30, 2019
Guarantees [Abstract]
Warranty Costs	12. Warranty Costs The contractual warranty period of the Company's products generally ranges from three months to two years with certain warranties extending for longer periods. Estimated expenses related to product warranties are accrued at the time products are sold to customers and are recorded in accruals and other current liabilities on the unaudited condensed consolidated balance sheets. Estimates are established using historical information as to the nature, frequency and average costs of warranty claims. Changes in the carrying amount of accrued product warranty costs for each of the quarters ended June 30, 2019 and 2018 are as follows: June 30, 2019 June 30, 2018 Balance at beginning of period $ 9.4 $ 7.5 Accrued current period warranty expense 2.0 0.5 Payments and adjustments (1.2 ) (1.4 ) Balance at end of period $ 10.2 $ 6.6

Debt

Debt	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Debt	13. Debt Outstanding debt obligations at June 30, 2019 and December 31, 2018 were as follows. June 30, 2019 December 31, 2018 Debt: Term loan $ 1,270.0 $ 1,320.0 Notes 400.0 400.0 Mortgages and other 15.2 13.5 Finance leases 0.5 0.5 Total gross debt 1,685.7 1,734.0 Less: debt discount and deferred financing costs (24.0 ) (25.9 ) Total debt, net of deferred financing costs 1,661.7 1,708.1 Less: current portion of long-term debt (19.2 ) (17.2 ) Total long-term debt, net of unaccreted discount $ 1,642.5 $ 1,690.9 2018 Credit Agreement and Notes On October 1, 2018 (the “A&S Closing Date”), upon the closing of the Fortive Transaction the Company assumed $400 million aggregate principal amount of 6.125% senior notes due 2026 (the “Notes”). The Notes will mature on October 1, 2026. Interest on the Notes accrues from October 1, 2018, and the next interest payment date on the Notes will be due July 1, 2019. The Notes may be redeemed at the option of the issuer on or after October 1, 2023. The Notes are guaranteed on a senior unsecured basis by the Company and certain of its domestic subsidiaries. On the A&S Closing Date, the Company entered into a new Credit Agreement (the “Altra Credit Agreement”). The Altra Credit Agreement provides for a seven-year senior secured term loan in an aggregate principal amount of $1,340.0 million (the “Altra Term Loan Facility”) and a five-year senior secured revolving credit facility in an aggregate committed principal amount of $300.0 million (the “Altra Revolving Credit Facility” and together with the Altra Term Loan Facility, the “Altra Credit Facilities”). The proceeds of the Altra Term Loan Facility were used to (i) consummate Fortive’s transfer of certain non-U.S assets, liabilities and entities constituting a portion of the A&S Business to certain subsidiaries of Altra, and the Altra subsidiaries’ assumption of substantially all of the liabilities associated with the transferred assets (the “Direct Sales”), (ii) repay in full and extinguish all outstanding indebtedness for borrowed money under the 2015 Credit Agreement (as defined herein) and (iii) pay certain fees, costs, and expenses in connection with the consummation of the Fortive Transaction. The proceeds of the Altra Revolving Credit Facility will be used for working capital and general corporate purposes. The Altra Credit Facilities are guaranteed on a senior secured basis by the Company and certain of its domestic subsidiaries, subject to certain customary exceptions. Borrowings under the Altra Term Loan Facility will bear interest at a per annum rate equal to a “Eurocurrency Rate” plus 2.00%, in the case of Eurocurrency Rate borrowings, or equal to a “Base Rate” plus 1.00%, in the case of Base Rate borrowings. Borrowings under the Altra Revolving Credit Facility will initially bear interest at a per annum rate equal to a Eurocurrency Rate plus 2.00%, in the case of Eurocurrency Rate borrowings, or equal to a Base Rate plus 1.00%, in the case of Base Rate borrowings, and thereafter will bear interest at a per annum rate equal to a Eurocurrency Rate or Base Rate, as applicable, plus an interest rate spread determined by reference to a pricing grid based on the Company’s senior secured net leverage ratio. In addition, the Company will be required to pay fees that will fluctuate between 0.250% per annum to 0.375% per annum on the unused amount of the Altra Revolving Credit Facility, based upon the Company’s senior secured net leverage ratio. The interest rate on the Term Loan Facility and the Revolving Credit Facility was 4.40% at June 30, 2019. The Altra Credit Agreement contains usual and customary representations and warranties, and usual and customary affirmative and negative covenants, including limitations on liens, investments, restricted payments, additional indebtedness and asset sales and mergers. In addition, the Altra Credit Agreement requires that Altra maintain a specified maximum senior secured leverage ratio and a specified minimum interest coverage ratio. The obligations of the borrowers of the Altra Credit Facilities under the Altra Credit Agreement may be accelerated upon customary events of default, including non-payment of principal, interest, fees and other amounts, inaccuracy of representation and warranties, violation of covenants, cross default and cross acceleration, voluntary and involuntary bankruptcy or insolvency proceedings, inability to pay debts as they become due, material judgements, ERISA events, actual or asserted invalidity of security documents or guarantees and change in control. The Company incurred $29.9 million in issuance costs, which are amortized over the term of the debt as an adjustment to the effective interest rate on the outstanding borrowings. As of June 30, 2019, the Company had $1,270.0 million outstanding on the Altra Credit Agreement. As of June 30, 2019 and December 31, 2018, the Company had $4.4 million and $4.2 million in letters of credit outstanding, respectively. The Company had $295.6 million available to borrow under the Altra Credit Facilities at June 30, 2019. Second Amended and Restated Credit Agreement Prior to the Altra Credit Facilities, the Company maintained a revolving credit facility, in the amount of $425 million pursuant to the Second Amended and Restated Credit Agreement by and among the Company, Altra Industrial Motion Netherlands, B.V., one of the Company’s foreign subsidiaries, the lenders party thereto from time to time, J.P. Morgan Securities LLC, Wells Fargo Securities, LLC, and KeyBanc Capital Markets, Inc., as joint lead arrangers and joint bookrunners, and JPMorgan Chase Bank, N.A., as administrative agent (the “2015 Credit Agreement”). On October 1, 2018, in connection with the Fortive Transaction and upon entering into the Altra Credit Agreement, the 2015 Credit Agreement, was terminated and all outstanding indebtedness for borrowed money thereunder was repaid in full. Mortgages and Other Agreements The Company’s subsidiaries in Europe have entered into certain long-term fixed rate term loans that are generally secured by the local property, plant and equipment. The debt has interest rates that range from 1.79% to 2.5%, with various quarterly and monthly installments through 2028. During the year to date period ended June 30, 2019, one of the Company’s subsidiaries in China opened a new line of credit for approximately $7.5 million with a term life of one year. As of June 30, 2019 the Company had approximately $2.4 million outstanding on the line of credit. Financing Leases The Company leases certain equipment under finance lease arrangements, whose obligations are included in both short-term and long-term debt. Finance lease obligations amounted to approximately $0.5 million and $0.5 million at June 30, 2019 and December 31, 2018, respectively. ROU assets are included in property, plant and equipment with the related amortization recorded as depreciation expense.

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Jun. 30, 2019
Stockholders Equity Note [Abstract]
Stockholders' Equity	14. Stockholders’ Equity Common Stock Effective October 1, 2018, the Company amended its Articles of Incorporation to increase the number of authorized shares of Altra common stock from 90.0 million shares to 120.0 million shares. As of June 30, 2019 and December 31, 2018, there were 64.3 million and 64.2 million shares of common stock issued and outstanding, respectively. Preferred Stock On December 20, 2006, the Company amended and restated its certificate of incorporation authorizing 10.0 million shares of undesignated Preferred Stock (“Preferred Stock”). The Preferred Stock may be issued from time to time in one or more classes or series, the shares of each class or series to have such designations and powers, preferences, rights, qualifications, limitations and restrictions as determined by the Company’s Board of Directors. There was no Preferred Stock issued or outstanding at June 30, 2019 and December 31, 2018. Restricted Common Stock The 2014 Omnibus Incentive Plan (the “2014 Plan”) was approved by the Company’s stockholders at the Company’s 2014 Annual Meeting of Stockholders. The 2014 Plan provides for various forms of stock based compensation to our directors, executive personnel and other key employees and consultants. Under the 2014 Plan, the remaining total number of shares of common stock available for delivery pursuant to the grant of awards (“Awards”) was 1.7 million as of June 30, 2019. The restricted shares and restricted stock units issued pursuant to the 2014 Plan generally vest ratably over a period ranging from immediately to five years from the date of grant, provided, that the vesting of the restricted shares or restricted stock units may accelerate upon the occurrence of certain events. Common stock awarded under the 2014 Plan is generally subject to restrictions on transfer, repurchase rights, and other limitations and rights as set forth in the applicable award agreements. The fair value of the shares repurchased are measured based on the share price on the date of grant. The 2014 Plan permits the Company to grant, among other things, restricted stock, restricted stock units, and performance share awards to key employees. Certain awards include vesting based upon achievement of specified market conditions. Compensation expense recorded (in selling, general and administrative expense) during the quarters ended June 30, 2019 and 2018 was $3.5 million and $1.4 million, respectively. Compensation expense recorded (in selling, general and administrative expense) during the year to date periods ended June 30, 2019 and 2018 was $7.0 million and $2.7 million, respectively. The Company recognizes stock-based compensation expense on a straight-line basis for the shares vesting ratably under the plan and uses the graded-vesting method of recognizing stock-based compensation expense for the performance share awards based on the probability of the specific performance metrics being achieved over the requisite service period. The following tables set forth the activity of the Company’s restricted stock grants and stock options to date: Shares Weighted- average fair value Shares unvested January 1, 2019 823.6 $ 36.69 Shares granted 402.0 31.12 Shares for which restrictions lapsed (225.3 ) 30.50 Shares unvested June 30, 2019 1,000.3 $ 35.59 Shares Weighted- average fair value Options unvested January 1, 2019 — $ — Options granted 271.7 30.65 Options exercised — — Options outstanding June 30, 2019 271.7 $ 30.65 Total remaining unrecognized compensation cost is approximately $26.5 million as of June 30, 2019, and will be recognized over a weighted average remaining period of three years. The intrinsic value of these awards, as of June 30, 2019, was $34.7 million. Grant date fair value is based on the quoted price of the stock on the date of grant. Automation & Specialty Awards In October 2018, the Company issued 536,030 shares of restricted stock to certain Automation and Specialty employees as a result of the acquisition and in accordance with the terms of the Employee Matters Agreement, dated March 7, 2018, among Altra, Fortive and Stevens Holding. The aggregate fair value of these awards totaled $21 million. Based upon the vesting provisions of these awards, $3.1 million of the fair value was attributed to preacquisition services of the A&S employees and was recognized as purchase price consideration. The remaining compensation will be recognized over the remaining service period. Share Repurchase Program On October 19, 2016, our board of directors approved a share repurchase program authorizing the buyback of up to $30.0 million of the Company's common stock through December 31, 2019. The Company expects to purchase shares on the open market, through block trades, in privately negotiated transactions, in compliance with SEC Rule 10b-18 (including through Rule 10b5-1 plans), or in any other appropriate manner. The timing of the shares repurchased will be at the discretion of management and will depend on a number of factors, including price, market conditions and regulatory requirements. Shares acquired through the repurchase program will be retired. The Company retains the right to limit, terminate or extend the share repurchase program at any time without prior notice. The Company expects to fund any further repurchases of its common stock through a combination of cash on hand and cash generated by operations. The Company did not repurchase any shares during the year to date periods ended June 30, 2019 and 2018.

Restructuring, Asset Impairment

Restructuring, Asset Impairment, and Transition Expenses	6 Months Ended
	Jun. 30, 2019
Restructuring And Related Activities [Abstract]
Restructuring, Asset Impairment, and Transition Expenses	15. Restructuring, Asset Impairment, and Transition Expenses From time to time, the Company has initiated various restructuring programs and incurred severance and other restructuring costs. During 2015, the Company commenced a restructuring plan (“2015 Altra Plan”) as a result of weak demand in Europe and to make certain adjustments to improve business effectiveness, reduce the number of facilities and streamline the Company's cost structure. The actions taken pursuant to the 2015 Altra Plan included reducing headcount, facility consolidations, and limiting discretionary spending to improve profitability. For the quarter ended June 30, 2019, the Company didn’t record any expense related to the 2015 Altra Plan. The Company does not expect to incur any additional material restructuring expenses related to the 2015 Altra Plan. During 2017, the Company commenced a restructuring plan (“2017 Altra Plan”) as a result of the Stromag acquisition and to rationalize its global renewable energy business. The actions taken pursuant to the 2017 Altra Plan included reducing headcount, facility consolidations and the elimination of certain costs. The amounts for the year to date period ended June 30, 2019 were comprised of approximately $1.2 million in severance, $0.6 million in consolidation costs, $0.1 million in relocation costs, and $0.9 million in other restructuring costs, and are classified in the accompanying unaudited condensed consolidated statement of income as restructuring costs. The amounts for the quarter ended June 30, 2019 were comprised of approximately $0.7 million in severance, $0.3 million in consolidation costs, $0.1 million in relocation costs, and $0.7 million in other restructuring costs. The Company expects to incur an additional amount of approximately $1.0 to $3.0 million in expense under the 2017 Altra Plan through 2019. During 2019, the Company commenced a restructuring plan (“2019 Altra Plan”) to drive efficiencies, reduce the number of facilities and optimize its operating margin. The Company expects expenses related to workforce reductions, lease termination costs and other facility rationalization costs. The Company expects to incur $15 - $25 million in restructuring expenses under the 2019 Altra Plan over the next four years, primarily related to plant consolidation and headcount reductions. For the year to date period ended June 30, 2019, the Company recorded approximately $2.3 million in severance, $0.1 million in relocation costs and $0.3 million in other restructuring costs, respectively, under the 2019 Altra Plan, which are classified in the accompanying unaudited condensed consolidated statement of income as restructuring costs. For the quarter ended June 30, 2019, the Company recorded $1.2 million in severance and $0.2 million in other restructuring costs. The following is a reconciliation of the accrued restructuring costs between January 1, 2019 and June 30, 2019. 2017 Altra Plan 2019 Altra Plan Total All Plans Balance at January 1, 2019 $ 2.0 $ — $ 2.0 Restructuring expense incurred 1.0 1.3 2.3 Cash payments (1.5 ) (0.5 ) (2.0 ) Balance at March 31, 2019 1.5 0.8 2.3 Restructuring expense incurred 1.8 1.4 3.2 Cash payments (2.0 ) (0.7 ) (2.7 ) Balance at June 30, 2019 $ 1.3 $ 1.5 $ 2.8 The following is a reconcilation of the accrued restructuring costs between January 1, 2018 and June 30, 2018 . 2015 Altra Plan 2017 Altra Plan 2019 Altra Plan Total All Plans Balance at January 1, 2018 $ 0.8 $ 0.2 $ — $ 1.0 Restructuring expense incurred — 0.9 — 0.9 Cash payments (0.1 ) (0.4 ) — (0.5 ) Balance at March 31, 2018 0.7 0.7 — 1.4 Restructuring expense incurred — 0.6 — 0.6 Cash payments (0.2 ) (0.9 ) — (1.1 ) Balance at June 30, 2018 $ 0.5 $ 0.4 $ — $ 0.9 The following is a reconciliation of restructuring expense by segment for the year to date period ended June 30, 2019. 2017 Altra Plan 2019 Altra Plan Total All Plans Power Transmission Technologies $ 2.8 $ 0.1 $ 2.9 Automation & Specialty — 2.6 2.6 Balance at June 30, 2019 $ 2.8 $ 2.7 $ 5.5 The total accrued restructuring reserve as of June 30, 2019 relates to severance costs to be paid to former employees under the 2017Altra Plan and 2019 Altra Plan and is recorded in accruals and other liabilities on the accompanying unaudited condensed consolidated balance sheet.

Segments, Concentrations and Ge

Segments, Concentrations and Geographic Information	6 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Segments, Concentrations and Geographic Information	16. Segments, Concentrations and Geographic Information Segments The internal reporting structure used by our Chief Operating Decision Maker (“CODM”) to assess performance and allocate resources determines the basis for our reportable operating segments. Our CODM is our Chief Executive Officer, and he evaluates operations and allocates resources based on a measure of income from operations. Our operations are organized in two reporting segments that are aligned with key product types and end markets served, Power Transmission Technologies (“PTT”) and Automation & Specialty (“A&S”): • Power Transmission Technologies - PTT. This segment includes the following key product offerings: o Couplings, Clutches & Brakes. Couplings are the interface between two shafts, which enable power to be transmitted from one shaft to the other. Clutches in this segment are devices that use mechanical, hydraulic, pneumatic, or friction type connections to facilitate engaging or disengaging two rotating members. Brakes are combinations of interacting parts that work to slow or stop machinery. Products in this segment are generally used in heavy industrial applications and energy markets. o Electromagnetic Clutches & Brakes. Products in this segment include brakes and clutches that are used to electronically slow, stop, engage or disengage equipment utilizing electromagnetic friction type connections. Products in this segment are used in industrial and commercial markets including agricultural machinery, material handling, motion control, and turf & garden. o Gearing. Gears are utilized to reduce the speed and increase the torque of an electric motor or engine to the level required to drive a particular piece of equipment. Gears produced by the Company are primarily utilized in industrial applications. • Automation & Specialty – A&S. This segment includes the following key brands: o Kollmorgen: Provides rotary precision motion solutions, including servo motors, stepper motors, high performance electronic drives and motion controllers and related software, and precision linear actuators. These products are used in advanced material handling, aerospace and defense, factory automation, medical, packaging, printing, semiconductor, robotic and other applications. o Portescap: Provides high-efficiency miniature motors and motion control products, including brush and brushless DC motors, can stack motors and disc magnet motors. These products are used in medical, industrial power tool and general industrial equipment applications. o Thomson: Provides systems that enable and support the transition of rotary motion to linear motion. Products include linear bearings, guides, glides, lead and ball screws, industrial linear actuators, clutch brakes, precision gears, resolvers and inductors. These products are used in factory automation, medical, mobile off-highway, material handling, food processing and other niche applications. o Jacobs Vehicle Systems (JVS): Provides heavy-duty diesel engine brake systems and valve actuation mechanisms for the commercial vehicle market, including compression release, bleeder and exhaust brakes, including the “Jake Brake” engine braking system. These products are primarily used in heavy duty Class 8 truck applications. The segment information presented below for the prior periods has been reclassified to conform to the new presentation of our two reporting segments. The prior year reporting segments consisted of Couplings, Clutches & Brakes; Electromagnetic, Clutches, & Brakes; and Gearing and were aggregated into the PTT segment. Segment financial information and a reconciliation of segment results to unaudited condensed consolidated results are as follows: Quarters Ended Year to Date Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Net Sales: Power Transmission Technologies $ 234.9 $ 237.3 $ 469.8 $ 477.7 Automation & Specialty 233.3 — 482.4 — Inter-segment eliminations (1.7 ) — (2.9 ) — Net sales $ 466.5 $ 237.3 $ 949.3 $ 477.7 Income from operations: Segment earnings: Power Transmission Technologies $ 31.9 $ 33.2 $ 60.8 $ 61.5 Automation & Specialty 31.8 — 72.4 — Corporate expenses (1) (3.4 ) (4.6 ) (4.2 ) (12.2 ) Restructuring costs (3.2 ) (0.6 ) (5.5 ) (1.5 ) Income from operations $ 57.1 $ 28.0 $ 123.5 $ 47.8 Other non-operating (income) expense: Loss on settlement of pension plan — — — 5.1 Net interest expense 18.6 2.1 38.4 3.9 Other non-operating (income), net 0.4 (0.3 ) 1.5 (0.4 ) Total non-operating (income) expense $ 19.0 $ 1.8 $ 39.9 $ 8.6 Income before income taxes 38.1 26.2 83.6 39.2 Provision for income taxes 9.1 7.2 19.4 11.2 Net income $ 29.0 $ 19.0 $ 64.2 $ 28.0 (1) Certain expenses are maintained at the corporate level and not allocated to the segments. These include various administrative expenses related to the Company’s corporate headquarters, depreciation on capitalized software costs, non-capitalizable software implementation costs and acquisition related expenses. Selected information by segment (continued) Quarter Ended Year to Date Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Depreciation and amortization: Power Transmission Technologies $ 8.3 $ 8.4 $ 16.7 $ 17.0 Automation & Specialty 23.2 — 46.2 — Corporate 0.7 0.9 1.4 1.7 Total depreciation and amortization $ 32.2 $ 9.3 $ 64.3 $ 18.7 June 30, 2019 June 30, 2018 Total assets: Power Transmission Technologies $ 1,089.2 $ 884.0 Automation & Specialty 3,170.3 — Corporate 98.3 22.6 Total assets $ 4,357.8 $ 906.6 (2) Corporate assets are primarily cash and cash equivalents, tax related asset accounts, certain capitalized software costs, and property, plant and equipment. Net sales to third parties by geographic region are as follows: Net Sales Quarter Ended Year to Date Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 North America (primarily U.S.) $ 269.8 $ 119.0 $ 542.8 $ 244.7 Europe excluding Germany 79.9 42.5 161.7 86.6 Germany 56.8 48.8 119.0 98.2 Asia and other 60.0 27.0 125.8 48.2 Total $ 466.5 $ 237.3 $ 949.3 $ 477.7 Net sales to third parties are attributed to the geographic regions based on the country in which the shipment originates. Amounts attributed to the geographic regions for property, plant and equipment are based on the location of the entity, which holds such assets.

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Jun. 30, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	17. Derivative Financial Instruments The Company enters into derivative arrangements to manage changes in market conditions related to interest on debt obligations, foreign currency exposures and occasionally on commodity prices. Derivative instruments utilized during the period include interest rate and foreign currency swap agreements. All derivative instruments are recognized as either assets or liabilities on the balance sheet at fair value at the end of each period. The counterparties to the Company's contractual derivative agreements are all major global financial institutions. The Company is exposed to credit loss in the event of nonperformance by these counterparties. The Company continually monitors its positions and the credit ratings of its counterparties, and does not anticipate nonperformance by the counterparties. For designated hedging relationships, the Company formally documents the hedging relationship and its risk management objective and strategy for undertaking the hedge, the hedging instrument, the hedged item, the nature of the risk being hedged, how the hedging instrument's effectiveness in offsetting the hedged risk will be assessed prospectively and retrospectively. The Company also formally assesses, both at the hedge's inception and on an ongoing basis, whether the derivatives that are used in hedging transactions are highly effective in offsetting cash flows of hedged items. Cross Currency Interest Rate Swaps In December 2018, the Company entered into cross-currency swap agreements to hedge its net investment in Euro-denominated assets against future volatility in the exchange rate between the U.S. dollar and the Euro. By doing so, the Company synthetically converted a portion of its U.S. dollar-based long-term debt into Euro-denominated long-term debt. The agreements have a five-year maturity at notional amounts declining from $600.0 million to $360.0 million over the contract period. Under the terms of the swap agreements, the Company is to receive net interest payments at a fixed rate of 4.8255% and pay Euros at rates ranging from 2.19% to 2.315%. At inception, the cross-currency swaps were designated as net investment hedges. For a fixed-fixed cross currency swap at final maturity, (i) the total change in fair value of the swap will be the realized accruals of the pay and receive legs of the swap recorded in earnings and (ii) the final cash settlement of the principal at maturity recorded in cumulative translation adjustments (“CTA”). The accruals of the pay and receive legs of the swap represent the forward points or “carry” on the swap and the final cash settlement of the principal at maturity will be equal to the spot-to-spot change over its life. On a mark-to-market basis during its life, there will be three components to the change in fair value of the swap. The spot-to-spot change in fair value of the swap, non-discounted, based on the swap’s principal amount, will be recorded in CTA each period. The accrual of the pay and receive legs of the swap each period, representing the amortization in systematic fashion of the impact of changes in fair value of the swap from all other factors, will be recorded in earnings. The difference between the change in fair value of the excluded component of the cross currency swap and the amount recognized in earnings represented by accrual of the pay and receive legs of the swap will be recorded in CTA each period. This amount includes the change in fair value of the future interest payments and the impact of changes in discount factors as it impacts the value of the final principal exchange. As of the year to date periods ended June 30, 2019 and December 31, 2018, the Company recorded $11.2 million and $8.4 million to CTA, respectively, and recognized approximately $7.7 million and $0.8 million in interest income, net of the pay and receive legs of the swap, respectively. The Company has historically utilized its cross currency interest rate swaps to mitigate foreign currency and interest rate cash flow exposure related to its non-functional currency long-term debt held at the Company’s wholly owned Dutch subsidiary. The currency adjustments related to this loan were recorded in Other non-operating (income) expense, net. The offsetting gains and losses on the related derivative contracts were recorded in other non-operating (income) expense, net. In December of 2016 the Company entered into a cross-currency interest rate swap that converted $100.0 million of U.S. dollar denominated floating interest payments to functional currency (euro) fixed interest payments during the life of the hedging instrument. The Company designated the $100.0 million swap as a cash flow hedge, with the effective portion of the gain or loss on the derivative reported as a component of other comprehensive income (loss) and reclassified into earnings in the same period or periods during which the hedged transaction impacts earnings. In addition, the Company entered into two cross-currency interest rate swaps that converted an additional $70.0 million of the U.S. dollar denominated floating interest payments (one for $40 million and the other for $30 million) to functional currency (euro) floating interest payments during the life of the hedging instruments. The effective period of one of the cross-currency interest rate swaps, in the amount of $30 million, expired as of December 31, 2017. On October 2, 2018, the Company terminated both the $100 million and the $40 million cross-currency interest rate swap agreements and paid approximately $14.0 million to settle the swap agreements. Interest Rate Swaps In December 2018, the Company entered into an interest rate swap agreement designed to manage the cash flow risk caused by interest rate changes on the forecasted interest payments expected to occur related to a portion of its outstanding borrowings under the Altra Credit Agreement for a notional value of $600 million at 4.8255%. The Company recognized $1.0 million in interest expense as of the year to date period ended June 30, 2019. The effective period of the swap was December 4, 2018, and the maturity date is September 29, 2023. In January 2017, the Company entered into an interest rate swap agreement designed to fix the variable interest rate payable on a portion of its outstanding borrowings for a notional value of $50.0 million, at 1.625%. The effective date was January 31, 2017 and the maturity date is January 31, 2020. These interest rate swap agreements are designed to manage exposure to interest rates on the Company’s variable rate indebtedness. The Company recognizes all derivatives on its balance sheet at fair value. The Company has designated these interest rate swap agreements as cash flow hedges. Changes in the fair value of the swap will be recognized in other comprehensive income until the hedged items are recognized in earnings. The following table summarizes outstanding swaps that the Company has recorded at June 30, 2019. Initial US$ Date Derivative Notional Entered Financial Amount Fixed Rate Floating Leg Fixed Rate Floating Leg Settlement Effective into Instrument (millions) (swap counterparty) (swap counterparty) (Company) (Company) Dates Period of Swap 12/10/2018 Cross currency interest rate swap $ 240.0 4.8255% N/A 2.315% N/A Quarterly on the last day of each December, March, June, and September 12/10/2018 - 9/29/2023 12/10/2018 Cross currency interest rate swap $ 192.0 4.8255% N/A 2.235% N/A Quarterly on the last day of each December, March, June, and September 12/10/2018 - 9/29/2023 12/10/2018 Cross currency interest rate swap $ 108.0 4.8255% N/A 2.190% N/A Quarterly on the last day of each December, March, June, and September 12/10/2018 - 9/29/2023 12/10/2018 Cross currency interest rate swap $ 60.0 4.8255% N/A 2.290% N/A Quarterly on the last day of each December, March, June, and September 12/10/2018 - 9/29/2023 12/4/2018 Interest rate swap $ 600.0 4.8255% Variable rate 1- month USD LIBOR plus 2% N/A 1 Month USD- LIBOR- BBA plus 2% Monthly on the last business day of each month commencing with December 31, 2018 in accordance with Modified Following Business Day Convention 12/4/2018 - 9/29/2023 1/31/2017 Interest rate swap $ 50.0 N/A Variable rate 1- month USD LIBOR 1.625% USD N/A Monthly on the last banking day of each month commencing February 28, 2017 1/31/2017 - 1/31/2020 The following table summarizes the location and fair value, using Level 2 inputs (see Note 7 for a description of the fair value levels), of the Company's derivatives designated and not designated as hedging instruments in the unaudited condensed consolidated balance sheets (in millions). Balance Sheet Location June 30, 2019 December 31, 2018 Designated as hedging instruments: Cross currency swap agreements Other long-term (assets)/liabilities $ (2.9 ) $ 8.4 Interest rate swap agreement Other long-term (assets) (0.1 ) (0.5 ) Interest rate swap agreement Other long-term liabilities 21.2 7.9 $ 18.2 $ 15.8

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	18.Commitments and Contingencies General Litigation The Company is involved in various pending legal proceedings arising out of the ordinary course of business. These proceedings primarily involve commercial claims, product liability claims, personal injury claims, and workers’ compensation claims. With respect to these proceedings, management believes that the Company will prevail, has adequate insurance coverage or has established appropriate reserves to cover potential liabilities. Any costs that management estimates may be paid related to these proceedings or claims are accrued when the liability is considered probable and the amount can be reasonably estimated. There can be no assurance, however, as to the ultimate outcome of any of these matters, and if all or substantially all of these legal proceedings were to be determined adversely to the Company, there could be a material adverse effect on the results of operations, cash flows, or financial condition of the Company. We have established loss provisions for matters in which losses are probable and can be reasonably estimated. For matters where a reserve has not been established and for which we believe a loss is reasonably possible, as well as for matters where a reserve has been recorded but for which an exposure to loss in excess of the amount accrued is reasonably possible, we believe that such losses, individually and in the aggregate, will not have a material effect on our unaudited condensed consolidated financial statements. Our estimates regarding potential losses and materiality are based on our judgment and assessment of the claims utilizing currently available information. Although we will continue to reassess our reserves and estimates based on future developments, our objective assessment of the legal merits of such claims may not always be predictive of the outcome and actual results may vary from our current estimates. We will continue to consider the applicable guidance in ASC 450-20, based on the facts known at the time of our future filings, as it relates to legal contingencies, and will adjust our disclosures as may be required under the guidance. There were no material amounts accrued in the accompanying unaudited condensed consolidated balance sheets for potential litigation as of June 30, 2019 and December 31, 2018. The Company also risks exposure to product liability claims in connection with products it has sold and those sold by businesses that the Company acquired. Although in some cases third parties have retained responsibility for product liability claims relating to products manufactured or sold prior to the acquisition of the relevant business and in other cases the persons from whom the Company has acquired a business may be required to indemnify the Company for certain product liability claims subject to certain caps or limitations on indemnification, the Company cannot assure that those third parties will in fact satisfy their obligations with respect to liabilities retained by them or their indemnification obligations. If those third parties become unable to or otherwise do not comply with their respective obligations including indemnity obligations, or if certain product liability claims for which the Company is obligated were not retained by third parties or are not subject to these indemnities, the Company could become subject to significant liabilities or other adverse consequences. Moreover, even in cases where third parties retain responsibility for product liability claims or are required to indemnify the Company, significant claims arising from products that have been acquired could have a material adverse effect on the Company’s ability to realize the benefits from an acquisition, could result in the reduction of the value of goodwill that the Company recorded in connection with an acquisition, or could otherwise have a material adverse effect on the Company’s business, financial condition, or operations. Environmental There is contamination at some of the Company’s current facilities, primarily related to historical operations at those sites, for which the Company could be liable for the investigation and remediation under certain environmental laws. The potential for contamination also exists at other of the Company’s current or former sites, based on historical uses of those sites. The Company currently is not undertaking any material remediation or investigations and the costs or liability in connection with potential contamination conditions at these facilities cannot be predicted at this time because the potential existence of contamination has not been investigated or not enough is known about the environmental conditions or likely remedial requirements. Currently, other parties with contractual liability are addressing or have plans or obligations to address those contamination conditions that may pose a material risk to human health, safety or the environment. In addition, while the Company attempts to evaluate the risk of liability associated with these facilities at the time the Company acquired them, there may be environmental conditions currently unknown to the Company relating to prior, existing or future sites or operations or those of predecessor companies whose liabilities the Company may have assumed or acquired which could have a material adverse effect on the Company’s business. The Company is being indemnified, or expects to be indemnified by third parties subject to certain caps or limitations on the indemnification, for certain environmental costs and liabilities associated with certain owned or operated sites. Accordingly, based on the indemnification and the experience with similar sites of the environmental consultants who the Company has hired, the Company does not expect such costs and liabilities to have a material adverse effect on its business, operations or earnings. The Company cannot assure you, however, that those third parties will in fact satisfy their indemnification obligations. If those third parties become unable to, or otherwise do not, comply with their respective indemnity obligations, or if certain contamination or other liability for which the Company is obligated is not subject to these indemnities, the Company could become subject to significant liabilities. From time to time, the Company is notified that it is a potentially responsible party and may have liability in connection with off-site disposal facilities. To date, the Company has generally resolved matters involving off-site disposal facilities for a nominal sum but there can be no assurance that the Company will be able to resolve pending or future matters in a similar fashion. Termination of Defined Benefit Plan The Company commenced its plan to terminate the Altra Industrial Motion, Inc. Retirement Plan (the “Plan”), its frozen U.S. defined benefit pension plan in June 2017 and distributed a portion of the Plan assets during the fourth quarter of 2017 as a partial plan settlement. See Note 8, Pension and Other Employee Benefits, to the consolidated financial statements in our Annual Report on Form 10-K for the year ended December 31, 2017. During the first quarter of 2018, the Company completed the Plan termination and made a final contribution of $1.1 million to fully fund the benefit obligation prior to settlement. The Company settled the remaining benefit obligation of approximately $18.7 million by transferring the remaining Plan assets and liability obligations to a third party. The Company recorded an additional settlement loss of $5.1 million related to the Plan in the quarter ended March 31, 2018.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2019
Subsequent Events [Abstract]
Subsequent Events	19. Subsequent Events On July 22, 2019, the Company declared a dividend of $0.17 per share for the quarter ended September 30, 2019, payable on October 2, 2019 to stockholders of record as of September 18, 2019.

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The Company’s unaudited condensed consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and do not include all of the information and note disclosures required by generally accepted accounting principles in the United States, or GAAP. These statements should be read in conjunction with the financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018, filed with the U.S. Securities and Exchange Commission (the “SEC”) on March 1, 2019, as amended on March 29, 2019 and July 2, 2019 (the “2018 Annual Report on Form 10-K”). In the opinion of management, the accompanying unaudited condensed consolidated financial statements include all adjustments, consisting of normal recurring adjustments, necessary to present fairly the Company’s financial position and cash flows for the interim periods presented. The results are not necessarily indicative of future results. The Company considers events or transactions that occur after the balance sheet date but before the financial statements are issued to provide additional evidence relative to certain estimates or to identify matters that require additional disclosure. Certain prior year numbers have been adjusted to conform to the current year rounding convention of reporting financial data in millions of dollars, except as otherwise noted.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In June 2016, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments On January 1, 2019 the Company adopted ASU 2016-02, Leases As permitted by the new lease standard, the Company elected (i) not to reevaluate land easements if they were not previously accounted for as leases, (ii) not to reassess prior conclusions about lease identification, lease classification and initial direct costs (iii) not to apply the recognition requirements to short-term leases, and (iv) not to separate non-lease components from associated lease components, for all classes of underlying assets. Upon adoption of the new lease standard, the Company recorded right of use assets of $46.7 million and lease liabilities of $48.2 million in connection with its operating leases.
Lease Accounting Policy	Lease Accounting Policy Arrangements that are determined to be leases at inception are recognized in long-term ROU assets, current lease liabilities, and long-term lease liabilities in the condensed consolidated balance sheet at lease commencement. Operating lease ROU assets and operating lease liabilities are recognized based on the present value of the future fixed lease payments over the lease term at commencement date. As most of the Company’s leases do not provide an implicit rate, the Company applies its incremental borrowing rate based on the economic environment at commencement date in determining the present value of future payments. The operating lease ROU asset also includes any lease prepayments made and initial direct costs incurred and is reduced by lease incentives. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Lease expense for operating leases are recognized on a straight-line basis over the lease term.
Fair Value of Financial Instruments	Fair value is determined based upon the exit price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants, as determined by either the principal market or the most advantageous market. Inputs used in the valuation techniques to derive fair values are classified based on a three-level hierarchy, as follows: • Level 1- Quoted prices in active markets for identical assets or liabilities. • Level 2- Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets with insufficient volume or infrequent transactions (less active markets); or model-derived. • Level 3- Unobservable inputs to the valuation methodology that are significant to the measurement of fair value of assets or liabilities. The Company considers all highly liquid investments purchased with a remaining maturity of three months or less to be cash equivalents and are classified as Level 1. The Company determines the fair value of financial instruments using quoted market prices whenever available. When quoted market prices are not available for various types of financial instruments (such as forwards, options and swaps), the Company uses standard models with market-based inputs, which take into account the present value of estimated future cash flows and the ability of the Company or the financial counterparty to perform. For interest rate and cross currency swaps, the significant inputs to these models are interest rate curves for discounting future cash flows and are adjusted for credit risk. For forward foreign currency contracts, the significant inputs are interest rate curves for discounting future cash flows and exchange rate curves of the foreign currency for translating future cash flows. See additional discussion of the Company’s use of financial instruments including cross-currency swaps and interest rate swaps included in Note 17. The carrying values of financial instruments, including accounts receivable, cash equivalents, accounts payable, and other accrued liabilities are carried at cost, which approximates fair value. Debt under the Altra Credit Agreement (as defined herein) of $1,270.0 million approximates the fair value due to the variable interest rate. Further, the agreement was negotiated in October 2018 and there have not been any significant changes in our credit rating. The carrying amount of the Notes (as defined herein) was $400 million and the estimated fair value of the Notes was $420.0 million at June 30, 2019.
Warranty Costs	Warranty Costs The contractual warranty period of the Company's products generally ranges from three months to two years with certain warranties extending for longer periods. Estimated expenses related to product warranties are accrued at the time products are sold to customers and are recorded in accruals and other current liabilities on the unaudited condensed consolidated balance sheets. Estimates are established using historical information as to the nature, frequency and average costs of warranty claims.

Acquisition (Tables)

Acquisition (Tables)	6 Months Ended
	Jun. 30, 2019
Business Combinations [Abstract]
Schedule of Preliminary Purchase Price Allocation	The preliminary purchase price allocation below includes such adjustments. At Acquisition Date Measurement Period Adjustments At Acquisition Date (As Adjusted) Consideration transferred: Total cash consideration $ 1,003.4 $ — $ 1,003.4 Total equity consideration 1,458.7 — 1,458.7 A&S acquisition purchase price adjustment — 13.5 13.5 Fair value of consideration transferred $ 2,462.1 $ 13.5 $ 2,475.6 Recognized identifiable assets acquired and liabilities assumed: Less: cash on A&S balance sheet at 10/1/2018 54.1 (0.5 ) 53.6 Receivables 129.7 (0.8 ) 128.9 Inventory 89.1 (2.1 ) 87.0 Prepaids and other current assets 6.9 (0.2 ) 6.7 Property, plant and equipment 178.3 (1.0 ) 177.3 Intangibles 1,454.0 — 1,454.0 Other non-current assets 7.9 (0.4 ) 7.5 Accounts payable (98.9 ) 0.8 (98.1 ) Accrued payroll (15.2 ) 0.5 (14.7 ) Accrued expenses and other current liabilities (33.7 ) 0.1 (33.6 ) Pension liability and other post employment benefits (12.0 ) — (12.0 ) Deferred tax liability (355.7 ) (11.7 ) (367.4 ) Other long term liability (2.6 ) (0.3 ) (2.9 ) Senior unsecured notes assumed (400.0 ) — (400.0 ) Total identifiable net assets assumed 1,001.9 (15.6 ) 986.3 Goodwill $ 1,460.2 $ 29.1 $ 1,489.3
Schedule of Intangible Assets Acquired	The excess of the purchase price over the fair value of the net assets acquired was recorded as goodwill, which is not deductible for income tax purposes. The goodwill in this acquisition is attributable to the Company’s expectation to achieve synergies, such as facility consolidations, global procurement efficiencies, the ability to cross-sell product, and the ability to penetrate certain geographic areas. Intangible assets acquired consist of: Customer relationships $ 1,025.0 Trade names and trademarks 209.0 Technology 204.0 In-process research and development ("IPR&D") 16.0 Total intangible assets $ 1,454.0
Schedule of Unaudited Pro Forma Results of Operation	The following table sets forth the unaudited pro forma results of operations of the Company for the quarter and year to date period ended June 30, 2018, as if the Company had acquired the A&S Business on January 1, 2018. The pro forma information contains the actual operating results of the Company and the A&S Business, adjusted to include the pro forma impact of (i) additional depreciation expense as a result of estimated depreciation based on the fair value of fixed assets; (ii) additional expense as a result of the estimated amortization of identifiable intangible assets and (iii) additional interest expense for borrowings associated with the A&S Acquisition. These pro forma amounts do not purport to be indicative of the results that would have actually been obtained if the acquisition occurred at the beginning of the period or that may be obtained in the future. Pro forma (unaudited) Quarter Ended June 30, Year To Date Ended June 30, 2018 2018 Total revenues $ 493.5 $ 984.5 Net income 37.1 63.3 Basic earnings per share $ 0.58 $ 0.99 Diluted earnings per share $ 0.58 $ 0.98

Lease Accounting (Tables)

Lease Accounting (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Quantitative Information Regarding Lease Cost	Year To Date Ended June 30, 2019 Lease cost (1) Operating lease cost 8.4 Short-term lease cost 0.2 Total lease cost $ 8.6 (1) Finance lease costs and variable lease costs are immaterial to the Company. The Company does not have lease or sub lease income.
Quantitative Information Regarding Maturities of Lease Liabilities	Maturities of Lease Liabilities Operating Leases Finance Leases 2019 $ 8.2 $ 0.1 2020 13.5 0.2 2021 8.2 0.2 2022 6.4 0.1 2023 4.4 — After 2023 4.9 — Total lease payments 45.6 0.6 Less interest (3.6 ) (0.1 ) Present value of lease liabilities $ 42.0 $ 0.5
Quantitative Information Regarding Other Information	Other Information: Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from finance leases $ 0.0 Operating cash flows from operating leases $ 8.5 Financing cash flows from finance leases $ 0.0 Weighted average remaining lease term - finance leases (in years) 3.30 Weighted average remaining lease term - operating leases (in years) 4.26 Average discount rate - finance leases 5.50 % Average discount rate - operating leases 3.46 %
Future Minimum Rent Obligations under Non-Cancelable Operating and Capital Leases	As previously disclosed in our 2018 Annual Report on Form 10-K and under Topic 840, future minimum lease payments for operating leases having initial or remaining noncancelable lease terms in excess of one year were as follows: Year ending December 31: Operating Leases Capital Leases 2019 $ 15.3 $ 0.2 2020 11.2 0.2 2021 7.8 0.2 2022 6.1 0.1 2023 4.4 — After 2023 5.1 — Total lease obligations 49.9 0.7 Less amounts representing interest — (0.1 ) Present value of minimum capital lease obligations $ 49.9 $ 0.6

Revenue Recognition (Tables)

Revenue Recognition (Tables)	6 Months Ended
	Jun. 30, 2019
Revenue From Contract With Customer [Abstract]
Disaggregates Revenue for Each Reportable Segment and Geographic Region	The following table disaggregates our revenue for each reportable segment. The Company believes that disaggregating revenue into these categories achieves the disclosure objective to depict how the nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factors. Quarter Ended Year to Date Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Net Sales: Power Transmission Technologies $ 234.9 $ 237.3 $ 469.8 $ 477.7 Automation & Specialty 233.3 — 482.4 — Inter-segment eliminations (1.7 ) — (2.9 ) — Net sales $ 466.5 $ 237.3 $ 949.3 $ 477.7 Net sales by geographic region based on point of shipment origin are as follows: Net Sales Quarter Ended Year to Date Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 North America (primarily U.S.) $ 269.8 $ 119.0 $ 542.8 $ 244.7 Europe excluding Germany 79.9 42.5 161.7 86.6 Germany 56.8 48.8 119.0 98.2 Asia and other 60.0 27.0 125.8 48.2 Total $ 466.5 $ 237.3 $ 949.3 $ 477.7
Summary of Opening and Closing Balances of Contract Liability and Receivables	The opening and closing balances of the Company’s contract liability and receivables as of the year to date period ended June 30, 2019 are as follows: Deferred Revenue (Current) Accounts Receivable Beginning - January 1, 2019 $ 7.4 $ 259.8 Closing - June 30, 2019 8.1 269.6 Increase/(Decrease) $ 0.7 $ 9.8

Changes in Accumulated Other _2

Changes in Accumulated Other Comprehensive Loss by Component (Tables)	6 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Reconciliation of Changes in Accumulated Other Comprehensive Loss by Component	The following is a reconciliation of changes in accumulated other comprehensive loss by component for the periods presented: Gains and Losses on Cash Flow Hedges Defined Benefit Pension Plans Cumulative Foreign Currency Translation Adjustment Total Accumulated Other Comprehensive Loss by Component, January 1, 2019 $ (12.9 ) $ (0.2 ) $ (58.5 ) $ (71.6 ) Net current-period Other Comprehensive Loss (2.5 ) (0.3 ) (7.6 ) (10.4 ) Accumulated Other Comprehensive Loss by Component, June 30, 2019 $ (15.4 ) $ (0.5 ) $ (66.1 ) $ (82.0 ) Gains and Losses on Cash Flow Hedges Defined Benefit Pension Plans Cumulative Foreign Currency Translation Adjustment Total Accumulated Other Comprehensive Loss by Component, January 1, 2018 $ (0.5 ) $ (3.7 ) $ (45.7 ) $ (49.9 ) Net current-period Other Comprehensive Income Gain/(Loss) 1.1 0.6 (8.5 ) (6.8 ) Reclassification adjustment from loss on partial settlement of pension plan, net of tax — 3.8 — 3.8 Accumulated Other Comprehensive Gain/(Loss) by Component, June 30, 2018 $ 0.6 $ 0.7 $ (54.2 ) $ (52.9 )

Net Income per Share (Tables)

Net Income per Share (Tables)	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Reconciliation of Basic to Diluted Net Income per Share	The following is a reconciliation of basic to diluted net income per share: Quarter Ended Year to Date Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Net income $ 29.0 $ 19.0 $ 64.2 $ 28.0 Shares used in net income per common share - basic 64.3 29.0 64.3 29.1 Incremental shares of unvested restricted common stock 0.2 0.1 0.2 0.1 Shares used in net income per common share - diluted 64.5 29.1 64.5 29.2 Earnings per share: Basic net income $ 0.45 $ 0.66 $ 1.00 $ 0.96 Diluted net income $ 0.45 $ 0.65 $ 1.00 $ 0.96

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Jun. 30, 2019
Inventory Disclosure [Abstract]
Summary of Inventories	Inventories at June 30, 2019 and December 31, 2018 consisted of the following: June 30, 2019 December 31, 2018 Raw materials $ 115.1 $ 103.0 Work in process 26.5 23.5 Finished goods 95.9 104.7 $ 237.5 $ 231.2

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Changes in Goodwill	Changes in goodwill from January 1, 2019 through June 30, 2019 were as follows: Power Transmission Technologies Automation & Specialty Total Net goodwill balance January 1, 2019 $ 410.2 $ 1,252.1 $ 1,662.3 Measurement period adjustment related to acquisition of A&S — 29.1 29.1 Impact of changes in foreign currency (0.4 ) (4.9 ) (5.3 ) Net goodwill balance June 30, 2019 $ 409.8 $ 1,276.3 $ 1,686.1
Other Intangible Assets	Other intangible assets as of June 30, 2019 and December 31, 2018 consisted of the following: June 30, 2019 December 31, 2018 Cost Accumulated Amortization Net Cost Accumulated Amortization Net Other intangible assets Intangible assets not subject to amortization: Tradenames and trademarks $ 261.6 $ — $ 261.6 $ 262.0 $ — $ 262.0 In-process research and development 16.0 — 16.0 16.0 — 16.0 Intangible assets subject to amortization: Customer relationships 1,195.6 113.6 1,082.0 1,196.4 91.0 1,105.4 Product technology and patents 210.1 23.2 186.9 212.9 10.6 202.3 Total intangible assets $ 1,683.3 $ 136.8 $ 1,546.5 $ 1,687.3 $ 101.6 $ 1,585.7

Warranty Costs (Tables)

Warranty Costs (Tables)	6 Months Ended
	Jun. 30, 2019
Guarantees [Abstract]
Changes in Carrying Amount of Accrued Product Warranty Costs	Changes in the carrying amount of accrued product warranty costs for each of the quarters ended June 30, 2019 and 2018 are as follows: June 30, 2019 June 30, 2018 Balance at beginning of period $ 9.4 $ 7.5 Accrued current period warranty expense 2.0 0.5 Payments and adjustments (1.2 ) (1.4 ) Balance at end of period $ 10.2 $ 6.6

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Outstanding Debt Obligations	Outstanding debt obligations at June 30, 2019 and December 31, 2018 were as follows. June 30, 2019 December 31, 2018 Debt: Term loan $ 1,270.0 $ 1,320.0 Notes 400.0 400.0 Mortgages and other 15.2 13.5 Finance leases 0.5 0.5 Total gross debt 1,685.7 1,734.0 Less: debt discount and deferred financing costs (24.0 ) (25.9 ) Total debt, net of deferred financing costs 1,661.7 1,708.1 Less: current portion of long-term debt (19.2 ) (17.2 ) Total long-term debt, net of unaccreted discount $ 1,642.5 $ 1,690.9

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2019
Stockholders Equity Note [Abstract]
Company's Restricted Stock Grants and Stock Options	The following tables set forth the activity of the Company’s restricted stock grants and stock options to date: Shares Weighted- average fair value Shares unvested January 1, 2019 823.6 $ 36.69 Shares granted 402.0 31.12 Shares for which restrictions lapsed (225.3 ) 30.50 Shares unvested June 30, 2019 1,000.3 $ 35.59 Shares Weighted- average fair value Options unvested January 1, 2019 — $ — Options granted 271.7 30.65 Options exercised — — Options outstanding June 30, 2019 271.7 $ 30.65

Restructuring, Asset Impairme_2

Restructuring, Asset Impairment, and Transition Expenses (Tables)	6 Months Ended
	Jun. 30, 2019
Restructuring And Related Activities [Abstract]
Reconciliation of Accrued Restructuring Costs	The following is a reconciliation of the accrued restructuring costs between January 1, 2019 and June 30, 2019. 2017 Altra Plan 2019 Altra Plan Total All Plans Balance at January 1, 2019 $ 2.0 $ — $ 2.0 Restructuring expense incurred 1.0 1.3 2.3 Cash payments (1.5 ) (0.5 ) (2.0 ) Balance at March 31, 2019 1.5 0.8 2.3 Restructuring expense incurred 1.8 1.4 3.2 Cash payments (2.0 ) (0.7 ) (2.7 ) Balance at June 30, 2019 $ 1.3 $ 1.5 $ 2.8 The following is a reconcilation of the accrued restructuring costs between January 1, 2018 and June 30, 2018 . 2015 Altra Plan 2017 Altra Plan 2019 Altra Plan Total All Plans Balance at January 1, 2018 $ 0.8 $ 0.2 $ — $ 1.0 Restructuring expense incurred — 0.9 — 0.9 Cash payments (0.1 ) (0.4 ) — (0.5 ) Balance at March 31, 2018 0.7 0.7 — 1.4 Restructuring expense incurred — 0.6 — 0.6 Cash payments (0.2 ) (0.9 ) — (1.1 ) Balance at June 30, 2018 $ 0.5 $ 0.4 $ — $ 0.9
Reconciliation of Restructuring Expense by Segment	The following is a reconciliation of restructuring expense by segment for the year to date period ended June 30, 2019. 2017 Altra Plan 2019 Altra Plan Total All Plans Power Transmission Technologies $ 2.8 $ 0.1 $ 2.9 Automation & Specialty — 2.6 2.6 Balance at June 30, 2019 $ 2.8 $ 2.7 $ 5.5

Segments, Concentrations and _2

Segments, Concentrations and Geographic Information (Tables)	6 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Segment Financial Information and Reconciliation of Segments Revenue to Unaudited Condensed Consolidated Revenue	Segment financial information and a reconciliation of segment results to unaudited condensed consolidated results are as follows: Quarters Ended Year to Date Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Net Sales: Power Transmission Technologies $ 234.9 $ 237.3 $ 469.8 $ 477.7 Automation & Specialty 233.3 — 482.4 — Inter-segment eliminations (1.7 ) — (2.9 ) — Net sales $ 466.5 $ 237.3 $ 949.3 $ 477.7 Income from operations: Segment earnings: Power Transmission Technologies $ 31.9 $ 33.2 $ 60.8 $ 61.5 Automation & Specialty 31.8 — 72.4 — Corporate expenses (1) (3.4 ) (4.6 ) (4.2 ) (12.2 ) Restructuring costs (3.2 ) (0.6 ) (5.5 ) (1.5 ) Income from operations $ 57.1 $ 28.0 $ 123.5 $ 47.8 Other non-operating (income) expense: Loss on settlement of pension plan — — — 5.1 Net interest expense 18.6 2.1 38.4 3.9 Other non-operating (income), net 0.4 (0.3 ) 1.5 (0.4 ) Total non-operating (income) expense $ 19.0 $ 1.8 $ 39.9 $ 8.6 Income before income taxes 38.1 26.2 83.6 39.2 Provision for income taxes 9.1 7.2 19.4 11.2 Net income $ 29.0 $ 19.0 $ 64.2 $ 28.0 (1) Certain expenses are maintained at the corporate level and not allocated to the segments. These include various administrative expenses related to the Company’s corporate headquarters, depreciation on capitalized software costs, non-capitalizable software implementation costs and acquisition related expenses.
Reconciliation of Segment Assets to Consolidated Assets	Selected information by segment (continued) Quarter Ended Year to Date Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Depreciation and amortization: Power Transmission Technologies $ 8.3 $ 8.4 $ 16.7 $ 17.0 Automation & Specialty 23.2 — 46.2 — Corporate 0.7 0.9 1.4 1.7 Total depreciation and amortization $ 32.2 $ 9.3 $ 64.3 $ 18.7 June 30, 2019 June 30, 2018 Total assets: Power Transmission Technologies $ 1,089.2 $ 884.0 Automation & Specialty 3,170.3 — Corporate 98.3 22.6 Total assets $ 4,357.8 $ 906.6 (2) Corporate assets are primarily cash and cash equivalents, tax related asset accounts, certain capitalized software costs, and property, plant and equipment.
Net Sales to Third Parties by Geographic Region	Net sales to third parties by geographic region are as follows: Net Sales Quarter Ended Year to Date Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 North America (primarily U.S.) $ 269.8 $ 119.0 $ 542.8 $ 244.7 Europe excluding Germany 79.9 42.5 161.7 86.6 Germany 56.8 48.8 119.0 98.2 Asia and other 60.0 27.0 125.8 48.2 Total $ 466.5 $ 237.3 $ 949.3 $ 477.7

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Summary of Outstanding Swaps	The following table summarizes outstanding swaps that the Company has recorded at June 30, 2019. Initial US$ Date Derivative Notional Entered Financial Amount Fixed Rate Floating Leg Fixed Rate Floating Leg Settlement Effective into Instrument (millions) (swap counterparty) (swap counterparty) (Company) (Company) Dates Period of Swap 12/10/2018 Cross currency interest rate swap $ 240.0 4.8255% N/A 2.315% N/A Quarterly on the last day of each December, March, June, and September 12/10/2018 - 9/29/2023 12/10/2018 Cross currency interest rate swap $ 192.0 4.8255% N/A 2.235% N/A Quarterly on the last day of each December, March, June, and September 12/10/2018 - 9/29/2023 12/10/2018 Cross currency interest rate swap $ 108.0 4.8255% N/A 2.190% N/A Quarterly on the last day of each December, March, June, and September 12/10/2018 - 9/29/2023 12/10/2018 Cross currency interest rate swap $ 60.0 4.8255% N/A 2.290% N/A Quarterly on the last day of each December, March, June, and September 12/10/2018 - 9/29/2023 12/4/2018 Interest rate swap $ 600.0 4.8255% Variable rate 1- month USD LIBOR plus 2% N/A 1 Month USD- LIBOR- BBA plus 2% Monthly on the last business day of each month commencing with December 31, 2018 in accordance with Modified Following Business Day Convention 12/4/2018 - 9/29/2023 1/31/2017 Interest rate swap $ 50.0 N/A Variable rate 1- month USD LIBOR 1.625% USD N/A Monthly on the last banking day of each month commencing February 28, 2017 1/31/2017 - 1/31/2020
Summary of Fair Value Level 2 Inputs of Company's Derivatives	The following table summarizes the location and fair value, using Level 2 inputs (see Note 7 for a description of the fair value levels), of the Company's derivatives designated and not designated as hedging instruments in the unaudited condensed consolidated balance sheets (in millions). Balance Sheet Location June 30, 2019 December 31, 2018 Designated as hedging instruments: Cross currency swap agreements Other long-term (assets)/liabilities $ (2.9 ) $ 8.4 Interest rate swap agreement Other long-term (assets) (0.1 ) (0.5 ) Interest rate swap agreement Other long-term liabilities 21.2 7.9 $ 18.2 $ 15.8

Organization and Nature of Op_2

Organization and Nature of Operations - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2019country
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Number of countries in which the company has production facilities	17

Recent Accounting Standards - A

Recent Accounting Standards - Additional Information (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease, right of use asset	$ 40.4
Operating lease liability	$ 42
ASU 2016-02
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease, right of use asset		$ 46.7
Operating lease liability		$ 48.2

Acquisition - Additional Inform

Acquisition - Additional Information (Detail) $ in Millions	Oct. 01, 2018Company	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)
Business Acquisition [Line Items]
Amortization of intangible assets		$ 17.6	$ 2.4	$ 35.4	$ 4.9
A&S Business [Member]
Business Acquisition [Line Items]
Business combination, number of operating companies in transaction | Company	4
Business combination, measurement period adjustments		2.9		29.1
Business combination, net sales		233.3		482.4
Business combination, net income		21.1		53.2
Amortization of intangible assets		$ 15.3		$ 30.8
A&S Business [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Amortization period				20 years
A&S Business [Member] | Technology [Member] | Minimum [Member]
Business Acquisition [Line Items]
Amortization period				7 years
A&S Business [Member] | Technology [Member] | Maximum [Member]
Business Acquisition [Line Items]
Amortization period				10 years

Acquisition - Schedule of Preli

Acquisition - Schedule of Preliminary Purchase Price Allocation (Detail) - USD ($) $ in Millions	Oct. 01, 2018	Jun. 30, 2019	Dec. 31, 2018
Consideration transferred:
A&S acquisition purchase price adjustment		$ 13.5
Recognized identifiable assets acquired and liabilities assumed:
Goodwill		1,686.1	$ 1,662.3
A&S Business [Member]
Consideration transferred:
Total cash consideration		1,003.4
Total equity consideration		1,458.7
A&S acquisition purchase price adjustment		13.5
Fair value of consideration transferred		2,475.6
Recognized identifiable assets acquired and liabilities assumed:
Less: cash on A&S balance sheet at 10/1/2018		53.6
Receivables		128.9
Inventory		87
Prepaids and other current assets		6.7
Property, plant and equipment		177.3
Intangibles	$ 1,454	1,454
Other non-current assets		7.5
Accounts payable		(98.1)
Accrued payroll		(14.7)
Accrued expenses and other current liabilities		(33.6)
Pension liability and other post employment benefits		(12)
Deferred tax liability		(367.4)
Other long term liability		(2.9)
Senior unsecured notes assumed		(400)
Total identifiable net assets assumed		986.3
Goodwill		1,489.3
A&S Business [Member] | At Acquisition Date [Member]
Consideration transferred:
Total cash consideration	1,003.4
Total equity consideration	1,458.7
Fair value of consideration transferred	2,462.1
Recognized identifiable assets acquired and liabilities assumed:
Less: cash on A&S balance sheet at 10/1/2018	54.1
Receivables	129.7
Inventory	89.1
Prepaids and other current assets	6.9
Property, plant and equipment	178.3
Intangibles	1,454
Other non-current assets	7.9
Accounts payable	(98.9)
Accrued payroll	(15.2)
Accrued expenses and other current liabilities	(33.7)
Pension liability and other post employment benefits	(12)
Deferred tax liability	(355.7)
Other long term liability	(2.6)
Senior unsecured notes assumed	(400)
Total identifiable net assets assumed	1,001.9
Goodwill	$ 1,460.2
A&S Business [Member] | Measurement Period Adjustments [Member]
Consideration transferred:
A&S acquisition purchase price adjustment		13.5
Fair value of consideration transferred		13.5
Recognized identifiable assets acquired and liabilities assumed:
Less: cash on A&S balance sheet at 10/1/2018		(0.5)
Receivables		(0.8)
Inventory		(2.1)
Prepaids and other current assets		(0.2)
Property, plant and equipment		(1)
Other non-current assets		(0.4)
Accounts payable		0.8
Accrued payroll		0.5
Accrued expenses and other current liabilities		0.1
Deferred tax liability		(11.7)
Other long term liability		(0.3)
Total identifiable net assets assumed		(15.6)
Goodwill		$ 29.1

Acquisition - Schedule of Intan

Acquisition - Schedule of Intangible Assets Acquired (Detail) - A&S Business [Member] - USD ($) $ in Millions	Jun. 30, 2019	Oct. 01, 2018
Intangible assets acquired consist of:
Customer relationships		$ 1,025
Trade names and trademarks		209
Technology		204
In-process research and development ("IPR&D")		16
Total intangible assets	$ 1,454	$ 1,454

Acquisition - Schedule of Unaud

Acquisition - Schedule of Unaudited Pro Forma Results of Operations (Detail) - A&S Business [Member] - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2019
Business Acquisition [Line Items]
Total revenues	$ 493.5	$ 984.5
Net income	$ 37.1	$ 63.3
Basic earnings per share	$ 0.58	$ 0.99
Diluted earnings per share	$ 0.58	$ 0.98

Lease Accounting - Additional I

Lease Accounting - Additional Information (Detail) $ in Millions	Jun. 30, 2019USD ($)
Leases [Abstract]
Right-of-use (“ROU”) assets for operating and finance leases	$ 40.9
Lease liabilities for operating and finance leases	$ 42.5

Lease Accounting - Quantitative

Lease Accounting - Quantitative Information Regarding Lease Cost (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)
Lease cost:
Operating lease cost	$ 8.4
Short-term lease cost	0.2
Total lease cost	$ 8.6

Lease Accounting - Quantitati_2

Lease Accounting - Quantitative Information Regarding Lease Cost (Parenthetical) (Detail)	6 Months Ended
	Jun. 30, 2019USD ($)
Leases [Abstract]
Lease or sublease income	$ 0

Lease Accounting - Quantitati_3

Lease Accounting - Quantitative Information Regarding Maturities of Lease Liabilities (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Maturities of Lease Liabilities, Operating Leases
2019, Operating Leases	$ 8.2
2020, Operating Leases	13.5
2021, Operating Leases	8.2
2022, Operating Leases	6.4
2023, Operating Leases	4.4
After 2023, Operating Leases	4.9
Total lease payments, Operating Leases	45.6
Less interest, Operating Leases	(3.6)
Present value of lease liabilities, Operating Leases	42
Maturities of Lease Liabilities, Finance Leases
2019, Finance Leases	0.1
2020, Finance Leases	0.2
2021, Finance Leases	0.2
2022, Finance Leases	0.1
Total lease payments, Finance Leases	0.6
Less interest, Finance Leases	(0.1)
Present value of lease liabilities, Finance Leases	$ 0.5	$ 0.5

Lease Accounting - Quantitati_4

Lease Accounting - Quantitative Information Regarding Other Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from finance leases	$ 0
Operating cash flows from operating leases	8.5
Financing cash flows from finance leases	$ 0
Weighted average remaining lease term - finance leases (in years)	3 years 3 months 18 days
Weighted average remaining lease term - operating leases (in years)	4 years 3 months 3 days
Average discount rate - finance leases	5.50%
Average discount rate - operating leases	3.46%

Lease Accounting - Future Minim

Lease Accounting - Future Minimum Rent Obligations under Non-Cancelable Operating and Capital Leases (Detail) $ in Millions	Dec. 31, 2018USD ($)
Operating Leases
2019	$ 15.3
2020	11.2
2021	7.8
2022	6.1
2023	4.4
After 2023	5.1
Total lease obligations	49.9
Capital Leases
2019	0.2
2020	0.2
2021	0.2
2022	0.1
Total lease obligations	0.7
Less amounts representing interest	(0.1)
Present value of minimum capital lease obligations	$ 0.6

Revenue Recognition - Additiona

Revenue Recognition - Additional Information (Detail) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2019USD ($)channel
Revenue From Contract With Customer [Abstract]
Number of distribution channels | channel		3
Revenue recognized | $	$ 1.6	$ 3.7

Revenue Recognition - Disaggreg

Revenue Recognition - Disaggregates Revenue for Each Reportable Segment and Geographic Region (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation Of Revenue [Line Items]
Net sales	$ 466.5	$ 237.3	$ 949.3	$ 477.7
North America (primarily U.S.) [Member]
Disaggregation Of Revenue [Line Items]
Net sales	269.8	119	542.8	244.7
Europe Excluding Germany [Member]
Disaggregation Of Revenue [Line Items]
Net sales	79.9	42.5	161.7	86.6
Germany [Member]
Disaggregation Of Revenue [Line Items]
Net sales	56.8	48.8	119	98.2
Asia And Other [Member]
Disaggregation Of Revenue [Line Items]
Net sales	60	27	125.8	48.2
Operating Segments [Member] | Power Transmission Technologies [Member]
Disaggregation Of Revenue [Line Items]
Net sales	234.9	$ 237.3	469.8	$ 477.7
Operating Segments [Member] | Automation & Specialty [Member]
Disaggregation Of Revenue [Line Items]
Net sales	233.3		482.4
Intersegment Eliminations [Member]
Disaggregation Of Revenue [Line Items]
Net sales	$ (1.7)		$ (2.9)

Revenue Recognition - Summary o

Revenue Recognition - Summary of Opening and Closing Balances of Contract Liability and Receivables (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)
Disaggregation Of Revenue [Line Items]
Accounts Receivable, Beginning Balance	$ 259.8
Accounts Receivable, Closing Balance	269.6
ASU 2014-09 [Member]
Disaggregation Of Revenue [Line Items]
Deferred Revenue (Current), Beginning Balance	7.4
Deferred Revenue (Current), Closing Balance	8.1
Deferred Revenue (Current), Increase/(Decrease)	0.7
Accounts Receivable, Beginning Balance	259.8
Accounts Receivable, Closing Balance	269.6
Accounts Receivable, Increase/(Decrease)	$ 9.8

Fair Value of Financial Instr_2

Fair Value of Financial Instruments - Additional Information (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Notes [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt	$ 400	$ 400
Estimated fair value	420
Altra Credit Agreement [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt	$ 1,270	$ 1,320

Changes in Accumulated Other _3

Changes in Accumulated Other Comprehensive Loss by Component - Reconciliation of Changes in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Gain/(Loss) by Component, beginning balance	$ (71.6)
Beginning balance	1,848.2	$ 396.7
Net current-period Other Comprehensive Income Gain/(Loss)	(10.4)	(6.8)
Reclassification adjustment from loss on partial settlement of pension plan, net of tax		3.8
Accumulated Other Comprehensive Gain/(Loss) by Component, ending balance	(82)
Ending balance	1,884.4	412.9
Gains and Losses on Cash Flow Hedges [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Gain/(Loss) by Component, beginning balance	(12.9)	(0.5)
Net current-period Other Comprehensive Income Gain/(Loss)	(2.5)	1.1
Reclassification adjustment from loss on partial settlement of pension plan, net of tax		0
Accumulated Other Comprehensive Gain/(Loss) by Component, ending balance	(15.4)	0.6
Defined Benefit Pension Plans [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Gain/(Loss) by Component, beginning balance	(0.2)	(3.7)
Net current-period Other Comprehensive Income Gain/(Loss)	(0.3)	0.6
Reclassification adjustment from loss on partial settlement of pension plan, net of tax		3.8
Accumulated Other Comprehensive Gain/(Loss) by Component, ending balance	(0.5)	0.7
Cumulative Foreign Currency Translation Adjustment [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated Other Comprehensive Gain/(Loss) by Component, beginning balance	(58.5)	(45.7)
Net current-period Other Comprehensive Income Gain/(Loss)	(7.6)	(8.5)
Reclassification adjustment from loss on partial settlement of pension plan, net of tax		0
Accumulated Other Comprehensive Gain/(Loss) by Component, ending balance	(66.1)	(54.2)
Accumulated Other Comprehensive Income (Loss) [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(71.6)	(49.9)
Ending balance	$ (82)	$ (52.9)

Net Income per Share - Reconcil

Net Income per Share - Reconciliation of Basic to Diluted Net Income per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income	$ 29	$ 19	$ 64.2	$ 28
Shares used in net income per common share - basic (in shares)	64.3	29	64.3	29.1
Incremental shares of unvested restricted common stock (in shares)	0.2	0.1	0.2	0.1
Shares used in net income per common share - diluted (in shares)	64.5	29.1	64.5	29.2
Earnings per share:
Basic net income	$ 0.45	$ 0.66	$ 1	$ 0.96
Diluted net income	$ 0.45	$ 0.65	$ 1	$ 0.96

Net Income per Share - Addition

Net Income per Share - Additional Information (Detail) - shares shares in Millions	Oct. 01, 2018	Jun. 30, 2019	Dec. 31, 2018
Class Of Stock [Line Items]
Common stock, shares issued (in shares)	64.2	64.3	64.2
Common stock, shares outstanding (in shares)	64.2	64.3	64.2
Fortive [Member] | Common Stock [Member]
Class Of Stock [Line Items]
Stock issued	35

Inventories - Summary of Invent

Inventories - Summary of Inventories (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Raw materials	$ 115.1	$ 103
Work in process	26.5	23.5
Finished goods	95.9	104.7
Inventories, net	$ 237.5	$ 231.2

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Changes in Goodwill (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Goodwill [Roll Forward]
Net goodwill, beginning balance		$ 1,662.3
Impact of changes in foreign currency		(5.3)
Net goodwill, ending balance	$ 1,686.1	1,686.1
A&S Business [Member]
Goodwill [Roll Forward]
Net goodwill, ending balance	1,489.3	1,489.3
Measurement period adjustment related to acquisition of A&S	2.9	29.1
Power Transmission Technologies [Member]
Goodwill [Roll Forward]
Net goodwill, beginning balance		410.2
Impact of changes in foreign currency		(0.4)
Net goodwill, ending balance	409.8	409.8
Automation & Specialty [Member]
Goodwill [Roll Forward]
Net goodwill, beginning balance		1,252.1
Impact of changes in foreign currency		(4.9)
Net goodwill, ending balance	$ 1,276.3	1,276.3
Automation & Specialty [Member] | A&S Business [Member]
Goodwill [Roll Forward]
Measurement period adjustment related to acquisition of A&S		$ 29.1

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Other Intangible Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Total intangible assets, accumulated amortization	$ 136.8	$ 101.6
Total intangible assets, cost	1,683.3	1,687.3
Total intangible assets, net	1,546.5	1,585.7
Customer Relationships [Member]
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, cost	1,195.6	1,196.4
Total intangible assets, accumulated amortization	113.6	91
Intangible assets subject to amortization, net	1,082	1,105.4
Product Technology and Patents [Member]
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, cost	210.1	212.9
Total intangible assets, accumulated amortization	23.2	10.6
Intangible assets subject to amortization, net	186.9	202.3
Tradenames and Trademarks [Member]
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets not subject to amortization, cost	261.6	262
In-process Research and Development [Member]
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets not subject to amortization, cost	$ 16	$ 16

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense	$ 17.6	$ 2.4	$ 35.4	$ 4.9
Estimated amortization expense, remainder of 2019	35.4		35.4
Estimated amortization expense, year 2020	70.7		70.7
Estimated amortization expense, year 2021	70.7		70.7
Estimated amortization expense, year 2022	70.7		70.7
Estimated amortization expense, year 2023	70.7		70.7
Estimated amortization expense, thereafter	$ 950.7		$ 950.7

Warranty Costs - Additional Inf

Warranty Costs - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2019
Minimum [Member]
Guarantor Obligations [Line Items]
Product warranty period	3 months
Maximum [Member]
Guarantor Obligations [Line Items]
Product warranty period	2 years

Warranty Costs - Changes in Car

Warranty Costs - Changes in Carrying Amount of Accrued Product Warranty Costs (Detail) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward]
Balance at beginning of period	$ 9.4	$ 7.5
Accrued current period warranty expense	2	0.5
Payments and adjustments	(1.2)	(1.4)
Balance at end of period	$ 10.2	$ 6.6

Debt - Outstanding Debt Obligat

Debt - Outstanding Debt Obligations (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Finance leases	$ 0.5	$ 0.5
Total gross debt	1,685.7	1,734
Less: debt discount and deferred financing costs	(24)	(25.9)
Total debt, net of deferred financing costs	1,661.7	1,708.1
Less: current portion of long-term debt	(19.2)	(17.2)
Total long-term debt, net of unaccreted discount	1,642.5	1,690.9
Term Loan [Member]
Debt Instrument [Line Items]
Debt	1,270	1,320
Notes [Member]
Debt Instrument [Line Items]
Debt	400	400
Mortgages and Other [Member]
Debt Instrument [Line Items]
Debt	$ 15.2	$ 13.5

Debt - Additional Information (

Debt - Additional Information (Detail) - USD ($)	Oct. 01, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Debt Instrument [Line Items]
Amortization of deferred financing costs		$ 2,300,000	$ 300,000
Finance lease obligations		500,000		$ 500,000
Mortgages and Other Agreements [Member]
Debt Instrument [Line Items]
Outstanding debt		$ 2,400,000
Description about maturity date of debt instrument		The debt has interest rates that range from 1.79% to 2.5%, with various quarterly and monthly installments through 2028.
Minimum [Member] | Mortgages and Other Agreements [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate percentage		1.79%
Maximum [Member] | Mortgages and Other Agreements [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate percentage		2.50%
2015 Revolving credit facility [Member]
Debt Instrument [Line Items]
Maximum amount available	$ 425,000,000
Line of Credit [Member] | Mortgages and Other Agreements [Member] | China [Member]
Debt Instrument [Line Items]
Debt instrument, aggregate principal amount		$ 7,500,000
Debt instrument, term		1 year
6.125% Senior Notes Due 2026 [Member] | Newco [Member]
Debt Instrument [Line Items]
Debt instrument, aggregate principal amount	$ 400,000,000
Debt instrument, interest rate percentage	6.125%
Debt instrument, maturity date	Oct. 1, 2026
Debt instrument, interest payment terms		Interest on the Notes accrues from October 1, 2018, and the next interest payment date on the Notes will be due July 1, 2019. The Notes may be redeemed at the option of the issuer on or after October 1, 2023.
Debt instrument, first interest payment date	Jul. 1, 2019
Debt instrument, redemption, description		The Notes may be redeemed at the option of the issuer on or after October 1, 2023
Debt instrument, redemption period, start date	Oct. 1, 2023
Altra Credit Agreement [Member]
Debt Instrument [Line Items]
Amortization of deferred financing costs		$ 29,900,000
Outstanding debt		1,270,000,000
Letters of credit outstanding		$ 4,400,000		$ 4,200,000
Altra Credit Agreement [Member] | Minimum [Member]
Debt Instrument [Line Items]
Credit facility, unused capacity, commitment fee percentage	0.25%
Altra Credit Agreement [Member] | Maximum [Member]
Debt Instrument [Line Items]
Credit facility, unused capacity, commitment fee percentage	0.375%
Altra Credit Agreement [Member] | Altra Term Loan Facility [Member]
Debt Instrument [Line Items]
Debt instrument, term	7 years
Maximum amount available	$ 1,340,000,000
Debt instrument, description of variable rate basis		Borrowings under the Altra Term Loan Facility will bear interest at a per annum rate equal to a “Eurocurrency Rate” plus 2.00%, in the case of Eurocurrency Rate borrowings, or equal to a “Base Rate” plus 1.00%, in the case of Base Rate borrowings.
Line of credit facility, interest rate during period		4.40%
Altra Credit Agreement [Member] | Altra Term Loan Facility [Member] | Eurocurrency Rate [Member]
Debt Instrument [Line Items]
Applicable margins for loans	2.00%
Altra Credit Agreement [Member] | Altra Term Loan Facility [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Applicable margins for loans	1.00%
Altra Credit Agreement [Member] | Altra Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, term	5 years
Maximum amount available	$ 300,000,000
Debt instrument, description of variable rate basis		Borrowings under the Altra Revolving Credit Facility will initially bear interest at a per annum rate equal to a Eurocurrency Rate plus 2.00%, in the case of Eurocurrency Rate borrowings, or equal to a Base Rate plus 1.00%, in the case of Base Rate borrowings
Line of credit facility, interest rate during period		4.40%
Amount available under credit facility		$ 295,600,000
Altra Credit Agreement [Member] | Altra Revolving Credit Facility [Member] | Eurocurrency Rate [Member]
Debt Instrument [Line Items]
Applicable margins for loans	2.00%
Altra Credit Agreement [Member] | Altra Revolving Credit Facility [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Applicable margins for loans	1.00%

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) - USD ($)	Oct. 19, 2016	Oct. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Oct. 01, 2018	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares)			120,000,000		120,000,000		120,000,000	120,000,000	90,000,000
Common stock, shares issued (in shares)			64,300,000		64,300,000		64,200,000	64,200,000
Common stock, shares outstanding (in shares)			64,300,000		64,300,000		64,200,000	64,200,000
Preferred Stock, shares authorized (in shares)			10,000,000		10,000,000
Preferred Stock, shares issued (in shares)			0		0		0
Preferred Stock, shares outstanding (in shares)			0		0		0
Compensation expense			$ 3,500,000	$ 1,400,000	$ 7,000,000	$ 2,700,000
Unrecognized compensation cost			26,500,000		$ 26,500,000
Weighted average remaining period					3 years
Stock repurchase program, expiration period	Dec. 31, 2019
Repurchased shares of common stock					0	0
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount	$ 30,000,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of stock awards			$ 34,700,000		$ 34,700,000
Restricted Stock [Member] | Automation and Specialty [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock issued		536,030
Aggregate fair value of awards		$ 21,000,000
Fair value attributed to preacquisition savings		$ 3,100,000
2014 Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock available for delivery pursuant to the grant of awards (in shares)			1,700,000		1,700,000
2014 Plan [Member] | Restricted Shares and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares for vesting period					5 years

Stockholders' Equity - Company'

Stockholders' Equity - Company's Restricted Stock Grants and Stock Options (Detail)	6 Months Ended
	Jun. 30, 2019$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Options granted | shares	271,700,000
Options unvested, ending balance | shares	271,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-average grant date fair value, Options granted | $ / shares	$ 30.65
Weighted-average grant date fair value, Options unvested, ending balance | $ / shares	$ 30.65
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Shares unvested, beginning balance | shares	823,600,000
Shares granted | shares	402,000,000
Shares for which restrictions lapsed | shares	(225,300,000)
Shares unvested, ending balance | shares	1,000,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-average grant date fair value, beginning balance | $ / shares	$ 36.69
Weighted-average grant date fair value, shares granted | $ / shares	31.12
Weighted-average grant date fair value, shares for which restrictions lapsed | $ / shares	30.50
Weighted-average grant date fair value, ending balance | $ / shares	$ 35.59

Restructuring, Asset Impairme_3

Restructuring, Asset Impairment, and Transition Expenses - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Restructuring Cost And Reserve [Line Items]
Restructuring costs	$ 3.2	$ 2.3	$ 0.6	$ 0.9	$ 5.5	$ 1.5
2017 Altra Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs	1.8	1	$ 0.6	$ 0.9	2.8
2017 Altra Plan [Member] | Minimum [Member]
Restructuring Cost And Reserve [Line Items]
Expected additional restructuring cost remaining	1				1
2017 Altra Plan [Member] | Maximum [Member]
Restructuring Cost And Reserve [Line Items]
Expected additional restructuring cost remaining	3				3
2019 Altra Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs	1.4	$ 1.3			$ 2.7
Expected period to incur restructuring expense					4 years
2019 Altra Plan [Member] | Minimum [Member]
Restructuring Cost And Reserve [Line Items]
Expected additional restructuring cost remaining	15				$ 15
2019 Altra Plan [Member] | Maximum [Member]
Restructuring Cost And Reserve [Line Items]
Expected additional restructuring cost remaining	25				25
Severance [Member] | 2017 Altra Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs	0.7				1.2
Severance [Member] | 2019 Altra Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs	1.2				2.3
Consolidation costs [Member] | 2017 Altra Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs	0.3				0.6
Employee Relocation [Member] | 2017 Altra Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs	0.1				0.1
Employee Relocation [Member] | 2019 Altra Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs					0.1
Other Restructuring Costs [Member] | 2017 Altra Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs	0.7				0.9
Other Restructuring Costs [Member] | 2019 Altra Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs	$ 0.2				$ 0.3

Restructuring, Asset Impairme_4

Restructuring, Asset Impairment, and Transition Expenses - Reconciliation of Accrued Restructuring Costs (Detail) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 2.3	$ 2	$ 1.4	$ 1	$ 2	$ 1
Restructuring expense incurred	3.2	2.3	0.6	0.9	5.5	1.5
Cash payments	(2.7)	(2)	(1.1)	(0.5)
Ending Balance	2.8	2.3	0.9	1.4	2.8	0.9
2017 Altra Plan [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	1.5	2	0.7	0.2	2	0.2
Restructuring expense incurred	1.8	1	0.6	0.9	2.8
Cash payments	(2)	(1.5)	(0.9)	(0.4)
Ending Balance	1.3	1.5	0.4	0.7	1.3	0.4
2019 Altra Plan [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	0.8
Restructuring expense incurred	1.4	1.3			2.7
Cash payments	(0.7)	(0.5)
Ending Balance	$ 1.5	$ 0.8			$ 1.5
2015 Altra Plan [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance			0.7	0.8		0.8
Cash payments			(0.2)	(0.1)
Ending Balance			$ 0.5	$ 0.7		$ 0.5

Restructuring, Asset Impairme_5

Restructuring, Asset Impairment, and Transition Expenses - Summary of Reconciliation of Restructuring Expense by Segment (Detail) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Restructuring Cost And Reserve [Line Items]
Restructuring expense	$ 3.2	$ 2.3	$ 0.6	$ 0.9	$ 5.5	$ 1.5
2017 Altra Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense	1.8	1	0.6	$ 0.9	2.8
2019 Altra Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense	1.4	$ 1.3			2.7
Operating Segments [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense	$ 3.2		$ 0.6		5.5	$ 1.5
Operating Segments [Member] | Power Transmission Technologies [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense					2.9
Operating Segments [Member] | Automation & Specialty [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense					2.6
Operating Segments [Member] | 2017 Altra Plan [Member] | Power Transmission Technologies [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense					2.8
Operating Segments [Member] | 2019 Altra Plan [Member] | Power Transmission Technologies [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense					0.1
Operating Segments [Member] | 2019 Altra Plan [Member] | Automation & Specialty [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring expense					$ 2.6

Segments, Concentrations and _3

Segments, Concentrations and Geographic Information - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2019segment
Segment Reporting [Abstract]
Number of reporting segments	2

Segments, Concentrations and _4

Segments, Concentrations and Geographic Information - Segment Financial Information and Reconciliation of Segments Revenue to Unaudited Condensed Consolidated Revenue (Detail) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales		$ 466.5		$ 237.3		$ 949.3	$ 477.7
Income from operations		57.1		28		123.5	47.8
Restructuring costs		(3.2)	$ (2.3)	(0.6)	$ (0.9)	(5.5)	(1.5)
Loss on settlement of pension plan							5.1
Net interest expense		18.6		2.1		38.4	3.9
Other non-operating (income), net		0.4		(0.3)		1.5	(0.4)
Total other non-operating (income) expense, net		19		1.8		39.9	8.6
Income before income taxes		38.1		26.2		83.6	39.2
Provision for income taxes		9.1		7.2		19.4	11.2
Net income		29		19		64.2	28
Operating Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Restructuring costs		(3.2)		(0.6)		(5.5)	(1.5)
Operating Segments [Member] | Power Transmission Technologies [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales		234.9		237.3		469.8	477.7
Income from operations		31.9		33.2		60.8	61.5
Restructuring costs						(2.9)
Operating Segments [Member] | Automation & Specialty [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales		233.3				482.4
Income from operations		31.8				72.4
Restructuring costs						(2.6)
Intersegment Eliminations [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales		(1.7)				(2.9)
Corporate [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Income from operations	[1]	$ (3.4)		$ (4.6)		$ (4.2)	$ (12.2)
[1]	Certain expenses are maintained at the corporate level and not allocated to the segments. These include various administrative expenses related to the Company’s corporate headquarters, depreciation on capitalized software costs, non-capitalizable software implementation costs and acquisition related expenses.

Segments, Concentrations and _5

Segments, Concentrations and Geographic Information - Reconciliation of Segment Assets to Consolidated Assets (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Total depreciation and amortization		$ 32.2	$ 9.3	$ 64.3	$ 18.7
Total assets		4,357.8	906.6	4,357.8	906.6	$ 4,337.2
Corporate [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total depreciation and amortization		0.7	0.9	1.4	1.7
Total assets	[1]	98.3	22.6	98.3	22.6
Power Transmission Technologies [Member] | Operating Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total depreciation and amortization		8.3	8.4	16.7	17
Total assets		1,089.2	$ 884	1,089.2	$ 884
Automation & Specialty [Member] | Operating Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total depreciation and amortization		23.2		46.2
Total assets		$ 3,170.3		$ 3,170.3
[1]	Corporate assets are primarily cash and cash equivalents, tax related asset accounts, certain capitalized software costs, and property, plant and equipment.

Segments, Concentrations and _6

Segments, Concentrations and Geographic Information - Net Sales to Third Parties by Geographic Region (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 466.5	$ 237.3	$ 949.3	$ 477.7
North America (primarily U.S.) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	269.8	119	542.8	244.7
Europe Excluding Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	79.9	42.5	161.7	86.6
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	56.8	48.8	119	98.2
Asia And Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 60	$ 27	$ 125.8	$ 48.2

Derivative Financial Instrume_3

Derivative Financial Instruments - Additional Information (Detail) - USD ($)	Oct. 02, 2018	Dec. 31, 2018	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2023	Dec. 31, 2017	Jan. 31, 2017
Derivative [Line Items]
Currency translation adjustment recorded amount		$ 8,400,000	$ 11,200,000	$ 8,400,000
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Effective portion of gain (loss) on derivative			100,000,000
Interest Income, Net [Member]
Derivative [Line Items]
Cumulative translation adjustment recognized interest income, net amount			7,700,000	800,000
Cross Currency Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, term of contract		5 years
Notional Amount		$ 600,000,000		$ 600,000,000
Fixed Rate		4.8255%		4.8255%
Derivative fees paid to settle swap agreements	$ 14,000,000
Cross Currency Interest Rate Swap [Member] | Forecast [Member]
Derivative [Line Items]
Notional Amount					$ 360,000,000
Cross Currency Interest Rate Swap [Member] | Euro [Member] | Minimum [Member]
Derivative [Line Items]
Variable Rate		2.19%		2.19%
Cross Currency Interest Rate Swap [Member] | Euro [Member] | Maximum [Member]
Derivative [Line Items]
Variable Rate		2.315%		2.315%
Cross Currency Interest Rate Swap Five [Member]
Derivative [Line Items]
Notional Amount			100,000,000
Derivative notional amount terminated	100,000,000
Cross Currency Interest Rate Swap Six [Member]
Derivative [Line Items]
Notional Amount			70,000,000
Derivative notional amount terminated	$ 40,000,000
Cross Currency Interest Rate Swap Seven [Member]
Derivative [Line Items]
Notional Amount			40,000,000
Cross Currency Interest Rate Swap Eight [Member]
Derivative [Line Items]
Notional Amount			30,000,000
Cross Currency Interest Rate Swap Nine [Member]
Derivative [Line Items]
Notional Amount						$ 30,000,000
Interest Rate Swap One [Member]
Derivative [Line Items]
Notional Amount		$ 600,000,000	600,000,000	$ 600,000,000
Fixed Rate		4.8255%		4.8255%
Interest expense			$ 1,000,000
Effective date of interest rate swap		Dec. 4, 2018	Dec. 4, 2018
Maturity date of interest rate swap		Sep. 29, 2023
Interest Rate Swap Two [Member]
Derivative [Line Items]
Notional Amount			$ 50,000,000				$ 50,000,000
Fixed Rate							1.625%
Effective date of interest rate swap			Jan. 31, 2017
Maturity date of interest rate swap			Jan. 31, 2020

Derivative Financial Instrume_4

Derivative Financial Instruments - Summary of Outstanding Swaps (Detail) - USD ($)	1 Months Ended	6 Months Ended
	Dec. 31, 2018	Jun. 30, 2019	Jan. 31, 2017
Cross Currency Interest Rate Swap One [Member]
Derivative [Line Items]
Derivative Entered into		Dec. 10, 2018
Notional Amount		$ 240,000,000
Fixed Rate		2.315%
Settlement Dates		Quarterly on the    last day of each    December,    March, June, and    September
Cross Currency Interest Rate Swap One [Member] | Swap Counterparty [Member]
Derivative [Line Items]
Fixed Rate		4.8255%
Cross Currency Interest Rate Swap One [Member] | USD [Member] | Swap Counterparty [Member]
Derivative [Line Items]
Floating Leg		N/A
Cross Currency Interest Rate Swap One [Member] | Euro [Member]
Derivative [Line Items]
Floating Leg		N/A
Cross Currency Interest Rate Swap Two [Member]
Derivative [Line Items]
Derivative Entered into		Dec. 10, 2018
Notional Amount		$ 192,000,000
Fixed Rate		2.235%
Settlement Dates		Quarterly on the    last day of each    December,    March, June, and    September
Cross Currency Interest Rate Swap Two [Member] | Swap Counterparty [Member]
Derivative [Line Items]
Fixed Rate		4.8255%
Cross Currency Interest Rate Swap Two [Member] | USD [Member] | Swap Counterparty [Member]
Derivative [Line Items]
Floating Leg		N/A
Cross Currency Interest Rate Swap Two [Member] | Euro [Member]
Derivative [Line Items]
Floating Leg		N/A
Cross Currency Interest Rate Swap Three [Member]
Derivative [Line Items]
Derivative Entered into		Dec. 10, 2018
Notional Amount		$ 108,000,000
Fixed Rate		2.19%
Settlement Dates		Quarterly on the    last day of each    December,    March, June, and    September
Cross Currency Interest Rate Swap Three [Member] | Swap Counterparty [Member]
Derivative [Line Items]
Fixed Rate		4.8255%
Cross Currency Interest Rate Swap Three [Member] | USD [Member] | Swap Counterparty [Member]
Derivative [Line Items]
Floating Leg		N/A
Cross Currency Interest Rate Swap Three [Member] | Euro [Member]
Derivative [Line Items]
Floating Leg		N/A
Cross Currency Interest Rate Swap Four [Member]
Derivative [Line Items]
Derivative Entered into		Dec. 10, 2018
Notional Amount		$ 60,000,000
Fixed Rate		2.29%
Settlement Dates		Quarterly on the    last day of each    December,    March, June, and    September
Cross Currency Interest Rate Swap Four [Member] | Swap Counterparty [Member]
Derivative [Line Items]
Fixed Rate		4.8255%
Cross Currency Interest Rate Swap Four [Member] | USD [Member] | Swap Counterparty [Member]
Derivative [Line Items]
Floating Leg		N/A
Cross Currency Interest Rate Swap Four [Member] | Euro [Member]
Derivative [Line Items]
Floating Leg		N/A
Interest Rate Swap One [Member]
Derivative [Line Items]
Derivative Entered into	Dec. 4, 2018	Dec. 4, 2018
Notional Amount	$ 600,000,000	$ 600,000,000
Fixed Rate	4.8255%
Settlement Dates		Monthly on the    last business day    of each month    commencing    with    December 31,    2018 in    accordance with    Modified    Following    Business Day    Convention
Interest Rate Swap One [Member] | Swap Counterparty [Member]
Derivative [Line Items]
Fixed Rate		4.8255%
Interest Rate Swap One [Member] | USD [Member]
Derivative [Line Items]
Floating Leg		1 Month USD- LIBOR- BBA plus 2%
Interest Rate Swap One [Member] | USD [Member] | Swap Counterparty [Member]
Derivative [Line Items]
Floating Leg		Variable rate 1- month USD LIBOR plus 2%
Interest Rate Swap One [Member] | Euro [Member]
Derivative [Line Items]
Floating Leg		1 Month USD- LIBOR- BBA plus 2%
Interest Rate Swap One [Member] | 1-Month Libor [Member]
Derivative [Line Items]
Derivative basis spread on variable rate, thereafter		2.00%
Interest Rate Swap One [Member] | 1-Month Libor [Member] | USD [Member]
Derivative [Line Items]
Derivative variable interest rate		2.00%
Interest Rate Swap Two [Member]
Derivative [Line Items]
Derivative Entered into		Jan. 31, 2017
Notional Amount		$ 50,000,000	$ 50,000,000
Fixed Rate			1.625%
Settlement Dates		Monthly on the    last banking day    of each month    commencing    February 28,    2017
Interest Rate Swap Two [Member] | USD [Member]
Derivative [Line Items]
Fixed Rate		1.625%
Interest Rate Swap Two [Member] | USD [Member] | Swap Counterparty [Member]
Derivative [Line Items]
Floating Leg		Variable rate 1- month USD LIBOR
Interest Rate Swap Two [Member] | Euro [Member]
Derivative [Line Items]
Floating Leg		N/A

Derivative Financial Instrume_5

Derivative Financial Instruments - Summary of Fair Value Level 2 Inputs of Company's Derivatives (Detail) - Level 2 [Member] - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative liability (assets)	$ 18.2	$ 15.8
Designated as Hedging Instrument [Member] | Other Long-Term (Assets) [Member] | Cross Currency Swap Agreements [Member]
Derivative [Line Items]
Derivative assets	(2.9)
Designated as Hedging Instrument [Member] | Other Long-Term (Assets) [Member] | Interest Rate Swap Agreement [Member]
Derivative [Line Items]
Derivative assets	(0.1)	(0.5)
Designated as Hedging Instrument [Member] | Other Long-Term Liabilities [Member] | Cross Currency Swap Agreements [Member]
Derivative [Line Items]
Derivative liability		8.4
Designated as Hedging Instrument [Member] | Other Long-Term Liabilities [Member] | Interest Rate Swap Agreement [Member]
Derivative [Line Items]
Derivative liability	$ 21.2	$ 7.9

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Jun. 30, 2019	Dec. 31, 2018
Schedule Of Commitments And Contingencies [Line Items]
Loss contingency accrual		$ 0	$ 0
Pension Benefits [Member] | US Plan [Member]
Schedule Of Commitments And Contingencies [Line Items]
Final contribution to fund benefit obligation	$ 1.1
Settlement of remaining benefit obligation	18.7
Additional settlement loss	$ 5.1

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - $ / shares	Jul. 22, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Subsequent Event [Line Items]
Cash dividends declared (in USD per share)		$ 0.17	$ 0.17	$ 0.34	$ 0.34
Subsequent Event [Member]
Subsequent Event [Line Items]
Cash dividends declared (in USD per share)	$ 0.17
Dividend declaration date	Jul. 22, 2019
Dividend payable date	Oct. 2, 2019
Dividend record date	Sep. 18, 2019