Modine Manufacturing (MOD) 10-K 24 May 18 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	May 18, 2018	Sep. 29, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	MODINE MANUFACTURING CO
Entity Central Index Key	67,347
Current Fiscal Year End Date	--03-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 941
Entity Common Stock, Shares Outstanding		50,502,209
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period End Date	Mar. 31, 2018

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2018		Mar. 31, 2017		Mar. 31, 2016
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 2,103.1		$ 1,503		$ 1,352.5
Cost of sales	1,746.6		1,248.6		1,118.9
Gross profit	356.5		254.4		233.6
Selling, general and administrative expenses	245.8		203.2		170
Restructuring expenses	16		10.9		16.6
Impairment charges	2.5		0		9.9
Gain on sale of facilities	0		(2)		0
Operating income	92.2		42.3		37.1
Interest expense	(25.6)		(17.2)		(11.1)
Other expense - net	(3.3)		(4.3)		(35.9)
Earnings (loss) before income taxes	63.3		20.8		(9.9)
(Provision) benefit for income taxes	(39.5)		(5.9)		8.9
Net earnings (loss)	23.8		14.9		(1)
Net earnings attributable to noncontrolling interest	(1.6)		(0.7)		(0.6)
Net earnings (loss) attributable to Modine	$ 22.2	[1]	$ 14.2	[2]	$ (1.6)
Net earnings (loss) per share attributable to Modine shareholders:
Basic (in dollars per share)	$ 0.44		$ 0.29		$ (0.03)
Diluted (in dollars per share)	$ 0.43		$ 0.29		$ (0.03)
Weighted-average shares outstanding:
Basic (in shares)	49.9		47.8		47.3
Diluted (in shares)	50.9		48.3		47.3
[1]	During fiscal 2018, restructuring expenses totaled $1.7 million, $0.4 million, $9.4 million, and $4.5 million for the quarters ended June 30, 2017, September 30, 2017, December 31, 2017, and March 31, 2018, respectively (see Note 5). During the third quarter of fiscal 2018, the Company recorded a $1.3 million asset impairment charge related to a manufacturing facility in Austria (see Note 5). During the fourth quarter of fiscal 2018, the Company recorded a $1.2 million impairment charge related to intangible assets (see Note 12). During fiscal 2018, costs directly related to the acquisition and integration of Luvata HTS totaled $1.6 million, $1.1 million, $1.0 million, and $0.6 million for the quarters ended June 30, 2017, September 30, 2017, December 31, 2017, and March 31, 2018, respectively (see Note 2). The Company recorded charges totaling $35.7 million and $2.3 million resulting for certain income tax effects of recently-enacted U.S. tax legislation in the quarters ended December 31, 2017 and March 31, 2018, respectively (see Note 7). During the fourth quarter of fiscal 2018, the Company reversed a portion of a valuation allowance related to a foreign tax jurisdiction, and, as a result, recorded an income tax benefit of $2.8 million (see Note 7).
[2]	During fiscal 2017, restructuring expenses totaled $2.3 million, $2.1 million, $1.6 million, and $4.9 million for the quarters ended June 30, 2016, September 30, 2016, December 31, 2016, and March 31, 2017, respectively (see Note 5). During fiscal 2017, the Company sold two previously-closed manufacturing facilities in its Americas segment and a facility in its Europe segment and recognized net gains totaling $1.2 million and $0.8 million in the quarters ended September 30, 2016 and March 31, 2017, respectively. During fiscal 2017, costs directly related to the acquisition and integration of Luvata HTS totaled $1.4 million, $3.0 million, $7.2 million, and $3.2 million for the quarters ended June 30, 2016, September 30, 2016, December 31, 2016, and March 31, 2017, respectively (see Note 2). During the fourth quarter of fiscal 2017, the Company recorded a deferred tax valuation allowance related to a foreign tax jurisdiction, and, as a result, recorded income tax expense of $2.0 million (see Note 7).

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net earnings (loss)	$ 23.8	$ 14.9	$ (1)
Other comprehensive income (loss):
Foreign currency translation	41.8	(10.8)	4.6
Defined benefit plans, net of income taxes of $(0.2), $1.7 and $11.8 million	0.1	3.2	19.7
Cash flow hedges, net of income taxes of $0.1, $0 and $0 million	0.1	0	0
Total other comprehensive income (loss)	42	(7.6)	24.3
Comprehensive income (loss)	65.8	7.3	23.3
Comprehensive income attributable to noncontrolling interest	(2.1)	(0.7)	(0.5)
Comprehensive income attributable to Modine	$ 63.7	$ 6.6	$ 22.8

CONSOLIDATED STATEMENTS OF COM4

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Other comprehensive income (loss):
Defined benefit plans, tax	$ (0.2)	$ 1.7	$ 11.8
Cash flow hedges, tax	$ 0.1	$ 0	$ 0

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Mar. 31, 2018	Mar. 31, 2017
ASSETS
Cash and cash equivalents	$ 39.3	$ 34.2
Trade accounts receivable - net	342.4	295.2
Inventories	191.3	168.5
Other current assets	70.1	55.4
Total current assets	643.1	553.3
Property, plant and equipment - net	504.3	459
Intangible assets - net	129.9	134.1
Goodwill	173.8	165.1
Deferred income taxes	96.9	108.4
Other noncurrent assets	25.4	29.6
Total assets	1,573.4	1,449.5
LIABILITIES AND SHAREHOLDERS' EQUITY
Short-term debt	53.2	73.4
Long-term debt - current portion	39.9	31.8
Accounts payable	277.9	230.3
Accrued compensation and employee benefits	97.3	74.8
Other current liabilities	47.2	45.1
Total current liabilities	515.5	455.4
Long-term debt	386.3	405.7
Deferred income taxes	9.9	9.7
Pensions	109.6	119.4
Other noncurrent liabilities	53.6	38.1
Total liabilities	1,074.9	1,028.3
Commitments and contingencies (see Note 18)
Shareholders' equity:
Preferred stock, $0.025 par value, authorized 16.0 million shares, issued - none	0	0
Common stock, $0.625 par value, authorized 80.0 million shares, issued 52.3 million and 51.8 million shares	32.7	32.4
Additional paid-in capital	229.9	216.4
Retained earnings	394.9	372.4
Accumulated other comprehensive loss	(140.3)	(181.8)
Treasury stock, at cost, 1.8 million and 1.7 million shares	(27.1)	(25.4)
Total Modine shareholders' equity	490.1	414
Noncontrolling interest	8.4	7.2
Total equity	498.5	421.2
Total liabilities and equity	$ 1,573.4	$ 1,449.5

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares shares in Millions	Mar. 31, 2018	Mar. 31, 2017
Shareholders' equity:
Preferred stock, par value (in dollars per share)	$ 0.025	$ 0.025
Preferred stock, shares authorized (in shares)	16	16
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.625	$ 0.625
Common stock, shares authorized (in shares)	80	80
Common stock, shares issued (in shares)	52.3	51.8
Treasury stock at cost (in shares)	1.8	1.7

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net earnings (loss)	$ 23.8	$ 14.9	$ (1)
Adjustments to reconcile net earnings (loss) to net cash provided by operating activities:
Depreciation and amortization	76.7	58.3	50.2
Stock-based compensation expense	9.5	7.4	4.9
Impairment charges	2.5	0	9.9
Gain on sale of facilities	0	(2)	0
Deferred income taxes	12.1	(4.6)	(18.8)
Pension and postretirement expense	3.9	3.4	45.1
Insurance proceeds from Airedale fire	0	0	5.9
Other - net	5.1	0.5	0.1
Changes in operating assets and liabilities, excluding acquisitions:
Trade accounts receivable	(26.1)	(25.7)	8
Inventories	(12.5)	(3.3)	(2.7)
Accounts payable	25.2	19.9	(9.9)
Accrued compensation and employee benefits	16.4	(6.5)	0.8
Other assets	(5.4)	(2.5)	(14.5)
Other liabilities	(7.4)	(18.2)	(5.6)
Net cash provided by operating activities	123.8	41.6	72.4
Cash flows from investing activities:
Expenditures for property, plant and equipment	(71)	(64.4)	(62.8)
Acquisitions - net of cash acquired	0	(364.2)	(1.4)
Proceeds from dispositions of assets	0.3	5.7	0.4
Purchases of short-term investments	(5.5)	(3.5)	(2.7)
Proceeds from maturities of short-term investments	4.8	2.2	2.1
Insurance proceeds from Airedale fire	0	3	27.4
Costs to replace building and equipment damaged in Airedale fire	0	(1)	(41.7)
Other - net	(0.2)	0	0.9
Net cash used for investing activities	(71.6)	(422.2)	(77.8)
Cash flows from financing activities:
Borrowings of debt	171	559.1	38
Repayments of debt	(222.9)	(202.4)	(27.1)
Dividend paid to noncontrolling interest	(0.9)	0	(0.9)
Financing fees paid	0	(8.7)	0
Purchases of treasury stock under share repurchase program	0	0	(6.9)
Other - net	2.7	(0.4)	(0.4)
Net cash (used for) provided by financing activities	(50.1)	347.6	2.7
Effect of exchange rate changes on cash	3	(1.7)	1.1
Net increase (decrease) in cash and cash equivalents	5.1	(34.7)	(1.6)
Cash and cash equivalents - beginning of year	34.2	68.9	70.5
Cash and cash equivalents - end of year	$ 39.3	$ 34.2	$ 68.9

CONSOLIDATED STATEMENTS OF SHAR

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions	Common stock [Member]	Additional Paid-in Capital [Member]	Retained earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury stock, at cost [Member]	Non-controlling interest [Member]	Total
Balance at Mar. 31, 2015	$ 30.4	$ 180.6	$ 359.8	$ (198.6)	$ (16.2)	$ 4.6	$ 360.6
Balance (in shares) at Mar. 31, 2015	48.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss) attributable to Modine	$ 0	0	(1.6)	0	0	0	(1.6)
Other comprehensive income (loss)	0	0	0	24.4	0	(0.1)	24.3
Stock options and awards including related tax benefits	$ 0.2	0.1	0	0	0	0	0.3
Stock options and awards including related tax benefits (in shares)	0.4
Purchase of treasury stock	$ 0	0	0	0	(7.8)	0	(7.8)
Stock-based compensation expense	0	4.9	0	0	0	0	4.9
Contribution by noncontrolling interest	0	0	0	0	0	2.3	2.3
Dividend paid to noncontrolling interest	0	0	0	0	0	(0.9)	(0.9)
Net earnings attributable to noncontrolling interest	0	0	0	0	0	0.6	0.6
Balance at Mar. 31, 2016	$ 30.6	185.6	358.2	(174.2)	(24)	6.5	382.7
Balance (in shares) at Mar. 31, 2016	49
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss) attributable to Modine	$ 0	0	14.2	0	0	0	14.2	[1]
Other comprehensive income (loss)	0	0	0	(7.6)	0	0	(7.6)
Shares issued for acquisition of Luvata HTS	$ 1.4	22.9	0	0	0	0	24.3
Shares issued for acquisition of Luvata HTS (in shares)	2.2
Stock options and awards including related tax benefits	$ 0.4	0.5	0	0	0	0	0.9
Stock options and awards including related tax benefits (in shares)	0.6
Purchase of treasury stock	$ 0	0	0	0	(1.4)	0	(1.4)
Stock-based compensation expense	0	7.4	0	0	0	0	7.4
Net earnings attributable to noncontrolling interest	0	0	0	0	0	0.7	0.7
Balance at Mar. 31, 2017	$ 32.4	216.4	372.4	(181.8)	(25.4)	7.2	$ 421.2
Balance (in shares) at Mar. 31, 2017	51.8						51.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of new accounting guidance - stock-based compensation (Note 1)	$ 0	0.1	0.3	0	0	0	$ 0.4
Net earnings (loss) attributable to Modine	0	0	22.2	0	0	0	22.2	[2]
Other comprehensive income (loss)	0	0	0	41.5	0	0.5	42
Stock options and awards including related tax benefits	$ 0.3	3.9	0	0	0	0	4.2
Stock options and awards including related tax benefits (in shares)	0.5
Purchase of treasury stock	$ 0	0	0	0	(1.7)	0	(1.7)
Stock-based compensation expense	0	9.5	0	0	0	0	9.5
Dividend paid to noncontrolling interest	0	0	0	0	0	(0.9)	(0.9)
Net earnings attributable to noncontrolling interest	0	0	0	0	0	1.6	1.6
Balance at Mar. 31, 2018	$ 32.7	$ 229.9	$ 394.9	$ (140.3)	$ (27.1)	$ 8.4	$ 498.5
Balance (in shares) at Mar. 31, 2018	52.3						52.3
[1]	During fiscal 2017, restructuring expenses totaled $2.3 million, $2.1 million, $1.6 million, and $4.9 million for the quarters ended June 30, 2016, September 30, 2016, December 31, 2016, and March 31, 2017, respectively (see Note 5). During fiscal 2017, the Company sold two previously-closed manufacturing facilities in its Americas segment and a facility in its Europe segment and recognized net gains totaling $1.2 million and $0.8 million in the quarters ended September 30, 2016 and March 31, 2017, respectively. During fiscal 2017, costs directly related to the acquisition and integration of Luvata HTS totaled $1.4 million, $3.0 million, $7.2 million, and $3.2 million for the quarters ended June 30, 2016, September 30, 2016, December 31, 2016, and March 31, 2017, respectively (see Note 2). During the fourth quarter of fiscal 2017, the Company recorded a deferred tax valuation allowance related to a foreign tax jurisdiction, and, as a result, recorded income tax expense of $2.0 million (see Note 7).
[2]	During fiscal 2018, restructuring expenses totaled $1.7 million, $0.4 million, $9.4 million, and $4.5 million for the quarters ended June 30, 2017, September 30, 2017, December 31, 2017, and March 31, 2018, respectively (see Note 5). During the third quarter of fiscal 2018, the Company recorded a $1.3 million asset impairment charge related to a manufacturing facility in Austria (see Note 5). During the fourth quarter of fiscal 2018, the Company recorded a $1.2 million impairment charge related to intangible assets (see Note 12). During fiscal 2018, costs directly related to the acquisition and integration of Luvata HTS totaled $1.6 million, $1.1 million, $1.0 million, and $0.6 million for the quarters ended June 30, 2017, September 30, 2017, December 31, 2017, and March 31, 2018, respectively (see Note 2). The Company recorded charges totaling $35.7 million and $2.3 million resulting for certain income tax effects of recently-enacted U.S. tax legislation in the quarters ended December 31, 2017 and March 31, 2018, respectively (see Note 7). During the fourth quarter of fiscal 2018, the Company reversed a portion of a valuation allowance related to a foreign tax jurisdiction, and, as a result, recorded an income tax benefit of $2.8 million (see Note 7).

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Mar. 31, 2018
Significant Accounting Policies [Abstract]
Significant Accounting Policies	Note 1: Significant Accounting Policies Nature of operations: Acquisition of Luvata HTS: Basis of presentation: Consolidation principles: The Company accounts for investments in non-consolidated affiliated companies in which its ownership is 20 percent or more using the equity method. The Company states these investments at cost, plus or minus a proportionate share of undistributed net earnings. The Company includes Modine’s share of the affiliate’s net earnings in other income and expense. See Note 11 for additional information. Airedale facility fire: Revenue recognition: Tooling costs: Warranty: Shipping and handling costs: Stock-based compensation: Research and development: Translation of foreign currencies: Derivative instruments: Income taxes: Earnings per share: Cash and cash equivalents: Short-term investments: Trade accounts receivable: Inventories: Property, plant and equipment Goodwill: Impairment of long-lived assets: Assets held for sale: Deferred compensation trusts: Self-insurance reserves: Environmental liabilities: New Accounting Guidance: Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income In February 2018, the Financial Accounting Standards Board (“FASB”) issued new guidance related to the accounting for certain stranded income tax effects in accumulated other comprehensive income (loss) resulting from tax reform legislation that was enacted in the U.S. in December 2017. This guidance provides companies with the option to reclassify stranded income tax effects to retained earnings and will be effective for the Company’s first quarter of fiscal 2020. The Company is currently evaluating the impact this guidance will have on its consolidated financial statements. Derivatives and Hedging In August 2017, the FASB issued new guidance related to hedge accounting. The main objectives of the new guidance include aligning hedge accounting with the companies’ risk management strategies and increasing disclosure transparency regarding both the scope and the results of hedging programs. The Company early adopted the new guidance in the third quarter of fiscal 2018. This new guidance did not have a material impact on the Company’s consolidated financial statements. Pension Costs In March 2017, the FASB issued new guidance related to the income statement presentation of pension and postretirement costs. This guidance requires companies to continue to present the service cost component of net periodic benefit cost within the same financial statement line item as other employee compensation costs; however, other components of net benefit cost are required to be presented outside of results from operations. The Company adopted this guidance, on a retrospective basis, in fiscal 2018. As a result, the Company recorded $3.3 million of net periodic benefit cost within other income and expense for the fiscal year ended March 31, 2018 and reclassified the net periodic benefit cost, exclusive of service cost, to other income and expense for the prior-year periods. For fiscal 2017 and 2016, the Company reclassified net periodic benefit cost totaling $2.9 million ($1.1 million from cost of sales and $1.8 million from SG&A expenses) and $44.6 million ($10.1 million from cost of sales and $34.5 million from SG&A expenses), respectively, to other income and expense. Income Taxes: Intra-Entity Transfers of Assets Other Than Inventory In October 2016, the FASB issued new guidance related to income tax accounting for intercompany asset transfers. This new guidance requires companies to recognize the income tax effects of intercompany asset transfers other than inventory at the transaction date. The income tax effects of these transfers were previously deferred. This new guidance is effective for the Company’s first quarter of fiscal 2019. As a result of adopting this new guidance using the modified-retrospective transition method, the Company expects to record a decrease to retained earnings of approximately $8.0 million as of April 1, 2018. Stock-based Compensation In March 2016, the FASB issued new guidance to simplify several aspects of accounting for stock-based payment transactions. The Company adopted this guidance beginning in its first quarter of fiscal 2018. The Company elected to account for forfeitures in the period in which they occur and recorded a cumulative-effect adjustment to equity. In addition, the Company prospectively adopted the guidance requiring all excess tax benefits or deficiencies to be recognized as income tax expense or benefit when share-based awards are settled. The provisions of this guidance did not have a material impact on the Company's consolidated financial statements. As a result of adopting this new guidance, the Company recorded a $0.4 million increase to both deferred tax assets and equity as of April 1, 2017. Leases In February 2016, the FASB issued new comprehensive lease accounting guidance that supersedes existing lease accounting guidance. Upon adoption of this new guidance, the Company will be required to recognize most leases on its balance sheet. This guidance is effective for the Company’s first quarter of fiscal 2020. The Company is currently evaluating the impact this guidance will have on its consolidated financial statements. Revenue Recognition In May 2014, the FASB issued new guidance that outlines a comprehensive model for entities to use in accounting for revenue arising from contracts with customers. The core principle of the new guidance is that companies are to recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The new guidance also includes a cohesive set of disclosure requirements intended to provide users of financial statements with comprehensive information about revenue arising from contracts with customers. This new guidance is effective for the Company’s first quarter of fiscal 2019, and the Company plans to adopt it using a modified-retrospective transition method. The Company will recognize the cumulative effect of initially applying the standard as an adjustment to retained earnings. The Company has assessed customer contracts and evaluated contractual provisions in light of the new guidance. Under current guidance, the Company generally recognizes revenue when products are shipped and risk of loss has transferred to the customer. Through its evaluation process, the Company has identified a limited number of customer contracts that provide an enforceable right to payment for customized products, which will require revenue recognition prior to the product being shipped to the customer. In addition, the Company has evaluated pricing provisions contained in certain of its customer contracts to determine the appropriate amount and timing of revenue recognized based upon the new guidance. As a result of its adoption of the new guidance, the Company expects to record an increase of less than $1.0 million to retained earnings as of April 1, 2018, along with related balance sheet reclassifications. The expected increase to retained earnings reflects approximately $3.0 million of net sales that, had the new guidance been in effect, the Company would have recognized as of March 31, 2018. The Company is still assessing the enhanced disclosure requirements of the new guidance. Supplemental cash flow information: Years ended March 31, 2018 2017 2016 Interest paid $ 23.4 $ 15.4 $ 10.7 Income taxes paid 20.1 12.7 10.1

Acquisitions

Acquisitions	12 Months Ended
	Mar. 31, 2018
Acquisitions [Abstract]
Acquisitions	Note 2: Acquisitions Luvata HTS On November 30, 2016, the Company completed its acquisition of a 100 percent ownership interest in the Luvata HTS business for consideration totaling $415.6 million ($388.2 million, net of cash acquired). The purchase price included 2.2 million Modine common shares, valued at $24.3 million as of November 30, 2016. Operating as Modine’s Commercial and Industrial Solutions (“CIS”) segment, this business is a leading global supplier of coils, coolers and coatings to the heating, ventilation, air conditioning, and refrigeration industry. For the year ended March 31, 2018, the Company included $620.0 million of net sales and operating income of $25.8 million within its consolidated statement of operations attributable to CIS operations. For the year ended March 31, 2017, the Company included $177.7 million of net sales and operating income of $7.5 million attributable to four months of CIS operations. In fiscal 2018 and 2017, the Company recorded $4.3 million and $14.8 million, respectively, of costs incurred directly related to the acquisition and integration of Luvata HTS as SG&A expenses within the consolidated statements of operations. The fiscal 2018 costs primarily consisted of incremental costs associated with integration activities, including legal and accounting professional services and severance expenses. The fiscal 2017 costs primarily consisted of transaction advisory and due diligence costs and incremental costs directly associated with integration activities. The Company has completed the purchase price allocation for its acquisition of Luvata HTS. The purchase price of $415.6 million was allocated to the identifiable tangible and intangible assets acquired and the liabilities assumed based upon their estimated fair values as of the acquisition date. The Company based the estimated fair values primarily upon third-party valuations using assumptions developed by management and other information compiled by management, including, but not limited to, future expected cash flows. The Company allocated the excess of the purchase price over the net assets recognized to goodwill in the amount of $151.9 million, none of which is deductible for income tax purposes. During the first and second quarters of fiscal 2018, the Company recorded measurement-period adjustments which resulted in a $1.3 million increase to the $150.6 million of goodwill preliminarily recorded as of March 31, 2017. The increase was primarily due to increases to income tax reserves and changes in liabilities for product warranties. Goodwill represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. Specifically, the goodwill recorded as part of the acquisition includes Luvata HTS’s workforce and anticipated future cost and revenue synergies. The Company’s allocation of the purchase price for its acquisition of Luvata HTS was as follows: Cash and cash equivalents $ 27.4 Trade accounts receivable 86.1 Inventories 55.0 Property, plant and equipment 120.4 Intangible assets 130.2 Goodwill 151.9 Other assets 39.1 Accounts payable (73.7 ) Accrued compensation and employee benefits (24.3 ) Deferred income taxes (39.5 ) Pensions (14.3 ) Other liabilities (42.7 ) Purchase price $ 415.6 Below is a summary of the methodologies and significant assumptions used in estimating the fair value of certain classes of acquired assets. The fair values were Inventories: Property, plant and equipment: The Company valued property, plant and equipment primarily utilizing the cost approach and also utilized the market approach in valuing acquired land and buildings. The cost approach considers the amount required to replace an asset by constructing or purchasing a new asset with similar utility and adjusting the value in consideration of depreciation as of the acquisition date. The cost approach relies on assumptions regarding replacement costs and the age and estimated remaining useful lives of the assets. The fair value of property, plant and equipment will be recognized as depreciation expense in our results of operations over the expected remaining useful lives of the individual assets. Intangible assets Gross Weighted- Customer relationships $ 58.4 17 years Trade names 50.1 20 years Acquired technology 21.7 12 years Total intangible assets acquired $ 130.2 Customer relationships, for valuation purposes, represent the estimated fair value of Luvata HTS’s business relationship with existing customers, and were calculated by projecting the future after-tax cash flows from these customers, including the right to deploy and market additional products to them. The Company forecasted anticipated earnings from existing customers using recent years’ sales levels and considering a customer attrition rate based upon historical customer revenue information. The Company determined the value of acquired trade names using the relief-from-royalty method, a variation of the income approach, which applies an assumed royalty rate to revenue expected to be derived under the acquired trade names. The fair value was estimated to be the present value of the royalties saved because the Company owns the trade names. The Company also used the relief-from royalty method for its valuation of acquired technology, which largely relates to the design of mechanical and electrical components. The Company considered factors including the estimated contribution of the technology to the overall profitability of the products and the awareness level of the technology and its position in the market. The following unaudited supplemental pro forma information presents the Company’s consolidated results of operations as though the acquisition of Luvata HTS had occurred at the beginning of fiscal 2016. This pro forma financial information is presented for illustrative purposes only and is not considered to be indicative of the operating results that would have been achieved had the acquisition been completed as of the date indicated. Years ended March 31, 2017 2016 Net sales $ 1,881.6 $ 1,871.9 Net earnings attributable to Modine 35.8 1.5 Net earnings per share attributable to Modine shareholders: Basic $ 0.72 $ 0.03 Diluted 0.71 0.03 The supplemental pro forma financial information includes adjustments for: (i) annual amortization and depreciation expense totaling approximately $13.0 million for acquired tangible and intangible assets, (ii) estimated annual interest expense of approximately $14.0 million resulting from acquisition-related borrowings, and (iii) the estimated income tax impacts related to the pro forma adjustments, considering the statutory tax rates within the applicable jurisdictions. In addition, the pro forma financial information assumes that both $8.6 million of acquisition-related transaction costs, not including costs for integration-related activities, and $4.3 million of inventory purchase accounting adjustments were incurred during fiscal 2016. The pro forma financial information does not reflect achieved or expected cost or revenue synergies. Modine Puxin Thermal Systems (Jiangsu) Co. Ltd On January 29, 2016, the Company formed a joint venture, Modine Puxin Thermal Systems (Jiangsu) Co. Ltd. of Yangzhou, China, of which it owns 67 percent, and the joint venture partner, Jiangsu Puxin Heat Exchange System Co., Ltd, owns 33 percent. This joint venture, which is reported in the Asia segment, expedited the Company’s introduction of stainless steel heat exchangers for the light-, medium-, and heavy-duty commercial vehicle markets in China. In fiscal 2016, the Company contributed $1.4 million of cash and equipment and other assets totaling $2.3 million. In fiscal 2017, the Company contributed $0.3 million of additional cash consideration after certain seller indemnification obligations under the agreement were satisfied. The Company recorded assets acquired and liabilities assumed at their respective fair values. The purchase price allocation resulted in acquired equipment and other long-lived assets totaling $1.5 million and working capital net assets of $0.8 million. The Company controls the primary management decisions and revenue-generating activities of the joint venture, and, therefore, the financial results of the joint venture are included in the Company’s consolidated financial statements. The Company did not present pro forma financial information for this acquisition as the effect is not material to its results of operations or financial position.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Mar. 31, 2018
Fair Value Measurements [Abstract]
Fair Value Measurements	Note 3: Fair Value Measurements Fair value is defined as the price that would be received for an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants. Fair value measurements are classified under the following hierarchy: · Level 1 – Quoted prices for identical instruments in active markets. · Level 2 – Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs are observable in active markets. · Level 3 – Model-derived valuations in which one or more significant inputs are not observable. When available, the Company uses quoted market prices to determine fair value and classifies such measurements as Level 1. In some cases, where market prices are not available, the Company uses observable market-based inputs to calculate fair value, in which case the measurements are classified as Level 2. If quoted or observable market prices are not available, the Company determines fair value based upon valuation models that use, where possible, market-based data such as interest rates, yield curves or currency rates. These measurements are classified as Level 3. The carrying values of cash and cash equivalents, short-term investments, trade accounts receivable, accounts payable, and short-term debt approximate fair value due to the short-term nature of these instruments. The Company holds trading securities in deferred compensation trusts to fund obligations under certain non-qualified deferred compensation plans. The securities’ fair values, which are recorded as other noncurrent assets, are determined based upon quoted prices from active markets and classified within Level 1 of the valuation hierarchy. The Company’s deferred compensation obligations, which are recorded as other noncurrent liabilities, are recorded at the fair values of the investments held by the trust. The fair values of the Company’s trading securities and deferred compensation obligations each totaled $5.8 million and $5.0 million at March 31, 2018 and 2017, respectively. The fair value of the Company’s long-term debt is disclosed in Note 15. Plan assets related to the Company’s pension plans were classified as follows: March 31, 2018 Level 1 Level 2 Total Money market investments $ - $ 11.4 $ 11.4 Common stocks 9.4 2.6 12.0 Corporate bonds - 9.7 9.7 Pooled equity funds 64.4 - 64.4 Pooled fixed-income funds 27.3 - 27.3 U.S. government and agency securities - 16.2 16.2 Other 0.2 1.7 1.9 Fair value excluding investment measured at net asset value 101.3 41.6 142.9 Investment measured at net asset value (a) 14.8 Total Fair Value $ 157.7 March 31, 2017 Level 1 Level 2 Total Money market investments $ - $ 5.6 $ 5.6 Common stocks 17.8 2.0 19.8 Corporate bonds - 9.3 9.3 Pooled equity funds 56.8 - 56.8 Pooled fixed-income funds 26.5 - 26.5 U.S. government and agency securities - 18.7 18.7 Other 1.4 1.4 2.8 Fair value excluding investment measured at net asset value 102.5 37.0 139.5 Investment measured at net asset value (a) 8.7 Total Fair Value $ 148.2 (a) As a practical expedient, the Company valued a collective trust fund using its net asset value per unit, and therefore, has not classified this investment within the fair value hierarchy. The Company determined the fair value of money market investments to approximate their net asset values, without discounts for credit quality or liquidity restrictions, and classified them within Level 2 of the valuation hierarchy. The Company determined the fair value of common stocks, pooled equity funds and pooled fixed-income funds based upon quoted prices from active markets and classified them within Level 1 of the valuation hierarchy. The Company determined the fair value of certain common stocks, corporate bonds and U.S. government and agency securities based upon recent bid prices or the average of recent bid and asking prices when available and, if not available, the Company valued them through matrix pricing models developed by sources considered by management to be reliable. The Company classified these assets within Level 2 of the valuation hierarchy. As of March 31, 2018 and 2017, the Company held no Level 3 assets within its pension plans.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Mar. 31, 2018
Stock-Based Compensation [Abstract]
Stock-Based Compensation	Note 4: Stock-Based Compensation The Company’s stock-based incentive programs consist of the following: (1) a long-term incentive compensation program for officers and other executives that consists of stock awards, stock options, and performance-based stock awards granted for retention and performance, (2) a discretionary equity program for other management and key employees, and (3) stock awards for non-employee directors. The Company’s Board of Directors and the Officer Nomination and Compensation Committee, as applicable, have discretionary authority to set the terms of the stock awards. Grants to employees during fiscal 2018 and prior were issued under the Company’s Amended and Restated 2008 Incentive Compensation Plan. All future grants will be issued under the Company’s 2017 Incentive Compensation Plan. At present, the Company accomplishes the fulfillment of equity-based grants through the issuance of new common shares. As of March 31, 2018, approximately 3.6 million shares authorized under the 2017 Incentive Compensation Plan remain available for future grants. Employee participants have the opportunity to deliver back to the Company the number of shares from the vesting of stock awards sufficient to satisfy the individual’s minimum tax withholding obligations. These shares are held as treasury shares. The Company recorded stock-based compensation expense of $9.5 million, $7.4 million, and $4.9 million in fiscal 2018, 2017, and 2016, respectively. Stock Options: The Company estimated the fair value of option awards on the date of grant using the Black-Scholes option valuation model and the following assumptions: Years ended March 31, 2018 2017 2016 Fair value of options $ 7.30 $ 4.60 $ 7.11 Expected life of awards in years 6.4 6.4 6.3 Risk-free interest rate 1.9 % 1.4 % 1.9 % Expected volatility of the Company's stock 44.3 % 45.5 % 66.9 % Expected dividend yield on the Company's stock 0.0 % 0.0 % 0.0 % Stock options expire no later than 10 years after the grant date and have an exercise price equal to the fair market value of Modine’s common stock on the date of grant. The risk-free interest rate was based upon yields of U.S. Treasury zero-coupon issues with a term corresponding to the expected life of the options. The expected volatility assumption was based upon changes in the Company’s historical common stock prices over the same time frame as the expected life of the awards. The expected dividend yield is zero, as the Company currently does not anticipate paying dividends over the expected life of the options. The expected lives of the awards are based upon historical patterns and the terms of the options. Outstanding options granted vest 25 percent annually for four years. A summary of stock option activity for fiscal 2018 was as follows: Shares Weighted-average exercise price Weighted-average remaining contractual term (years) Aggregate intrinsic value Outstanding, beginning 1.5 $ 9.83 Granted 0.2 15.90 Exercised (0.4 ) 8.89 Forfeited or expired (0.1 ) 12.64 Outstanding, ending 1.2 $ 11.16 6.1 $ 12.2 Exercisable, March 31, 2018 0.7 $ 9.99 4.6 $ 8.0 The aggregate intrinsic value represents the difference between the closing price of Modine’s common shares on the last trading day of fiscal 2018 over the exercise price of the stock options, multiplied by the number of options outstanding or exercisable. The aggregate intrinsic value is not recorded for financial statement purposes, and this value will change based upon daily changes in the fair value of Modine’s common shares. Additional information related to stock options exercised is as follows: Years ended March 31, 2018 2017 2016 Intrinsic value of stock options exercised $ 4.9 $ 0.5 $ 0.4 Proceeds from stock options exercised $ 4.3 $ 0.9 $ 0.5 Restricted Stock: A summary of restricted stock activity for fiscal 2018 was as follows: Shares Weighted- Non-vested balance, beginning 0.6 $ 11.21 Granted 0.3 16.12 Vested (0.3 ) 12.56 Non-vested balance, ending 0.6 $ 12.24 Restricted Stock – Performance-Based Shares: Shares are earned under the performance portion of the restricted stock award program based upon the attainment of certain financial goals over a three-year period and are awarded after the end of that three-year performance period, if the performance targets have been achieved. The performance components of the programs initiated in fiscal 2018, 2017, and 2016 were based upon both a target three-year average consolidated return on average capital employed (“ROACE”) and a target three-year average annual revenue growth at the end of a three-year performance period, commencing with the fiscal year of grant.

Restructuring Activities

Restructuring Activities	12 Months Ended
	Mar. 31, 2018
Restructuring Activities [Abstract]
Restructuring Activities	Note 5: Restructuring Activities During fiscal 2018, the Company ceased production at its Gailtal, Austria manufacturing facility, primarily to reduce excess capacity and lower manufacturing costs in Europe. As a result of this facility closure, the Company recorded $8.3 million of restructuring expenses, within the CIS segment, during fiscal 2018. These restructuring expenses primarily related to employee severance and related benefits. The Company also recorded a $1.3 million asset impairment charge to reduce the carrying value of the Gailtal, Austria facility to its estimated fair value, less costs to sell. The Company’s restructuring actions during fiscal 2018 also included targeted headcount reductions in the Europe and Americas segments, plant consolidation activities in the Americas segment, and costs resulting from the transfer of production of certain product lines to Hungary from other manufacturing facilities within the Europe segment. The Company’s objective for the product line transfers to Hungary was primarily to expand its low-cost country footprint in Europe and to ensure continued competitiveness in the region. In addition, the Company recorded restructuring costs associated with the discontinuance of its geothermal product line within its BHVAC segment. During fiscal 2017, the Company completed a voluntary retirement program for certain U.S. salaried employees and implemented targeted headcount reductions at several locations, both in support of its objective to reduce operational and SG&A cost structures. During fiscal 2016, the Company announced a plan to close its Washington, Iowa manufacturing facility and recorded severance costs as a result. The Company completed the transfer of production from Washington to other Americas segment manufacturing facilities in fiscal 2017. Also during fiscal 2016, the Company completed the transfer of production from its McHenry, Illinois manufacturing facility to other Americas segment manufacturing facilities. These restructuring activities reflect the Company’s focus on operating scale manufacturing facilities to improve overall competitiveness and profitability. Restructuring and repositioning expenses were as follows: Years ended March 31, 2018 2017 2016 Employee severance and related benefits $ 13.0 $ 5.3 $ 12.8 Other restructuring and repositioning expenses 3.0 5.6 3.8 Total $ 16.0 $ 10.9 $ 16.6 Other restructuring and repositioning expenses primarily consist of equipment transfer and plant consolidation costs. The Company accrues severance in accordance with its written plans, procedures, and relevant statutory requirements. Changes in accrued severance were as follows: Years ended March 31, 2018 2017 Beginning balance $ 6.5 $ 14.7 Additions 13.0 5.3 Payments (9.4 ) (12.9 ) Effect of exchange rate changes 0.9 (0.6 ) Ending balance $ 11.0 $ 6.5 During fiscal 2017, the Company sold two previously-closed manufacturing facilities within its Americas segment and a facility within its Europe segment, for cash proceeds totaling $5.4 million. As a result of the facility sales, the Company recorded net gains totaling $2.0 million. During fiscal 2016, the Company recorded an asset impairment charge of $9.9 million within its Europe segment to write down long-lived assets at a manufacturing facility in Germany to fair value.

Other Income and Expense

Other Income and Expense	12 Months Ended
	Mar. 31, 2018
Other Income and Expense [Abstract]
Other Income and Expense	Note 6: Other Income and Expense Other income and expense consisted of the following: Years ended March 31, 2018 2017 2016 Equity in earnings of non-consolidated affiliate $ 0.2 $ 0.1 $ 0.1 Interest income 0.4 0.4 0.4 Foreign currency transactions (a) (0.6 ) (1.9 ) (1.3 ) Net periodic benefit cost (b) (3.3 ) (2.9 ) (44.6 ) Gain from insurance recovery (c) - - 9.5 Total other expense - net $ (3.3 ) $ (4.3 ) $ (35.9 ) (a) Foreign currency transactions primarily consist of foreign currency transaction gains and losses on the re-measurement or settlement of foreign currency-denominated assets and liabilities, including intercompany loans and transactions denominated in a foreign currency, along with gains and losses on foreign currency exchange contracts. (b) Represents net periodic benefit cost, exclusive of service cost, for the Company’s pension and postretirement plans. (c) During fiscal 2016, the Company settled an insurance claim related to machinery and equipment destroyed in a fire at its Airedale facility and recorded a gain of $9.5 million. See Note 1 for additional information.

Income Taxes

Income Taxes	12 Months Ended
	Mar. 31, 2018
Income Taxes [Abstract]
Income Taxes	Note 7: Income Taxes The U.S. and foreign components of earnings before income taxes and the provision or benefit for income taxes consisted of the following: Years ended March 31, 2018 2017 2016 Components of earnings (loss) before income taxes: United States $ 2.5 $ (8.6 ) $ (15.4 ) Foreign 60.8 29.4 5.5 Total earnings (loss) before income taxes $ 63.3 $ 20.8 $ (9.9 ) Income tax provision (benefit): Federal: Current $ 11.6 $ 0.1 $ 0.1 Deferred 23.3 (3.8 ) (13.0 ) State: Current (0.3 ) 0.3 0.2 Deferred 2.0 (0.2 ) (2.5 ) Foreign: Current 16.1 10.1 9.6 Deferred (13.2 ) (0.6 ) (3.3 ) Total income tax provision (benefit) $ 39.5 $ 5.9 $ (8.9 ) On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the “Tax Act”). The Tax Act includes broad and complex changes to the U.S. tax code, including (i) a reduction in the U.S. federal corporate tax rate from 35 percent to 21 percent effective January 1, 2018, and (ii) a transition tax on certain unrepatriated earnings of foreign subsidiaries. For fiscal 2018, the Company recorded its income tax provision based on a blended U.S. statutory tax rate of 31.5 percent, which is based on a proration of the applicable tax rates before and after the effective date of the Tax Act. The statutory tax rate of 21 percent will apply for fiscal 2019 and beyond. The Tax Act also puts in place new tax laws that may impact the Company’s taxable income beginning in fiscal 2019, which include, but are not limited to (i) creating a base erosion anti-abuse tax (“BEAT”), which is a new minimum tax, (ii) generally eliminating U.S. federal income taxes on dividends from foreign subsidiaries, (iii) adding a new provision designed to tax global intangible low taxed income (“GILTI”), (iv) adding a provision that could limit the amount of deductible interest expense, and (v) limiting the deductibility of certain executive compensation. Shortly after the Tax Act was enacted, the issued accounting guidance, which provides a one-year measurement period during which a company may complete its accounting for the impacts of the Tax Act. To the extent a company’s accounting for certain income tax effects of the Tax Act is incomplete, the company may determine a reasonable estimate for those effects and record a provisional estimate in its financial statements. If a company cannot determine a provisional estimate to be included in the financial statements, it should continue to apply the provisions of the tax laws that were in effect immediately prior to the Tax Act being enacted. During fiscal 2018, the Company recorded provisional discrete tax charges of $38.0 million related to the Tax Act. The Company adjusted its U.S. deferred tax assets by $19.0 million due to the reduction in the U.S. federal corporate tax rate. This net reduction in deferred tax assets also included the estimated impact on the Company’s net state deferred tax assets. In addition, the Company recorded a $19.0 million charge for the transition tax. The Company is in process of evaluating whether to utilize its deferred tax attributes for the transition tax. If the Company does not utilize its deferred tax attributes for the transition tax, it expects to pay the estimated $19.0 million tax liability over the next eight years, beginning with an estimated payment of $1.5 million in fiscal 2019. The Company is also awaiting additional technical guidance on the treatment of the deemed inclusion and its impact on fiscal year taxpayers. The Company is in process of analyzing other provisions of the Tax Act to determine whether they will impact the Company’s effective tax rate in the future. These provisions include BEAT, as described above, the elimination of U.S. federal income taxes on dividends from foreign subsidiaries, new limits on the deductibility of interest expense and executive compensation, and the state tax implications of the Tax Act, including the impact of the transition tax and the impact on the realizability of tax attributes and valuation allowances. The Tax Act includes a provision designed to tax GILTI, as described above, starting in fiscal 2019. The Company has elected to record the tax effects of the GILTI provision as a period expense in the applicable tax year. As a result, GILTI did not impact the Company’s fiscal 2018 income tax provision. As of March 31, 2018, the Company is still assessing the impact GILTI will have on its deferred tax attributes. The Company has not yet completed its accounting for the income tax effects of certain elements of the Tax Act. In regards to the reduction in the U.S. corporate tax rate, the Company will continue to analyze its temporary differences through finalization of the fiscal 2018 U.S. federal return. In regards to the transition tax, the Company is awaiting further interpretative guidance, continuing to assess available tax methods and elections, and continuing to gather additional information in order to more precisely compute the amount of this tax. Previously, the Company’s practice and intention was to reinvest, with certain insignificant exceptions, the earnings of its non-U.S. subsidiaries outside of the U.S. As a result, the Company did not record U.S. deferred income taxes or foreign withholding taxes for these earnings. The Company is currently analyzing its global working capital requirements and the potential tax liabilities that would be incurred if the non-U.S. subsidiaries distribute cash to the U.S. parent, which include local country withholding tax and potential U.S. state taxes. The Company expects to complete its analysis of the accounting guidance related to the Tax Act and its evaluation of the impacts of the Tax Act in first half of fiscal 2019. The Company’s accounting policy is to allocate the income tax provision between net earnings and other comprehensive income. The Company applies its accounting for income taxes by tax jurisdiction, and in periods in which there is a loss before income taxes and pre-tax income in other comprehensive income, it first allocates the income tax provision to other comprehensive income, and then records a related tax benefit in the income tax provision. The reconciliation between the U.S. federal statutory rate and the Company’s effective tax rate was as follows: Years ended March 31, 2018 2017 2016 Statutory federal tax 31.5 % 35.0 % 35.0 % State taxes, net of federal benefit 2.9 (3.3 ) 11.5 Taxes on non-U.S. earnings and losses (3.8 ) (3.5 ) 26.4 Valuation allowances (5.6 ) 1.2 (20.9 ) Tax credits (17.3 ) (9.0 ) 20.5 Compensation (0.8 ) 2.9 (3.7 ) Tax rate or law changes 60.1 (2.5 ) 1.3 Uncertain tax positions, net of settlements (0.8 ) 5.6 (4.3 ) Notional interest deductions (3.2 ) (8.8 ) - Dividend repatriation 0.2 7.1 16.0 Other (0.8 ) 3.7 8.1 Effective tax rate 62.4 % 28.4 % 89.9 % During fiscal 2018, the Company recorded provisional charges totaling $38.0 million related to the Tax Act, as discussed above, and recognized a $9.0 million Hungarian development tax credit. Also in fiscal 2018, the Company reversed a portion of the valuation allowance on certain deferred tax assets in a foreign jurisdiction after determining it was more likely than not these assets would be realized, and, as a result, recorded an income tax benefit of $2.8 million. In addition, the Company recorded a $1.8 million income tax benefit in fiscal 2018 associated with the reduction in unrecognized tax benefits resulting from a lapse in statues of limitations. During fiscal 2017, the Company recorded a valuation allowance of $2.0 million on certain deferred tax assets in a foreign jurisdiction after determining it was more likely than not the deferred tax assets would not be realized. Also during fiscal 2017, the Company recorded a net reduction of deferred tax asset valuation allowances totaling $1.8 million in other tax jurisdictions. During fiscal 2016, the Company reversed a valuation allowance of $3.0 million on certain deferred tax assets in a foreign jurisdiction after determining it was more likely than not the deferred tax assets would be realized. Also during fiscal 2016, the Company recorded a net increase in deferred tax asset valuation allowances totaling $5.0 million in other tax jurisdictions. The Company may release the valuation allowance (approximately $3.0 million) on certain deferred tax assets in a foreign jurisdiction during fiscal 2019. The Company will continue to provide valuation allowances against its net deferred tax assets in each applicable tax jurisdiction until the need for a valuation allowance is eliminated. The need for a valuation allowance is eliminated when the Company determines it is more likely than not the deferred tax assets will be realized. The tax effects of temporary differences that gave rise to deferred tax assets and liabilities were as follows: March 31, 2018 2017 Deferred tax assets: Accounts receivable $ 0.3 $ 0.4 Inventories 4.1 5.0 Plant and equipment 2.3 3.7 Pension and employee benefits 36.0 51.8 Net operating loss, capital loss, and credit carryforwards 139.2 147.5 Other, principally accrued liabilities 9.9 10.9 Total gross deferred tax assets 191.8 219.3 Less: valuation allowances (48.9 ) (49.6 ) Net deferred tax assets 142.9 169.7 Deferred tax liabilities: Plant and equipment 17.6 21.2 Goodwill 5.2 4.7 Intangible assets 32.4 43.3 Other 0.7 1.8 Total gross deferred tax liabilities 55.9 71.0 Net deferred tax assets $ 87.0 $ 98.7 Unrecognized tax benefits were as follows: Years ended March 31, 2018 2017 Beginning balance $ 14.2 $ 5.9 Gross increases - tax positions in prior period 0.8 0.3 Gross decreases - tax positions in prior period (a) (1.2 ) (0.2 ) Gross increases - due to acquisition 1.4 7.3 Gross increases - tax positions in current period 0.5 0.9 Settlements (0.3 ) - Lapse of statute of limitations (1.8 ) - Ending balance $ 13.6 $ 14.2 (a) Includes $1.0 million related to the reduction of the U.S. federal corporate tax rate as a result of the Tax Act. The Company’s liability for unrecognized tax benefits as of March 31, 2018 was $13.6 million, and if recognized, $12.1 million would have an effective tax rate impact. The Company estimates a $2.2 million decrease in unrecognized tax benefits during fiscal 2019 due to lapses in statutes of limitations and settlements. If recognized, these reductions would have a $1.6 million impact on the Company’s effective tax rate. The Company recognizes interest and penalties related to unrecognized tax benefits as a component of income tax expense. During fiscal 2018 and 2017, interest and penalties included within income tax expense in the consolidated statements of operations were not significant. At March 31, 2018 and 2017, accrued interest and penalties totaled $1.0 million and $0.8 million, respectively. The Company files income tax returns in multiple jurisdictions and is subject to examination by taxing authorities throughout the world. At March 31, 2018, the Company was under income tax examination in the United States and a number of foreign jurisdictions. The following tax years remain subject to examination for the Company’s major tax jurisdictions: Germany Fiscal 2011 - Fiscal 2017 Italy Calendar 2013 - Fiscal 2017 United States Fiscal 2015 - Fiscal 2017 At March 31, 2018, the Company had federal and state tax credits of $31.5 million that, if not utilized against U.S. taxes, will expire between fiscal 2019 and 2038. The Company also had state and local tax loss carryforwards totaling $183.1 million that, if not utilized against state apportioned taxable income, will expire between fiscal 2019 and 2038. In addition, the Company had tax loss and foreign attribute carryforwards totaling $475.0 million in various tax jurisdictions throughout the world. Certain of the carryforwards in the U.S. and in foreign jurisdictions are offset by valuation allowances. If not utilized against taxable income, $132.7 million of these carryforwards will expire between fiscal 2019 and 2038, and $342.3 million, mainly related to Germany and Italy, will not expire due to an unlimited carryforward period. Prior to the Tax Act, the Company considered substantially all earnings in its foreign subsidiaries to be permanently reinvested and recorded no provision for taxes that would be payable upon the distribution of such earnings. The Company’s current intention is to continue to permanently reinvest its undistributed earnings in its foreign operations, subject to certain insignificant exceptions, although, as discussed above, the Company has not completed its evaluation of the impacts of the Tax Act. At this time, the Company estimates the net amount of unrecognized foreign withholding tax and deferred tax liabilities would total approximately $6.0 million if the accumulated foreign earnings were distributed; however, the actual tax expense would be dependent on circumstances existing when remittance occurs.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Share	Note 8: Earnings Per Share The components of basic and diluted earnings per share were as follows: Years ended March 31, 2018 2017 2016 Basic Earnings Per Share: Net earnings (loss) attributable to Modine $ 22.2 $ 14.2 $ (1.6 ) Less: Undistributed earnings attributable to unvested shares (0.2 ) (0.2 ) - Net earnings (loss) available to Modine shareholders $ 22.0 $ 14.0 $ (1.6 ) Weighted-average shares outstanding - basic 49.9 47.8 47.3 Net earnings (loss) per share - basic $ 0.44 $ 0.29 $ (0.03 ) Diluted Earnings Per Share: Net earnings (loss) attributable to Modine $ 22.2 $ 14.2 $ (1.6 ) Less: Undistributed earnings attributable to unvested shares (0.1 ) (0.1 ) - Net earnings (loss) available to Modine shareholders $ 22.1 $ 14.1 $ (1.6 ) Weighted-average shares outstanding - basic 49.9 47.8 47.3 Effect of dilutive securities 1.0 0.5 - Weighted-average shares outstanding - diluted 50.9 48.3 47.3 Net earnings (loss) per share - diluted $ 0.43 $ 0.29 $ (0.03 ) For the years ended March 31, 2018, 2017 and 2016, the calculation of diluted earnings per share excluded 0.2 million, 0.8 million, and 0.8 million stock options, respectively, because they were anti-dilutive. For the year ended March 31, 2016, the total number of potentially-dilutive securities was 0.4 million. However, these securities were not included in the computation of diluted net loss per share since to do so would have decreased the loss per share.

Inventories

Inventories	12 Months Ended
	Mar. 31, 2018
Inventories [Abstract]
Inventories	Note 9: Inventories Inventories consisted of the following: March 31, 2018 2017 Raw materials $ 114.5 $ 100.2 Work in process 34.8 27.5 Finished goods 42.1 40.8 Total inventories $ 191.3 $ 168.5

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Mar. 31, 2018
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Note 10: Property, Plant and Equipment Property, plant and equipment, including depreciable lives, consisted of the following: March 31, 2018 2017 Land $ 22.6 $ 18.9 Buildings and improvements (10-40 years) 295.6 255.6 Machinery and equipment (3-12 years) 840.8 755.5 Office equipment (3-10 years) 93.0 92.5 Construction in progress 50.2 55.1 1,302.2 1,177.6 Less: accumulated depreciation (797.9 ) (718.6 ) Net property, plant and equipment $ 504.3 $ 459.0 Depreciation expense totaled $67.0 million, $54.2 million, and $48.6 million for the years ended March 31, 2018, 2017, and 2016, respectively. Gains and losses related to the disposal of property, plant and equipment are recorded in SG&A expenses. For the years ended March 31, 2018, 2017, and 2016, total losses related to the disposal of property, plant and equipment were $0.7 million, $0.4 million, and $0.4 million, respectively.

Investment in Affiliate

Investment in Affiliate	12 Months Ended
	Mar. 31, 2018
Investment in Affiliate [Abstract]
Investment in Affiliate	Note 11: Investment in Affiliate The Company owns 50 percent of Nikkei Heat Exchanger Company, Ltd. (“NEX”). The Company accounts for its investment in this non-consolidated affiliate using the equity method. At March 31, 2018 and 2017, the Company included its investment in NEX of $3.6 million and $3.3 million, respectively, within other noncurrent assets on the consolidated balance sheets. At March 31, 2018, the investment in NEX is equal to the Company's investment in the underlying assets. The Company reports its equity in earnings from NEX within other income and expense in the consolidated statements of operations, using a one-month reporting delay. The Company’s share of NEX’s earnings for the years ended March 31, 2018, 2017, and 2016 was $0.2 million, $0.1 million, and $0.1 million, respectively.

Intangible Assets

Intangible Assets	12 Months Ended
	Mar. 31, 2018
Intangible Assets [Abstract]
Intangible Assets	Note 12: Intangible Assets Intangible assets consisted of the following: March 31, 2018 March 31, 2017 Gross Carrying Value Accumulated Amortization Net Intangible Assets Gross Carrying Value Accumulated Amortization Net Intangible Assets Customer relationships $ 64.2 $ (5.7 ) $ 58.5 $ 60.5 $ (1.7 ) $ 58.8 Trade names 60.6 (10.8 ) 49.8 58.4 (7.2 ) 51.2 Acquired technology 25.2 (3.6 ) 21.6 27.0 (2.9 ) 24.1 Total intangible assets $ 150.0 $ (20.1 ) $ 129.9 $ 145.9 $ (11.8 ) $ 134.1 During the fourth quarter of fiscal 2018, the BHVAC segment discontinued its geothermal product line and, as a result, recorded a $1.2 million impairment charge for acquired technology intangible assets it will no longer use. Annual revenue for this discontinued product line was less than $1.0 million. The Company recorded $9.7 million, $4.1 million, and $1.6 million of amortization expense during fiscal 2018, 2017, and 2016, respectively. The Company estimates that it will record approximately $9.0 million of amortization expense in each of the next five fiscal years.

Goodwill

Goodwill	12 Months Ended
	Mar. 31, 2018
Goodwill [Abstract]
Goodwill	Note 13: Goodwill Changes in the carrying amount of goodwill, by segment and in the aggregate, were as follows: Asia BHVAC CIS Total Balance, March 31, 2016 $ 0.5 $ 15.3 $ - $ 15.8 Acquired goodwill (a) - - 150.6 150.6 Effect of exchange rate changes - (1.6 ) 0.3 (1.3 ) Balance, March 31, 2017 0.5 13.7 150.9 165.1 Acquired goodwill (a) - - 1.3 1.3 Effect of exchange rate changes - 1.3 6.1 7.4 Balance, March 31, 2018 $ 0.5 $ 15.0 $ 158.3 $ 173.8 (a) See Note 2 for additional information about the goodwill recorded as a result of the acquisition of Luvata HTS. The Company assesses goodwill for impairment annually, or more frequently if events or circumstances change that would, more likely than not, reduce the fair value of a reporting unit below its carrying value. The Company conducted its annual assessment for goodwill impairment during the fourth quarter of fiscal 2018 for its Asia, BHVAC, and CIS segments, by applying a fair value-based test, and determined that the fair value of its reporting units exceeded their respective book values. At both March 31, 2018 and 2017, accumulated goodwill impairment losses totaled $31.6 million and $8.7 million within the Americas and Europe segments, respectively.

Product Warranties, Operating L

Product Warranties, Operating Leases, and Other Commitments	12 Months Ended
	Mar. 31, 2018
Product Warranties, Operating Leases, and Other Commitments [Abstract]
Product Warranties, Operating Leases, and Other Commitments	Note 14: Product Warranties, Operating Leases, and Other Commitments Product warranties Changes in accrued warranty costs were as follows: Years ended March 31, 2018 2017 Beginning balance $ 10.0 $ 8.3 Warranties recorded at time of sale 6.7 5.2 Adjustments to pre-existing warranties (0.8 ) 0.3 Additions and adjustments due to acquisition (a) (1.0 ) 4.1 Settlements (6.2 ) (7.6 ) Effect of exchange rate changes 0.6 (0.3 ) Ending balance $ 9.3 $ 10.0 (a) During fiscal 2018, the Company decreased its liability for product warranties by $1.0 million as a result of measurement period adjustments made in connection with purchase accounting for the acquisition of Luvata HTS. See Note 2 for additional information. Operating leases: Future minimum rental commitments at March 31, 2018 under non-cancelable operating leases were as follows: Fiscal Year 2019 $ 14.4 2020 12.0 2021 10.4 2022 7.1 2023 6.6 2024 and beyond 24.6 Total $ 75.1 Indemnification agreements: Commitments:

Indebtedness

Indebtedness	12 Months Ended
	Mar. 31, 2018
Indebtedness [Abstract]
Indebtedness	Note 15: Indebtedness Long-term debt consisted of the following: Fiscal year of maturity March 31, 2018 March 31, 2017 Term Loans 2022 $ 267.8 $ 268.9 6.8% Senior Notes 2021 101.0 117.0 5.8% Senior Notes 2027 50.0 50.0 Other (a) 2032 12.8 8.3 431.6 444.2 Less: current portion (39.9 ) (31.8 ) Less: unamortized debt issuance costs (5.4 ) (6.7 ) Total long-term debt $ 386.3 $ 405.7 (a) Other long-term debt includes borrowings by foreign subsidiaries, capital lease obligations and other financing-type obligations. Long-term debt matures as follows: Fiscal Year 2019 $ 39.9 2020 47.2 2021 102.5 2022 193.9 2023 8.8 2024 & beyond 39.3 Total $ 431.6 The Company maintains an amended and restated credit agreement with a syndicate of banks that provides for both U.S. dollar- and euro-denominated term loan facilities and a multi-currency $175.0 million revolving credit facility expiring in November 2021. Based upon the terms of the credit agreement and currency denomination, borrowings under both the term loans and revolving credit facility bear interest at a variable rate, primarily either the London Interbank Offered Rate (“LIBOR”) or Euro Interbank Offered Rate (“EURIBOR”), plus 137.5 to 250 basis points depending on the Company’s leverage ratio, as described below. At March 31, 2018, the weighted-average interest rate for both the outstanding term loans and the revolving credit facility borrowings was 3.3 percent. At March 31, 2018 and 2017, the Company reported its revolving credit facility borrowings of $21.3 million and $40.4 million, respectively, as short-term debt on the consolidated balance sheets. At March 31, 2018, domestic letters of credit totaled $3.1 million, resulting in available borrowings under the Company’s revolving credit facility of $150.6 million. The Company also maintains credit agreements for its foreign subsidiaries, with outstanding short-term borrowings at March 31, 2018 and 2017 of $31.9 million and $33.0 million, respectively. At March 31, 2018, the Company’s foreign unused lines of credit totaled $19.7 million. In aggregate, the Company had total available lines of credit of $170.3 million at March 31, 2018. Provisions in the Company’s amended and restated credit agreement, Senior Note agreements, and various foreign credit agreements require the Company to maintain compliance with various covenants and include certain cross-default clauses. Under its primary debt agreements in the U.S., the Company has provided liens on substantially all domestic assets. In addition, as defined in the credit agreement, the term loans require prepayments of excess cash flows in the event our leverage ratio exceeds defined levels, or in the event of certain asset sales. The Company is also subject to leverage ratio covenants, the most restrictive of which requires the Company to limit its consolidated indebtedness, less a portion of its cash balance, both as defined by the credit agreement, to no more than three and one-quarter times consolidated net earnings before interest, taxes, depreciation, amortization, and certain other adjustments (“Adjusted EBITDA”). The Company is also subject to an interest expense coverage ratio covenant, which requires the Company to maintain Adjusted EBITDA of at least three times consolidated interest expense. The Company was in compliance with its debt covenants as of March 31, 2018. The Company estimates the fair value of long-term debt using discounted future cash flows at rates offered to the Company for similar debt instruments of comparable maturities. At March 31, 2018 and 2017, the carrying value of Modine’s long-term debt approximated fair value, with the exception of the Senior Notes, which had an aggregate fair value of approximately $153.1 million and $170.0 million, respectively. The fair value of the Senior Notes are categorized as Level 2 within the fair value hierarchy. Refer to Note 3 for the definition of a Level 2 fair value measurement.

Pension and Employee Benefit Pl

Pension and Employee Benefit Plans	12 Months Ended
	Mar. 31, 2018
Pension and Employee Benefit Plans [Abstract]
Pension and Employee Benefit Plans	Note 16: Pension and Employee Benefit Plans Defined Contribution Employee Benefit Plans: The Company maintains a domestic 401(k) plan that allows employees to contribute a portion of their salary to help them save for retirement. The Company currently matches employee contributions up to 4.5 percent of their compensation for participants. The Company’s expense for defined contribution employee benefit plans during fiscal 2018, 2017, and 2016 was $5.2 million, $4.7 million, and $4.6 million, respectively. In addition, the Company maintains non-qualified deferred compensation plans for eligible employees, and various non-U.S. subsidiaries have government-required defined contribution plans in place, under which they contribute a percentage of employee earnings into accounts, consistent with local laws. Statutory Termination Plans: Certain non-U.S. subsidiaries have statutory termination indemnity plans covering eligible employees. The benefits under these plans are based upon years of service and final average compensation levels or a monthly retirement benefit amount. These programs are all substantially unfunded in accordance with local laws, but are often covered by national obligatory umbrella insurance programs that protect employees from losses in the event that an employer defaults on its obligations. Defined Benefit Employee Benefit Plans: Pension plans: The Company contributed $13.4 million, $8.1 million, and $6.7 million to its U.S. pension plans during fiscal 2018, 2017, and 2016, respectively. In addition, the Company contributed $2.6 million, $1.4 million, and $1.2 million to its non-U.S. pension plans during fiscal 2018, 2017, and 2016, respectively. These contributions are reported in the change in other liabilities in the consolidated statements of cash flows. During fiscal 2016, in an effort to reduce the size, volatility, mortality risk, and costs associated with its U.S. pension plans, the Company offered a voluntary lump-sum payout program to certain eligible former employees. Approximately 2,000 participants accepted the lump-sum settlement offer and a total of $65.3 million was paid from pension plan assets during fiscal 2016, which reduced the Company’s pension obligation by the same amount. In connection with these lump-sum payouts, the Company recorded $42.1 million of non-cash settlement losses as other income and expense within the consolidated statement of operations related to the accelerated recognition of unamortized actuarial losses previously recorded on the consolidated balance sheets within accumulated other comprehensive loss. Postretirement plans Measurement date: Changes in benefit obligations and plan assets, as well as the funded status of the Company’s pension plans, for the fiscal years ended March 31, 2018 and 2017 were as follows: 2018 2017 Change in benefit obligation: Benefit obligation at beginning of year $ 269.8 $ 261.0 Service cost 0.5 0.6 Interest cost 9.9 9.8 Actuarial loss (gain) 4.4 (0.5 ) Benefits paid (16.9 ) (19.8 ) Curtailment gain (a) (0.3 ) - Acquired obligations (b) - 20.3 Effect of exchange rate changes 6.2 (1.6 ) Benefit obligation at end of year $ 273.6 $ 269.8 Change in plan assets: Fair value of plan assets at beginning of year $ 148.2 $ 141.5 Actual return on plan assets 10.4 11.0 Benefits paid (16.9 ) (19.8 ) Employer contributions 16.0 9.5 Acquired plan assets (b) - 6.0 Fair value of plan assets at end of year $ 157.7 $ 148.2 Funded status at end of year $ (115.9 ) $ (121.6 ) Amounts recognized in the consolidated balance sheets: Current liability $ (6.3 ) $ (2.2 ) Noncurrent liability (109.6 ) (119.4 ) $ (115.9 ) $ (121.6 ) (a) During the third quarter of fiscal 2018, the Company recorded a pension curtailment gain associated with the closure of a manufacturing facility in Austria (CIS segment). See Note 5 for additional information regarding the closure of this facility. (b) In fiscal 2017, as a result of its acquisition of Luvata HTS, the Company acquired pension plans in Italy, Austria and the U.S. See Note 2 for additional information regarding this acquisition. The accumulated benefit obligation for pension plans was $271.8 million and $266.8 million as of March 31, 2018 and 2017, respectively. The net actuarial loss related to the pension plans recognized in accumulated other comprehensive loss was $157.9 million and $156.8 million as of March 31, 2018 and 2017, respectively. Costs for the Company’s pension plans included the following components for the fiscal years ended March 31, 2018, 2017, and 2016: 2018 2017 2016 Components of net periodic benefit cost: Service cost $ 0.5 $ 0.6 $ 0.6 Interest cost 9.9 9.8 11.2 Expected return on plan assets (11.9 ) (12.3 ) (14.9 ) Amortization of net actuarial loss 5.6 5.6 6.4 Settlements (a) 0.3 - 42.1 Curtailment gain (b) (0.3 ) - - Net periodic benefit cost $ 4.1 $ 3.7 $ 45.4 Other changes in benefit obligation recognized in other comprehensive income (loss): Net actuarial loss $ (5.8 ) $ (1.0 ) $ (17.5 ) Amortization of net actuarial loss (a) 5.9 5.6 48.5 Total recognized in other comprehensive income (loss) $ 0.1 $ 4.6 $ 31.0 (a) During fiscal 2016, in connection with lump-sum payouts to pension plan participants, the Company recorded $42.1 million of settlement losses, which were previously recorded in accumulated other comprehensive loss. (b) During the third quarter of fiscal 2018, the Company recorded a pension curtailment gain associated with the closure of a manufacturing facility in Austria (CIS segment). See Note 5 for additional information regarding the closure of this facility. The Company estimates $5.6 million of net actuarial loss for its pension plans will be amortized from accumulated other comprehensive loss into net periodic benefit cost during fiscal 2019. The Company used a discount rate of 4.0% and 4.1% as of March 31, 2018 and 2017, respectively, for determining its benefit obligations under its U.S. pension plans. The Company used a weighted-average discount rate of 1.7% as of both March 31, 2018 and 2017, for determining its benefit obligations under its non-U.S. pension plans. The Company used a discount rate of 4.1%, 4.1%, and 4.3% to determine its costs under its U.S. pension plans for fiscal 2018, 2017, and 2016, respectively. The Company used a weighted-average discount rate of 1.9%, 1.7%, and 1.3% to determine its costs under its non-U.S. pension plans for fiscal 2018, 2017, and 2016, respectively. The Company determined the discount rates used for its U.S. pension plans by modeling a portfolio of high-quality corporate bonds, with appropriate consideration given to expected defined benefit payment terms and duration of the respective pension obligations. The Company used a similar process to determine the discount rate for its non-U.S. pension obligations. Plan assets in the Company’s U.S. pension plans comprise 100 percent of the Company’s world-wide pension plan assets. The Company’s U.S. pension plan weighted-average asset allocations at the measurement dates of March 31, 2018 and 2017 were as follows: Target allocation as of March 31, 2018 Plan assets 2018 2017 Equity securities 60 % 58 % 58 % Debt securities 38 % 38 % 38 % Cash and cash equivalents 2 % 4 % 4 % 100 % 100 % 100 % Due to market conditions and other factors, including timing of benefit payments and other transactions, actual asset allocation may vary from the target allocation outlined above. The Company periodically rebalances the assets to the target allocations. As of March 31, 2018 and 2017, the Company’s pension plans did not directly own shares of Modine common stock. The Company employs a total return investment approach, whereby a mix of equities and fixed-income investments are used to maximize the long-term return of plan assets, while avoiding excessive risk. The Company has established pension plan guidelines based upon an evaluation of market conditions, tolerance for risk and cash requirements for benefit payments. The Company measures and monitors investment risk on an ongoing basis through quarterly investment portfolio reviews, annual liability measurements and periodic asset/liability studies. The expected rate of return on U.S. plan assets is based upon historical return experience and forward-looking return expectations for major asset class categories. For fiscal 2018, 2017, and 2016 U.S. pension plan expense, the expected rate of return on plan assets was 7.5 percent, 8.0 percent and 8.0 percent, respectively. For fiscal 2019 U.S. pension plan expense, the Company has assumed a rate of return on plan assets of 7.5 percent. The Company’s funding policy for its U.S. pension plans is to contribute annually, at a minimum, the amount necessary on an actuarial basis to provide for benefits in accordance with applicable laws and regulations. The Company expects to make contributions of approximately $6.0 million to these plans during fiscal 2019. Estimated pension benefit payments for the next ten fiscal years are as follows: Fiscal Year Estimated Pension Benefit Payments 2019 $ 20.4 2020 16.5 2021 17.0 2022 17.2 2023 17.4 2024-2028 85.2

Derivative Instruments

Derivative Instruments	12 Months Ended
	Mar. 31, 2018
Derivative Instruments [Abstract]
Derivative Instruments	Note 17: Derivative Instruments The Company uses derivative financial instruments from time to time as a tool to manage certain financial risks. The Company’s policy prohibits the use of leveraged derivatives. Accounting for derivatives and hedging activities requires derivative financial instruments to be measured at fair value and recognized as assets or liabilities in the consolidated balance sheets. Accounting for the gain or loss resulting from the change in fair value of the derivative financial instruments depends on whether it has been designated as a hedge, and, if so, on the nature of the hedging activity. Commodity derivatives: Foreign exchange contracts: The fair value of the Company’s derivative financial instruments recorded in the consolidated balance sheets were as follows: Balance Sheet Location March 31, 2018 March 31, 2017 Derivatives designated as hedges: Commodity derivatives Other current assets $ 0.1 $ - Foreign exchange contracts Other current assets 0.1 - Derivatives not designated as hedges: Commodity derivatives Other current assets $ - $ 0.7 Commodity derivatives Other current liabilities 0.2 - Foreign exchange contracts Other current assets 0.2 0.2 Foreign exchange contracts Other current liabilities 0.6 - The amounts recorded during fiscal 2018 in the consolidated financial statements resulting from gains or losses on the Company’s designated derivative financial instruments were not material. In fiscal 2018, the Company recorded gains for designated commodity and foreign exchange contracts totaling $0.2 million and $0.1 million, respectively, in other comprehensive income (loss). The Company subsequently reclassified $0.1 million of gains from foreign exchange contracts to net sales in the consolidated statement of operations. The amounts recorded in the consolidated statements of operations for the Company’s non-designated derivative financial instruments were as follows: Years ended March 31, Statement of Operations Location 2018 2017 2016 Commodity derivatives Cost of sales $ 0.4 $ 0.5 $ (0.7 ) Foreign exchange contracts Net sales (0.1 ) - - Foreign exchange contracts Other income (expense) - net (0.5 ) 1.3 0.6 Total gains (losses) $ (0.2 ) $ 1.8 $ (0.1 )

Contingencies and Litigation

Contingencies and Litigation	12 Months Ended
	Mar. 31, 2018
Contingencies and Litigation [Abstract]
Contingencies and Litigation	Note 18: Contingencies and Litigation Market Risk The Company sells a broad range of products that provide thermal solutions to customers operating primarily in the automotive, commercial vehicle, off-highway, and commercial, industrial, and building HVAC&R markets. The Company operates in diversified markets as a strategy for offsetting the risk associated with a downturn in any one or more of the markets it serves. The Company pursues new market opportunities after careful consideration of the potential associated risks and benefits. However, the risk associated with market downturns is still present. Credit Risk The Company invests excess cash primarily in investment quality, short-term liquid debt instruments. Financial instruments that potentially subject the Company to significant concentrations of credit risk consist principally of accounts receivable. The Company sells a broad range of products that provide thermal solutions to customers operating throughout the world. In fiscal 2018, 2017, and 2016, two customers each accounted for ten percent or more of the Company’s total sales. Sales to the Company’s top ten customers were 48 percent, 54 percent, and 63 percent of total sales in fiscal 2018, 2017, and 2016, respectively. At March 31, 2018 and 2017, 36 percent and 35 percent, respectively, of the Company's trade accounts receivable were due from the Company's top ten customers. These customers operate primarily in the automotive, commercial vehicle and off-highway markets, which are influenced by similar market and general economic factors, as well as the commercial air conditioning markets. Collateral or advanced payments are generally not required. The Company has not experienced significant credit losses to customers in the markets served. The Company manages credit risk through its focus on the following: · Cash and investments – reviewing cash deposits and short-term investments to ensure banks have credit ratings acceptable to the Company and that short-term investments are maintained in secured or guaranteed instruments; · Accounts receivable – performing periodic customer credit evaluations and actively monitoring their financial condition and applicable business news; · Pension assets – ensuring that investments within pension plans provide appropriate diversification, monitoring of investment teams, ensuring that portfolio managers adhere to the Company’s investment policies and directives, and ensuring that exposure to high risk investments is limited; and · Insurance – ensuring that insurance providers maintain acceptable financial ratings. Counterparty Risk The Company manages counterparty risk through its focus on the following: · Customers – performing thorough reviews of customer credit reports and accounts receivable aging reports by internal credit committees; · Suppliers – maintaining a supplier risk management program and utilizing industry sources to identify and mitigate high risk situations; and · Derivatives – ensuring that counterparties to derivative instruments maintain credit ratings that are acceptable to the Company. Environmental The Company has recorded environmental investigation and remediation accruals related to soil and groundwater contamination at two manufacturing facilities in the United States, one of which the Company no longer owns, and at its former manufacturing facility in the Netherlands, along with accruals for lesser environmental matters at certain other facilities in the United States and Brazil. These accruals generally relate to facilities where past operations followed practices and procedures that were considered acceptable under then-existing regulations, or where the Company is a successor to the obligations of prior owners, and current laws and regulations require investigative and/or remedial work to ensure sufficient environmental compliance. The accruals for these environmental matters totaled $16.7 million and $16.8 million at March 31, 2018 and 2017, respectively. As additional information becomes available, the Company will re-assess the liabilities related to these matters and revise the estimated accruals, if necessary. Based upon currently available information, the Company believes the ultimate outcome of these matters, individually and in the aggregate, will not have a material adverse effect on its financial position. However, these matters are subject to inherent uncertainties, and unfavorable outcomes could occur, including significant monetary damages. Brazil Antitrust Investigation As of March 31, 2017, the Company accrued $4.7 million related to alleged violations of Brazil’s antitrust regulations. During fiscal 2018, the Company paid $4.7 million to Brazil’s Administrative Council for Economic Defense to settle this matter. Other Litigation In the normal course of business, the Company and its subsidiaries are named as defendants in various lawsuits and enforcement proceedings by private parties, governmental agencies and/or others in which claims are asserted against Modine. In the opinion of management, the liabilities, if any, which may ultimately result from such lawsuits or proceedings are not expected to have a material adverse effect on the Company’s financial position.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	12 Months Ended
	Mar. 31, 2018
Accumulated Other Comprehensive Loss [Abstract]
Accumulated Other Comprehensive Loss	Note 19: Accumulated Other Comprehensive Loss Changes in accumulated other comprehensive loss were as follows: Foreign Currency Translation Defined Benefit Plans Cash Flow Hedges Total Balance, March 31, 2017 $ (46.8 ) $ (135.0 ) $ - $ (181.8 ) Other comprehensive income (loss) before reclassifications 41.3 (5.7 ) 0.3 35.9 Reclassifications for amortization of unrecognized net loss (a) - 5.6 - 5.6 Reclassifications of realized gains (b) - - (0.1 ) (0.1 ) Income taxes - 0.2 (0.1 ) 0.1 Total other comprehensive income 41.3 0.1 0.1 41.5 Balance, March 31, 2018 $ (5.5 ) $ (134.9 ) $ 0.1 $ (140.3 ) Foreign Currency Translation Defined Benefit Plans Total Balance, March 31, 2016 $ (36.0 ) $ (138.2 ) $ (174.2 ) Other comprehensive income (loss) before reclassifications (10.8 ) (0.3 ) (11.1 ) Reclassifications for amortization of unrecognized net loss (a) - 5.2 5.2 Income taxes - (1.7 ) (1.7 ) Total other comprehensive income (loss) (10.8 ) 3.2 (7.6 ) Balance, March 31, 2017 $ (46.8 ) $ (135.0 ) $ (181.8 ) (a) Amounts are included in the calculation of net periodic benefit cost for the Company’s defined benefit plans, which include pension and other postretirement plans. See Note 16 for additional information about the Company’s pension plans. (b) Amounts reclassified to net earnings. See Note 17 for additional information regarding derivative instruments.

Segment and Geographic Informat

Segment and Geographic Information	12 Months Ended
	Mar. 31, 2018
Segment and Geographic Information [Abstract]
Segment and Geographic Information	Note 20: Segment and Geographic Information The Company’s product lines consist of heat-transfer components and systems. The Company serves vehicular and commercial, industrial, and building HVAC&R markets. In November 2016, the Company acquired Luvata HTS and, commencing from the acquisition date, has operated and reported results for the acquired business as its CIS segment. See Note 2 for additional information regarding the Luvata HTS acquisition. The Company’s Americas, Europe, and Asia segments represent its vehicular businesses and primarily serve the automotive, commercial vehicle, and off-highway markets. In addition, the Americas segment serves the automotive and commercial vehicle aftermarket in Brazil and provides coils to the commercial HVAC&R market in North America. The Company’s CIS segment provides coils, coolers, and coating solutions to customers throughout the world. The Company’s BHVAC segment provides heating, ventilating and air conditioning products to customers throughout the world. Each operating segment is managed by a vice president and has separate financial results reviewed by the Company’s chief operating decision maker. These results are used by management in evaluating the performance of each segment and in making decisions on the allocation of resources among the Company’s various businesses. Effective April 1, 2018, the Company combined its Americas, Europe, and Asia segment operations with the objective of operating as a more global, product-based organization. As part of this segment combination and its CIS integration activities, the Company also merged its Americas coils business into the CIS segment and expects to achieve operational improvements and organizational efficiencies as a result. Beginning for fiscal 2019, the Company will report financial results for the new Vehicular Thermal Solutions segment, which will include the current Americas, Europe and Asia segments. The following is a summary of net sales, gross profit, and operating income by segment: Years ended March 31, Net sales: 2018 2017 2016 Americas $ 580.7 $ 534.0 $ 585.5 Europe 568.3 524.3 524.1 Asia 165.8 111.5 79.0 CIS 620.0 177.7 - BHVAC 191.2 171.6 181.4 Segment total 2,126.0 1,519.1 1,370.0 Corporate and eliminations (22.9 ) (16.1 ) (17.5 ) Net sales $ 2,103.1 $ 1,503.0 $ 1,352.5 Years ended March 31, 2018 2017 2016 Gross profit: $'s % of sales $'s % of sales $'s % of sales Americas $ 91.9 15.8 % $ 87.0 16.3 % $ 100.3 17.1 % Europe 83.8 14.7 % 81.6 15.6 % 69.5 13.3 % Asia 30.3 18.3 % 18.7 16.8 % 12.2 15.5 % CIS 92.1 14.9 % 26.0 14.6 % - - BHVAC 58.0 30.3 % 47.8 27.8 % 54.2 29.9 % Segment total 356.1 16.8 % 261.1 17.2 % 236.2 17.2 % Corporate and eliminations (a) 0.4 - (6.7 ) - (2.6 ) - Gross profit $ 356.5 17.0 % $ 254.4 16.9 % $ 233.6 17.3 % Years ended March 31, Operating income: 2018 2017 2016 Americas $ 38.2 $ 27.9 $ 36.9 Europe 33.6 38.2 14.7 Asia 17.6 7.7 0.8 CIS 25.8 7.5 - BHVAC 20.3 13.2 13.9 Segment total 135.5 94.5 66.3 Corporate and eliminations (a) (43.3 ) (52.2 ) (29.2 ) Operating income $ 92.2 $ 42.3 $ 37.1 (a) During fiscal 2018 and 2017, the Company recorded $4.3 million and $14.8 million, respectively, of costs incurred directly related to the acquisition and integration of Luvata HTS within SG&A expenses at Corporate. During fiscal 2017, the Company recorded $4.3 million in cost of sales related to an inventory purchase accounting adjustment at Corporate, as the impact was excluded from the Company’s measure of segment operating performance. Inter-segment sales are accounted for based upon an established markup over production costs. Net sales for Corporate and eliminations primarily represent the elimination of inter-segment sales. The operating loss for Corporate includes certain research and development costs, legal, finance and other general corporate and central services expenses, and other costs that are either not directly attributable to an operating segment or not considered when management evaluates segment performance. The following is a summary of total assets by segment: March 31, 2018 2017 Americas $ 290.6 $ 282.9 Europe 324.0 269.4 Asia 144.5 111.3 CIS 630.0 576.0 BHVAC 88.1 85.2 Corporate and eliminations (a) 96.2 124.7 Total assets $ 1,573.4 $ 1,449.5 (a) The decrease in total assets at Corporate was primarily due to a decrease in deferred tax assets resulting from the impact of tax reform in the U.S. See Note 7 for additional information regarding the reduction in the corporate tax rate in the U.S. The following is a summary of capital expenditures and depreciation and amortization expense by segment: Years ended March 31, Capital expenditures: 2018 2017 2016 Americas $ 22.2 $ 26.3 $ 26.7 Europe 26.8 24.7 24.8 Asia 12.4 8.5 6.2 CIS 9.0 3.4 - BHVAC 0.6 1.5 5.1 Total capital expenditures $ 71.0 $ 64.4 $ 62.8 Years ended March 31, Depreciation and amortization expense: 2018 2017 2016 Americas $ 22.2 $ 22.7 $ 22.1 Europe 18.4 16.5 18.0 Asia 7.6 7.0 6.5 CIS 24.3 7.9 - BHVAC 4.2 4.2 3.6 Total depreciation and amortization expense $ 76.7 $ 58.3 $ 50.2 The following is a summary of net sales by geographical area, based upon the location of the selling unit: Years ended March 31, 2018 2017 2016 United States $ 911.4 $ 657.8 $ 627.6 Italy 211.5 94.4 44.1 China 156.0 73.7 29.3 Hungary 153.9 145.6 145.9 Austria 151.7 125.2 113.1 Germany 132.6 130.1 155.3 Other 386.0 276.2 237.2 Net sales $ 2,103.1 $ 1,503.0 $ 1,352.5 The following is a summary of property, plant and equipment by geographical area: March 31, 2018 2017 United States $ 121.5 $ 124.7 Italy 62.0 55.8 Hungary 59.3 37.7 China 49.6 40.0 Mexico 49.4 47.0 Austria 42.8 44.3 Germany 37.2 28.9 Other 82.5 80.6 Total property, plant and equipment $ 504.3 $ 459.0 The following is a summary of net sales by end market: Years ended March 31, 2018 2017 2016 Automotive $ 526.0 $ 461.0 $ 396.8 Commercial vehicle 381.7 382.5 459.8 Off-highway 271.2 202.8 206.2 Other vehicular 61.9 55.8 57.6 Commercial & residential air conditioning 371.3 136.5 48.8 Commercial refrigeration 158.7 52.2 - Other HVAC&R 332.3 212.2 183.3 Net sales $ 2,103.1 $ 1,503.0 $ 1,352.5

Quarterly Financial Data (Unaud

Quarterly Financial Data (Unaudited)	12 Months Ended
	Mar. 31, 2018
Quarterly Financial Data (Unaudited) [Abstract]
Quarterly Financial Data (Unaudited)	Note 21: Quarterly Financial Data (Unaudited) Quarterly financial data is summarized below for the years ended March 31, 2018 and 2017: Fiscal 2018 quarters ended June Sept. Dec. March Fiscal 2018 Net sales $ 515.5 $ 508.3 $ 512.7 $ 566.6 $ 2,103.1 Gross profit 88.5 86.1 85.4 96.5 356.5 Net earnings (loss) (a) 17.4 16.3 (27.9 ) 18.0 23.8 Net earnings (loss) attributable to Modine (a) 17.0 15.9 (28.3 ) 17.6 22.2 Net earnings (loss) per share attributable to Modine shareholders: Basic $ 0.34 $ 0.32 $ (0.57 ) $ 0.35 $ 0.44 Diluted 0.34 0.31 (0.57 ) 0.34 0.43 Fiscal 2017 quarters ended June Sept. Dec. March Fiscal 2017 Net sales $ 347.2 $ 317.7 $ 349.8 $ 488.3 $ 1,503.0 Gross profit 62.3 48.0 59.0 85.1 254.4 Net earnings (loss) (b) 8.9 (4.0 ) 1.9 8.1 14.9 Net earnings (loss) attributable to Modine (b) 8.6 (4.1 ) 1.7 8.0 14.2 Net earnings (loss) per share attributable to Modine shareholders: Basic $ 0.18 $ (0.09 ) $ 0.04 $ 0.16 $ 0.29 Diluted 0.18 (0.09 ) 0.04 0.16 0.29 (a) During fiscal 2018, restructuring expenses totaled $1.7 million, $0.4 million, $9.4 million, and $4.5 million for the quarters ended June 30, 2017, September 30, 2017, December 31, 2017, and March 31, 2018, respectively (see Note 5). During the third quarter of fiscal 2018, the Company recorded a $1.3 million asset impairment charge related to a manufacturing facility in Austria (see Note 5). During the fourth quarter of fiscal 2018, the Company recorded a $1.2 million impairment charge related to intangible assets (see Note 12). During fiscal 2018, costs directly related to the acquisition and integration of Luvata HTS totaled $1.6 million, $1.1 million, $1.0 million, and $0.6 million for the quarters ended June 30, 2017, September 30, 2017, December 31, 2017, and March 31, 2018, respectively (see Note 2). The Company recorded charges totaling $35.7 million and $2.3 million resulting for certain income tax effects of recently-enacted U.S. tax legislation in the quarters ended December 31, 2017 and March 31, 2018, respectively (see Note 7). During the fourth quarter of fiscal 2018, the Company reversed a portion of a valuation allowance related to a foreign tax jurisdiction, and, as a result, recorded an income tax benefit of $2.8 million (see Note 7). (b) During fiscal 2017, restructuring expenses totaled $2.3 million, $2.1 million, $1.6 million, and $4.9 million for the quarters ended June 30, 2016, September 30, 2016, December 31, 2016, and March 31, 2017, respectively (see Note 5). During fiscal 2017, the Company sold two previously-closed manufacturing facilities in its Americas segment and a facility in its Europe segment and recognized net gains totaling $1.2 million and $0.8 million in the quarters ended September 30, 2016 and March 31, 2017, respectively. During fiscal 2017, costs directly related to the acquisition and integration of Luvata HTS totaled $1.4 million, $3.0 million, $7.2 million, and $3.2 million for the quarters ended June 30, 2016, September 30, 2016, December 31, 2016, and March 31, 2017, respectively (see Note 2). During the fourth quarter of fiscal 2017, the Company recorded a deferred tax valuation allowance related to a foreign tax jurisdiction, and, as a result, recorded income tax expense of $2.0 million (see Note 7).

SCHEDULE II - VALUATION AND QUA

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS	12 Months Ended
	Mar. 31, 2018
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS [Abstract]
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS	SCHEDULE II ‑ VALUATION AND QUALIFYING ACCOUNTS For the years ended March 31, 2018, 2017 and 2016 (In millions) Additions Description Balance at Beginning of Period Charged (Benefit) to Costs and Expenses Charged to Other Accounts Balance at End of Period 2018: Valuation Allowance for Deferred Tax Assets $ 49.6 $ (6.7 ) $ 6.0 (a) $ 48.9 2017: Valuation Allowance for Deferred Tax Assets $ 50.8 $ (0.3 ) $ (0.9 ) (a) $ 49.6 2016: Valuation Allowance for Deferred Tax Assets $ 48.0 $ 1.5 $ 1.3 (a) $ 50.8 Notes: (a) Foreign currency translation, increases due to the acquisition of Luvata HTS and other adjustments

Significant Accounting Polici31

Significant Accounting Policies (Policies)	12 Months Ended
	Mar. 31, 2018
Significant Accounting Policies [Abstract]
Nature of Operations	Nature of operations:
Acquisition of Luvata HTS	Acquisition of Luvata HTS:
Basis of presentation	Basis of presentation:
Consolidation principles	Consolidation principles: The Company accounts for investments in non-consolidated affiliated companies in which its ownership is 20 percent or more using the equity method. The Company states these investments at cost, plus or minus a proportionate share of undistributed net earnings. The Company includes Modine’s share of the affiliate’s net earnings in other income and expense. See Note 11 for additional information.
Airedale facility fire	Airedale facility fire:
Revenue recognition	Revenue recognition:
Tooling costs	Tooling costs:
Warranty	Warranty:
Shipping and handling costs	Shipping and handling costs:
Stock-based compensation	Stock-based compensation:
Research and development	Research and development:
Translation of foreign currencies	Translation of foreign currencies:
Derivative instruments	Derivative instruments:
Income taxes	Income taxes:
Earnings per share	Earnings per share:
Cash and cash equivalents	Cash and cash equivalents:
Short-term investments	Short-term investments:
Trade accounts receivable	Trade accounts receivable:
Inventories	Inventories:
Property, plant and equipment	Property, plant and equipment
Goodwill	Goodwill:
Impairment of long-lived assets	Impairment of long-lived assets:
Assets held for sale	Assets held for sale:
Deferred compensation trusts	Deferred compensation trusts:
Self-insurance reserves	Self-insurance reserves:
Environmental liabilities	Environmental liabilities:
New Accounting Guidance	New Accounting Guidance: Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income In February 2018, the Financial Accounting Standards Board (“FASB”) issued new guidance related to the accounting for certain stranded income tax effects in accumulated other comprehensive income (loss) resulting from tax reform legislation that was enacted in the U.S. in December 2017. This guidance provides companies with the option to reclassify stranded income tax effects to retained earnings and will be effective for the Company’s first quarter of fiscal 2020. The Company is currently evaluating the impact this guidance will have on its consolidated financial statements. Derivatives and Hedging In August 2017, the FASB issued new guidance related to hedge accounting. The main objectives of the new guidance include aligning hedge accounting with the companies’ risk management strategies and increasing disclosure transparency regarding both the scope and the results of hedging programs. The Company early adopted the new guidance in the third quarter of fiscal 2018. This new guidance did not have a material impact on the Company’s consolidated financial statements. Pension Costs In March 2017, the FASB issued new guidance related to the income statement presentation of pension and postretirement costs. This guidance requires companies to continue to present the service cost component of net periodic benefit cost within the same financial statement line item as other employee compensation costs; however, other components of net benefit cost are required to be presented outside of results from operations. The Company adopted this guidance, on a retrospective basis, in fiscal 2018. As a result, the Company recorded $3.3 million of net periodic benefit cost within other income and expense for the fiscal year ended March 31, 2018 and reclassified the net periodic benefit cost, exclusive of service cost, to other income and expense for the prior-year periods. For fiscal 2017 and 2016, the Company reclassified net periodic benefit cost totaling $2.9 million ($1.1 million from cost of sales and $1.8 million from SG&A expenses) and $44.6 million ($10.1 million from cost of sales and $34.5 million from SG&A expenses), respectively, to other income and expense. Income Taxes: Intra-Entity Transfers of Assets Other Than Inventory In October 2016, the FASB issued new guidance related to income tax accounting for intercompany asset transfers. This new guidance requires companies to recognize the income tax effects of intercompany asset transfers other than inventory at the transaction date. The income tax effects of these transfers were previously deferred. This new guidance is effective for the Company’s first quarter of fiscal 2019. As a result of adopting this new guidance using the modified-retrospective transition method, the Company expects to record a decrease to retained earnings of approximately $8.0 million as of April 1, 2018. Stock-based Compensation In March 2016, the FASB issued new guidance to simplify several aspects of accounting for stock-based payment transactions. The Company adopted this guidance beginning in its first quarter of fiscal 2018. The Company elected to account for forfeitures in the period in which they occur and recorded a cumulative-effect adjustment to equity. In addition, the Company prospectively adopted the guidance requiring all excess tax benefits or deficiencies to be recognized as income tax expense or benefit when share-based awards are settled. The provisions of this guidance did not have a material impact on the Company's consolidated financial statements. As a result of adopting this new guidance, the Company recorded a $0.4 million increase to both deferred tax assets and equity as of April 1, 2017. Leases In February 2016, the FASB issued new comprehensive lease accounting guidance that supersedes existing lease accounting guidance. Upon adoption of this new guidance, the Company will be required to recognize most leases on its balance sheet. This guidance is effective for the Company’s first quarter of fiscal 2020. The Company is currently evaluating the impact this guidance will have on its consolidated financial statements. Revenue Recognition In May 2014, the FASB issued new guidance that outlines a comprehensive model for entities to use in accounting for revenue arising from contracts with customers. The core principle of the new guidance is that companies are to recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The new guidance also includes a cohesive set of disclosure requirements intended to provide users of financial statements with comprehensive information about revenue arising from contracts with customers. This new guidance is effective for the Company’s first quarter of fiscal 2019, and the Company plans to adopt it using a modified-retrospective transition method. The Company will recognize the cumulative effect of initially applying the standard as an adjustment to retained earnings. The Company has assessed customer contracts and evaluated contractual provisions in light of the new guidance. Under current guidance, the Company generally recognizes revenue when products are shipped and risk of loss has transferred to the customer. Through its evaluation process, the Company has identified a limited number of customer contracts that provide an enforceable right to payment for customized products, which will require revenue recognition prior to the product being shipped to the customer. In addition, the Company has evaluated pricing provisions contained in certain of its customer contracts to determine the appropriate amount and timing of revenue recognized based upon the new guidance. As a result of its adoption of the new guidance, the Company expects to record an increase of less than $1.0 million to retained earnings as of April 1, 2018, along with related balance sheet reclassifications. The expected increase to retained earnings reflects approximately $3.0 million of net sales that, had the new guidance been in effect, the Company would have recognized as of March 31, 2018. The Company is still assessing the enhanced disclosure requirements of the new guidance. Supplemental cash flow information: Years ended March 31, 2018 2017 2016 Interest paid $ 23.4 $ 15.4 $ 10.7 Income taxes paid 20.1 12.7 10.1

Significant Accounting Polici32

Significant Accounting Policies (Tables)	12 Months Ended
	Mar. 31, 2018
Significant Accounting Policies [Abstract]
Supplemental cash flow information	Supplemental cash flow information: Years ended March 31, 2018 2017 2016 Interest paid $ 23.4 $ 15.4 $ 10.7 Income taxes paid 20.1 12.7 10.1

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Mar. 31, 2018
Acquisitions [Abstract]
Allocation of purchase price	The Company’s allocation of the purchase price for its acquisition of Luvata HTS was as follows: Cash and cash equivalents $ 27.4 Trade accounts receivable 86.1 Inventories 55.0 Property, plant and equipment 120.4 Intangible assets 130.2 Goodwill 151.9 Other assets 39.1 Accounts payable (73.7 ) Accrued compensation and employee benefits (24.3 ) Deferred income taxes (39.5 ) Pensions (14.3 ) Other liabilities (42.7 ) Purchase price $ 415.6
Acquired intangible assets	Acquired intangible assets were as follows: Gross Weighted- Customer relationships $ 58.4 17 years Trade names 50.1 20 years Acquired technology 21.7 12 years Total intangible assets acquired $ 130.2
Supplemental proforma information	This pro forma financial information is presented for illustrative purposes only and is not considered to be indicative of the operating results that would have been achieved had the acquisition been completed as of the date indicated. Years ended March 31, 2017 2016 Net sales $ 1,881.6 $ 1,871.9 Net earnings attributable to Modine 35.8 1.5 Net earnings per share attributable to Modine shareholders: Basic $ 0.72 $ 0.03 Diluted 0.71 0.03

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Mar. 31, 2018
Fair Value Measurements [Abstract]
Schedule of U.S. pension plan assets fair value	Plan assets related to the Company’s pension plans were classified as follows: March 31, 2018 Level 1 Level 2 Total Money market investments $ - $ 11.4 $ 11.4 Common stocks 9.4 2.6 12.0 Corporate bonds - 9.7 9.7 Pooled equity funds 64.4 - 64.4 Pooled fixed-income funds 27.3 - 27.3 U.S. government and agency securities - 16.2 16.2 Other 0.2 1.7 1.9 Fair value excluding investment measured at net asset value 101.3 41.6 142.9 Investment measured at net asset value (a) 14.8 Total Fair Value $ 157.7 March 31, 2017 Level 1 Level 2 Total Money market investments $ - $ 5.6 $ 5.6 Common stocks 17.8 2.0 19.8 Corporate bonds - 9.3 9.3 Pooled equity funds 56.8 - 56.8 Pooled fixed-income funds 26.5 - 26.5 U.S. government and agency securities - 18.7 18.7 Other 1.4 1.4 2.8 Fair value excluding investment measured at net asset value 102.5 37.0 139.5 Investment measured at net asset value (a) 8.7 Total Fair Value $ 148.2 (a) As a practical expedient, the Company valued a collective trust fund using its net asset value per unit, and therefore, has not classified this investment within the fair value hierarchy.

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Mar. 31, 2018
Stock-Based Compensation [Abstract]
Assumptions used in determining fair value of options	The Company estimated the fair value of option awards on the date of grant using the Black-Scholes option valuation model and the following assumptions: Years ended March 31, 2018 2017 2016 Fair value of options $ 7.30 $ 4.60 $ 7.11 Expected life of awards in years 6.4 6.4 6.3 Risk-free interest rate 1.9 % 1.4 % 1.9 % Expected volatility of the Company's stock 44.3 % 45.5 % 66.9 % Expected dividend yield on the Company's stock 0.0 % 0.0 % 0.0 %
Summary of the stock option activity	A summary of stock option activity for fiscal 2018 was as follows: Shares Weighted-average exercise price Weighted-average remaining contractual term (years) Aggregate intrinsic value Outstanding, beginning 1.5 $ 9.83 Granted 0.2 15.90 Exercised (0.4 ) 8.89 Forfeited or expired (0.1 ) 12.64 Outstanding, ending 1.2 $ 11.16 6.1 $ 12.2 Exercisable, March 31, 2018 0.7 $ 9.99 4.6 $ 8.0
Information related to stock options exercised	Additional information related to stock options exercised is as follows: Years ended March 31, 2018 2017 2016 Intrinsic value of stock options exercised $ 4.9 $ 0.5 $ 0.4 Proceeds from stock options exercised $ 4.3 $ 0.9 $ 0.5
Summary of the restricted stock activity	A summary of restricted stock activity for fiscal 2018 was as follows: Shares Weighted- Non-vested balance, beginning 0.6 $ 11.21 Granted 0.3 16.12 Vested (0.3 ) 12.56 Non-vested balance, ending 0.6 $ 12.24

Restructuring Activities (Table

Restructuring Activities (Tables)	12 Months Ended
	Mar. 31, 2018
Restructuring Activities [Abstract]
Restructuring and repositioning expenses	Restructuring and repositioning expenses were as follows: Years ended March 31, 2018 2017 2016 Employee severance and related benefits $ 13.0 $ 5.3 $ 12.8 Other restructuring and repositioning expenses 3.0 5.6 3.8 Total $ 16.0 $ 10.9 $ 16.6
Changes in accrued severance	Changes in accrued severance were as follows: Years ended March 31, 2018 2017 Beginning balance $ 6.5 $ 14.7 Additions 13.0 5.3 Payments (9.4 ) (12.9 ) Effect of exchange rate changes 0.9 (0.6 ) Ending balance $ 11.0 $ 6.5

Other Income and Expense (Table

Other Income and Expense (Tables)	12 Months Ended
	Mar. 31, 2018
Other Income and Expense [Abstract]
Other income and expense	Other income and expense consisted of the following: Years ended March 31, 2018 2017 2016 Equity in earnings of non-consolidated affiliate $ 0.2 $ 0.1 $ 0.1 Interest income 0.4 0.4 0.4 Foreign currency transactions (a) (0.6 ) (1.9 ) (1.3 ) Net periodic benefit cost (b) (3.3 ) (2.9 ) (44.6 ) Gain from insurance recovery (c) - - 9.5 Total other expense - net $ (3.3 ) $ (4.3 ) $ (35.9 ) (a) Foreign currency transactions primarily consist of foreign currency transaction gains and losses on the re-measurement or settlement of foreign currency-denominated assets and liabilities, including intercompany loans and transactions denominated in a foreign currency, along with gains and losses on foreign currency exchange contracts. (b) Represents net periodic benefit cost, exclusive of service cost, for the Company’s pension and postretirement plans. (c) During fiscal 2016, the Company settled an insurance claim related to machinery and equipment destroyed in a fire at its Airedale facility and recorded a gain of $9.5 million. See Note 1 for additional information.

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Mar. 31, 2018
Income Taxes [Abstract]
Schedule of components of earnings before income taxes	The U.S. and foreign components of earnings before income taxes and the provision or benefit for income taxes consisted of the following: Years ended March 31, 2018 2017 2016 Components of earnings (loss) before income taxes: United States $ 2.5 $ (8.6 ) $ (15.4 ) Foreign 60.8 29.4 5.5 Total earnings (loss) before income taxes $ 63.3 $ 20.8 $ (9.9 ) Income tax provision (benefit): Federal: Current $ 11.6 $ 0.1 $ 0.1 Deferred 23.3 (3.8 ) (13.0 ) State: Current (0.3 ) 0.3 0.2 Deferred 2.0 (0.2 ) (2.5 ) Foreign: Current 16.1 10.1 9.6 Deferred (13.2 ) (0.6 ) (3.3 ) Total income tax provision (benefit) $ 39.5 $ 5.9 $ (8.9 )
Reconciliation of the federal statutory income tax rate to the company's effective income tax rate	The reconciliation between the U.S. federal statutory rate and the Company’s effective tax rate was as follows: Years ended March 31, 2018 2017 2016 Statutory federal tax 31.5 % 35.0 % 35.0 % State taxes, net of federal benefit 2.9 (3.3 ) 11.5 Taxes on non-U.S. earnings and losses (3.8 ) (3.5 ) 26.4 Valuation allowances (5.6 ) 1.2 (20.9 ) Tax credits (17.3 ) (9.0 ) 20.5 Compensation (0.8 ) 2.9 (3.7 ) Tax rate or law changes 60.1 (2.5 ) 1.3 Uncertain tax positions, net of settlements (0.8 ) 5.6 (4.3 ) Notional interest deductions (3.2 ) (8.8 ) - Dividend repatriation 0.2 7.1 16.0 Other (0.8 ) 3.7 8.1 Effective tax rate 62.4 % 28.4 % 89.9 %
Schedule of deferred tax assets and deferred tax liabilities	The tax effects of temporary differences that gave rise to deferred tax assets and liabilities were as follows: March 31, 2018 2017 Deferred tax assets: Accounts receivable $ 0.3 $ 0.4 Inventories 4.1 5.0 Plant and equipment 2.3 3.7 Pension and employee benefits 36.0 51.8 Net operating loss, capital loss, and credit carryforwards 139.2 147.5 Other, principally accrued liabilities 9.9 10.9 Total gross deferred tax assets 191.8 219.3 Less: valuation allowances (48.9 ) (49.6 ) Net deferred tax assets 142.9 169.7 Deferred tax liabilities: Plant and equipment 17.6 21.2 Goodwill 5.2 4.7 Intangible assets 32.4 43.3 Other 0.7 1.8 Total gross deferred tax liabilities 55.9 71.0 Net deferred tax assets $ 87.0 $ 98.7
Reconciliation of unrecognized tax benefits	Unrecognized tax benefits were as follows: Years ended March 31, 2018 2017 Beginning balance $ 14.2 $ 5.9 Gross increases - tax positions in prior period 0.8 0.3 Gross decreases - tax positions in prior period (a) (1.2 ) (0.2 ) Gross increases - due to acquisition 1.4 7.3 Gross increases - tax positions in current period 0.5 0.9 Settlements (0.3 ) - Lapse of statute of limitations (1.8 ) - Ending balance $ 13.6 $ 14.2 (a) Includes $1.0 million related to the reduction of the U.S. federal corporate tax rate as a result of the Tax Act.
Schedule of tax years subject to examination by the respective major tax jurisdictions	The following tax years remain subject to examination for the Company’s major tax jurisdictions: Germany Fiscal 2011 - Fiscal 2017 Italy Calendar 2013 - Fiscal 2017 United States Fiscal 2015 - Fiscal 2017

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Components of basic and diluted earnings per share	The components of basic and diluted earnings per share were as follows: Years ended March 31, 2018 2017 2016 Basic Earnings Per Share: Net earnings (loss) attributable to Modine $ 22.2 $ 14.2 $ (1.6 ) Less: Undistributed earnings attributable to unvested shares (0.2 ) (0.2 ) - Net earnings (loss) available to Modine shareholders $ 22.0 $ 14.0 $ (1.6 ) Weighted-average shares outstanding - basic 49.9 47.8 47.3 Net earnings (loss) per share - basic $ 0.44 $ 0.29 $ (0.03 ) Diluted Earnings Per Share: Net earnings (loss) attributable to Modine $ 22.2 $ 14.2 $ (1.6 ) Less: Undistributed earnings attributable to unvested shares (0.1 ) (0.1 ) - Net earnings (loss) available to Modine shareholders $ 22.1 $ 14.1 $ (1.6 ) Weighted-average shares outstanding - basic 49.9 47.8 47.3 Effect of dilutive securities 1.0 0.5 - Weighted-average shares outstanding - diluted 50.9 48.3 47.3 Net earnings (loss) per share - diluted $ 0.43 $ 0.29 $ (0.03 )

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Mar. 31, 2018
Inventories [Abstract]
Inventories	Inventories consisted of the following: March 31, 2018 2017 Raw materials $ 114.5 $ 100.2 Work in process 34.8 27.5 Finished goods 42.1 40.8 Total inventories $ 191.3 $ 168.5

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Mar. 31, 2018
Property, Plant and Equipment [Abstract]
Property, plant and equipment	Property, plant and equipment, including depreciable lives, consisted of the following: March 31, 2018 2017 Land $ 22.6 $ 18.9 Buildings and improvements (10-40 years) 295.6 255.6 Machinery and equipment (3-12 years) 840.8 755.5 Office equipment (3-10 years) 93.0 92.5 Construction in progress 50.2 55.1 1,302.2 1,177.6 Less: accumulated depreciation (797.9 ) (718.6 ) Net property, plant and equipment $ 504.3 $ 459.0

Intangible Assets (Tables)

Intangible Assets (Tables)	12 Months Ended
	Mar. 31, 2018
Intangible Assets [Abstract]
Schedule of intangible assets	Intangible assets consisted of the following: March 31, 2018 March 31, 2017 Gross Carrying Value Accumulated Amortization Net Intangible Assets Gross Carrying Value Accumulated Amortization Net Intangible Assets Customer relationships $ 64.2 $ (5.7 ) $ 58.5 $ 60.5 $ (1.7 ) $ 58.8 Trade names 60.6 (10.8 ) 49.8 58.4 (7.2 ) 51.2 Acquired technology 25.2 (3.6 ) 21.6 27.0 (2.9 ) 24.1 Total intangible assets $ 150.0 $ (20.1 ) $ 129.9 $ 145.9 $ (11.8 ) $ 134.1

Goodwill (Tables)

Goodwill (Tables)	12 Months Ended
	Mar. 31, 2018
Goodwill [Abstract]
Schedule of changes in the carrying amount of goodwill	Changes in the carrying amount of goodwill, by segment and in the aggregate, were as follows: Asia BHVAC CIS Total Balance, March 31, 2016 $ 0.5 $ 15.3 $ - $ 15.8 Acquired goodwill (a) - - 150.6 150.6 Effect of exchange rate changes - (1.6 ) 0.3 (1.3 ) Balance, March 31, 2017 0.5 13.7 150.9 165.1 Acquired goodwill (a) - - 1.3 1.3 Effect of exchange rate changes - 1.3 6.1 7.4 Balance, March 31, 2018 $ 0.5 $ 15.0 $ 158.3 $ 173.8 (a) See Note 2 for additional information about the goodwill recorded as a result of the acquisition of Luvata HTS.

Product Warranties, Operating44

Product Warranties, Operating Leases, and Other Commitments (Tables)	12 Months Ended
	Mar. 31, 2018
Product Warranties, Operating Leases, and Other Commitments [Abstract]
Changes in accrued warranty costs	Changes in accrued warranty costs were as follows: Years ended March 31, 2018 2017 Beginning balance $ 10.0 $ 8.3 Warranties recorded at time of sale 6.7 5.2 Adjustments to pre-existing warranties (0.8 ) 0.3 Additions and adjustments due to acquisition (a) (1.0 ) 4.1 Settlements (6.2 ) (7.6 ) Effect of exchange rate changes 0.6 (0.3 ) Ending balance $ 9.3 $ 10.0 (a) During fiscal 2018, the Company decreased its liability for product warranties by $1.0 million as a result of measurement period adjustments made in connection with purchase accounting for the acquisition of Luvata HTS. See Note 2 for additional information.
Schedule of future minimum rental commitments under non-cancelable operating leases	Future minimum rental commitments at March 31, 2018 under non-cancelable operating leases were as follows: Fiscal Year 2019 $ 14.4 2020 12.0 2021 10.4 2022 7.1 2023 6.6 2024 and beyond 24.6 Total $ 75.1

Indebtedness (Tables)

Indebtedness (Tables)	12 Months Ended
	Mar. 31, 2018
Indebtedness [Abstract]
Schedule of long-term indebtedness	Long-term debt consisted of the following: Fiscal year of maturity March 31, 2018 March 31, 2017 Term Loans 2022 $ 267.8 $ 268.9 6.8% Senior Notes 2021 101.0 117.0 5.8% Senior Notes 2027 50.0 50.0 Other (a) 2032 12.8 8.3 431.6 444.2 Less: current portion (39.9 ) (31.8 ) Less: unamortized debt issuance costs (5.4 ) (6.7 ) Total long-term debt $ 386.3 $ 405.7 (a) Other long-term debt includes borrowings by foreign subsidiaries, capital lease obligations and other financing-type obligations.
Maturities of long term debt and capital lease obligations	Long-term debt matures as follows: Fiscal Year 2019 $ 39.9 2020 47.2 2021 102.5 2022 193.9 2023 8.8 2024 & beyond 39.3 Total $ 431.6

Pension and Employee Benefit 46

Pension and Employee Benefit Plans (Tables)	12 Months Ended
	Mar. 31, 2018
Pension and Employee Benefit Plans [Abstract]
Change in benefit obligations and plan assets as well as the funded status	Changes in benefit obligations and plan assets, as well as the funded status of the Company’s pension plans, for the fiscal years ended March 31, 2018 and 2017 were as follows: 2018 2017 Change in benefit obligation: Benefit obligation at beginning of year $ 269.8 $ 261.0 Service cost 0.5 0.6 Interest cost 9.9 9.8 Actuarial loss (gain) 4.4 (0.5 ) Benefits paid (16.9 ) (19.8 ) Curtailment gain (a) (0.3 ) - Acquired obligations (b) - 20.3 Effect of exchange rate changes 6.2 (1.6 ) Benefit obligation at end of year $ 273.6 $ 269.8 Change in plan assets: Fair value of plan assets at beginning of year $ 148.2 $ 141.5 Actual return on plan assets 10.4 11.0 Benefits paid (16.9 ) (19.8 ) Employer contributions 16.0 9.5 Acquired plan assets (b) - 6.0 Fair value of plan assets at end of year $ 157.7 $ 148.2 Funded status at end of year $ (115.9 ) $ (121.6 ) Amounts recognized in the consolidated balance sheets: Current liability $ (6.3 ) $ (2.2 ) Noncurrent liability (109.6 ) (119.4 ) $ (115.9 ) $ (121.6 ) (a) During the third quarter of fiscal 2018, the Company recorded a pension curtailment gain associated with the closure of a manufacturing facility in Austria (CIS segment). See Note 5 for additional information regarding the closure of this facility. (b) In fiscal 2017, as a result of its acquisition of Luvata HTS, the Company acquired pension plans in Italy, Austria and the U.S. See Note 2 for additional information regarding this acquisition.
Pension benefit plans	Costs for the Company’s pension plans included the following components for the fiscal years ended March 31, 2018, 2017, and 2016: 2018 2017 2016 Components of net periodic benefit cost: Service cost $ 0.5 $ 0.6 $ 0.6 Interest cost 9.9 9.8 11.2 Expected return on plan assets (11.9 ) (12.3 ) (14.9 ) Amortization of net actuarial loss 5.6 5.6 6.4 Settlements (a) 0.3 - 42.1 Curtailment gain (b) (0.3 ) - - Net periodic benefit cost $ 4.1 $ 3.7 $ 45.4 Other changes in benefit obligation recognized in other comprehensive income (loss): Net actuarial loss $ (5.8 ) $ (1.0 ) $ (17.5 ) Amortization of net actuarial loss (a) 5.9 5.6 48.5 Total recognized in other comprehensive income (loss) $ 0.1 $ 4.6 $ 31.0 (a) During fiscal 2016, in connection with lump-sum payouts to pension plan participants, the Company recorded $42.1 million of settlement losses, which were previously recorded in accumulated other comprehensive loss. (b) During the third quarter of fiscal 2018, the Company recorded a pension curtailment gain associated with the closure of a manufacturing facility in Austria (CIS segment). See Note 5 for additional information regarding the closure of this facility.
Target and plan asset allocations	The Company’s U.S. pension plan weighted-average asset allocations at the measurement dates of March 31, 2018 and 2017 were as follows: Target allocation as of March 31, 2018 Plan assets 2018 2017 Equity securities 60 % 58 % 58 % Debt securities 38 % 38 % 38 % Cash and cash equivalents 2 % 4 % 4 % 100 % 100 % 100 %
Estimated future benefit payments	Estimated pension benefit payments for the next ten fiscal years are as follows: Fiscal Year Estimated Pension Benefit Payments 2019 $ 20.4 2020 16.5 2021 17.0 2022 17.2 2023 17.4 2024-2028 85.2

Derivative Instruments (Tables)

Derivative Instruments (Tables)	12 Months Ended
	Mar. 31, 2018
Derivative Instruments [Abstract]
Fair value of derivative financial instruments recorded in the consolidated balance sheets	The fair value of the Company’s derivative financial instruments recorded in the consolidated balance sheets were as follows: Balance Sheet Location March 31, 2018 March 31, 2017 Derivatives designated as hedges: Commodity derivatives Other current assets $ 0.1 $ - Foreign exchange contracts Other current assets 0.1 - Derivatives not designated as hedges: Commodity derivatives Other current assets $ - $ 0.7 Commodity derivatives Other current liabilities 0.2 - Foreign exchange contracts Other current assets 0.2 0.2 Foreign exchange contracts Other current liabilities 0.6 -
Amounts recorded in AOCI and in consolidated statement of operations	The amounts recorded in the consolidated statements of operations for the Company’s non-designated derivative financial instruments were as follows: Years ended March 31, Statement of Operations Location 2018 2017 2016 Commodity derivatives Cost of sales $ 0.4 $ 0.5 $ (0.7 ) Foreign exchange contracts Net sales (0.1 ) - - Foreign exchange contracts Other income (expense) - net (0.5 ) 1.3 0.6 Total gains (losses) $ (0.2 ) $ 1.8 $ (0.1 )

Accumulated Other Comprehensi48

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Mar. 31, 2018
Accumulated Other Comprehensive Loss [Abstract]
Components of accumulated other comprehensive loss	Changes in accumulated other comprehensive loss were as follows: Foreign Currency Translation Defined Benefit Plans Cash Flow Hedges Total Balance, March 31, 2017 $ (46.8 ) $ (135.0 ) $ - $ (181.8 ) Other comprehensive income (loss) before reclassifications 41.3 (5.7 ) 0.3 35.9 Reclassifications for amortization of unrecognized net loss (a) - 5.6 - 5.6 Reclassifications of realized gains (b) - - (0.1 ) (0.1 ) Income taxes - 0.2 (0.1 ) 0.1 Total other comprehensive income 41.3 0.1 0.1 41.5 Balance, March 31, 2018 $ (5.5 ) $ (134.9 ) $ 0.1 $ (140.3 ) Foreign Currency Translation Defined Benefit Plans Total Balance, March 31, 2016 $ (36.0 ) $ (138.2 ) $ (174.2 ) Other comprehensive income (loss) before reclassifications (10.8 ) (0.3 ) (11.1 ) Reclassifications for amortization of unrecognized net loss (a) - 5.2 5.2 Income taxes - (1.7 ) (1.7 ) Total other comprehensive income (loss) (10.8 ) 3.2 (7.6 ) Balance, March 31, 2017 $ (46.8 ) $ (135.0 ) $ (181.8 ) (a) Amounts are included in the calculation of net periodic benefit cost for the Company’s defined benefit plans, which include pension and other postretirement plans. See Note 16 for additional information about the Company’s pension plans. (b) Amounts reclassified to net earnings. See Note 17 for additional information regarding derivative instruments.

Segment and Geographic Inform49

Segment and Geographic Information (Tables)	12 Months Ended
	Mar. 31, 2018
Segment and Geographic Information [Abstract]
Net sales, gross profit, operating income and total assets by segment	The following is a summary of net sales, gross profit, and operating income by segment: Years ended March 31, Net sales: 2018 2017 2016 Americas $ 580.7 $ 534.0 $ 585.5 Europe 568.3 524.3 524.1 Asia 165.8 111.5 79.0 CIS 620.0 177.7 - BHVAC 191.2 171.6 181.4 Segment total 2,126.0 1,519.1 1,370.0 Corporate and eliminations (22.9 ) (16.1 ) (17.5 ) Net sales $ 2,103.1 $ 1,503.0 $ 1,352.5 Years ended March 31, 2018 2017 2016 Gross profit: $'s % of sales $'s % of sales $'s % of sales Americas $ 91.9 15.8 % $ 87.0 16.3 % $ 100.3 17.1 % Europe 83.8 14.7 % 81.6 15.6 % 69.5 13.3 % Asia 30.3 18.3 % 18.7 16.8 % 12.2 15.5 % CIS 92.1 14.9 % 26.0 14.6 % - - BHVAC 58.0 30.3 % 47.8 27.8 % 54.2 29.9 % Segment total 356.1 16.8 % 261.1 17.2 % 236.2 17.2 % Corporate and eliminations (a) 0.4 - (6.7 ) - (2.6 ) - Gross profit $ 356.5 17.0 % $ 254.4 16.9 % $ 233.6 17.3 % Years ended March 31, Operating income: 2018 2017 2016 Americas $ 38.2 $ 27.9 $ 36.9 Europe 33.6 38.2 14.7 Asia 17.6 7.7 0.8 CIS 25.8 7.5 - BHVAC 20.3 13.2 13.9 Segment total 135.5 94.5 66.3 Corporate and eliminations (a) (43.3 ) (52.2 ) (29.2 ) Operating income $ 92.2 $ 42.3 $ 37.1 (a) During fiscal 2018 and 2017, the Company recorded $4.3 million and $14.8 million, respectively, of costs incurred directly related to the acquisition and integration of Luvata HTS within SG&A expenses at Corporate. During fiscal 2017, the Company recorded $4.3 million in cost of sales related to an inventory purchase accounting adjustment at Corporate, as the impact was excluded from the Company’s measure of segment operating performance. The following is a summary of total assets by segment: March 31, 2018 2017 Americas $ 290.6 $ 282.9 Europe 324.0 269.4 Asia 144.5 111.3 CIS 630.0 576.0 BHVAC 88.1 85.2 Corporate and eliminations (a) 96.2 124.7 Total assets $ 1,573.4 $ 1,449.5 (a) The decrease in total assets at Corporate was primarily due to a decrease in deferred tax assets resulting from the impact of tax reform in the U.S. See Note 7 for additional information regarding the reduction in the corporate tax rate in the U.S.
Summary of capital expenditures and depreciation and amortization expense by segment	The following is a summary of capital expenditures and depreciation and amortization expense by segment: Years ended March 31, Capital expenditures: 2018 2017 2016 Americas $ 22.2 $ 26.3 $ 26.7 Europe 26.8 24.7 24.8 Asia 12.4 8.5 6.2 CIS 9.0 3.4 - BHVAC 0.6 1.5 5.1 Total capital expenditures $ 71.0 $ 64.4 $ 62.8 Years ended March 31, Depreciation and amortization expense: 2018 2017 2016 Americas $ 22.2 $ 22.7 $ 22.1 Europe 18.4 16.5 18.0 Asia 7.6 7.0 6.5 CIS 24.3 7.9 - BHVAC 4.2 4.2 3.6 Total depreciation and amortization expense $ 76.7 $ 58.3 $ 50.2
Summary of net sales and long-lived assets by geographical area	The following is a summary of net sales by geographical area, based upon the location of the selling unit: Years ended March 31, 2018 2017 2016 United States $ 911.4 $ 657.8 $ 627.6 Italy 211.5 94.4 44.1 China 156.0 73.7 29.3 Hungary 153.9 145.6 145.9 Austria 151.7 125.2 113.1 Germany 132.6 130.1 155.3 Other 386.0 276.2 237.2 Net sales $ 2,103.1 $ 1,503.0 $ 1,352.5
Summary of property, plant and equipment by geographical area	The following is a summary of property, plant and equipment by geographical area: March 31, 2018 2017 United States $ 121.5 $ 124.7 Italy 62.0 55.8 Hungary 59.3 37.7 China 49.6 40.0 Mexico 49.4 47.0 Austria 42.8 44.3 Germany 37.2 28.9 Other 82.5 80.6 Total property, plant and equipment $ 504.3 $ 459.0
Summary of net sales by end market	The following is a summary of net sales by end market: Years ended March 31, 2018 2017 2016 Automotive $ 526.0 $ 461.0 $ 396.8 Commercial vehicle 381.7 382.5 459.8 Off-highway 271.2 202.8 206.2 Other vehicular 61.9 55.8 57.6 Commercial & residential air conditioning 371.3 136.5 48.8 Commercial refrigeration 158.7 52.2 - Other HVAC&R 332.3 212.2 183.3 Net sales $ 2,103.1 $ 1,503.0 $ 1,352.5

Quarterly Financial Data (Una50

Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Mar. 31, 2018
Quarterly Financial Data (Unaudited) [Abstract]
Summary of quarterly financial data	Quarterly financial data is summarized below for the years ended March 31, 2018 and 2017: Fiscal 2018 quarters ended June Sept. Dec. March Fiscal 2018 Net sales $ 515.5 $ 508.3 $ 512.7 $ 566.6 $ 2,103.1 Gross profit 88.5 86.1 85.4 96.5 356.5 Net earnings (loss) (a) 17.4 16.3 (27.9 ) 18.0 23.8 Net earnings (loss) attributable to Modine (a) 17.0 15.9 (28.3 ) 17.6 22.2 Net earnings (loss) per share attributable to Modine shareholders: Basic $ 0.34 $ 0.32 $ (0.57 ) $ 0.35 $ 0.44 Diluted 0.34 0.31 (0.57 ) 0.34 0.43 Fiscal 2017 quarters ended June Sept. Dec. March Fiscal 2017 Net sales $ 347.2 $ 317.7 $ 349.8 $ 488.3 $ 1,503.0 Gross profit 62.3 48.0 59.0 85.1 254.4 Net earnings (loss) (b) 8.9 (4.0 ) 1.9 8.1 14.9 Net earnings (loss) attributable to Modine (b) 8.6 (4.1 ) 1.7 8.0 14.2 Net earnings (loss) per share attributable to Modine shareholders: Basic $ 0.18 $ (0.09 ) $ 0.04 $ 0.16 $ 0.29 Diluted 0.18 (0.09 ) 0.04 0.16 0.29 (a) During fiscal 2018, restructuring expenses totaled $1.7 million, $0.4 million, $9.4 million, and $4.5 million for the quarters ended June 30, 2017, September 30, 2017, December 31, 2017, and March 31, 2018, respectively (see Note 5). During the third quarter of fiscal 2018, the Company recorded a $1.3 million asset impairment charge related to a manufacturing facility in Austria (see Note 5). During the fourth quarter of fiscal 2018, the Company recorded a $1.2 million impairment charge related to intangible assets (see Note 12). During fiscal 2018, costs directly related to the acquisition and integration of Luvata HTS totaled $1.6 million, $1.1 million, $1.0 million, and $0.6 million for the quarters ended June 30, 2017, September 30, 2017, December 31, 2017, and March 31, 2018, respectively (see Note 2). The Company recorded charges totaling $35.7 million and $2.3 million resulting for certain income tax effects of recently-enacted U.S. tax legislation in the quarters ended December 31, 2017 and March 31, 2018, respectively (see Note 7). During the fourth quarter of fiscal 2018, the Company reversed a portion of a valuation allowance related to a foreign tax jurisdiction, and, as a result, recorded an income tax benefit of $2.8 million (see Note 7). (b) During fiscal 2017, restructuring expenses totaled $2.3 million, $2.1 million, $1.6 million, and $4.9 million for the quarters ended June 30, 2016, September 30, 2016, December 31, 2016, and March 31, 2017, respectively (see Note 5). During fiscal 2017, the Company sold two previously-closed manufacturing facilities in its Americas segment and a facility in its Europe segment and recognized net gains totaling $1.2 million and $0.8 million in the quarters ended September 30, 2016 and March 31, 2017, respectively. During fiscal 2017, costs directly related to the acquisition and integration of Luvata HTS totaled $1.4 million, $3.0 million, $7.2 million, and $3.2 million for the quarters ended June 30, 2016, September 30, 2016, December 31, 2016, and March 31, 2017, respectively (see Note 2). During the fourth quarter of fiscal 2017, the Company recorded a deferred tax valuation allowance related to a foreign tax jurisdiction, and, as a result, recorded income tax expense of $2.0 million (see Note 7).

Significant Accounting Polici51

Significant Accounting Policies, Acquisition of Luvata HTS and Consolidation Principles (Details)	Mar. 31, 2018	Nov. 30, 2016
Luvata HTS [Member]
Business Acquisition [Line Items]
Acquired ownership interest by the entity	100.00%	100.00%

Significant Accounting Polici52

Significant Accounting Policies, Significant Accounting Policies, Airedale facility fire, Tooling Costs and Research and Development (Details) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Unusual or Infrequent Item, or Both [Line Items]
Gain within other income related to insurance settlement	[1]	$ 0	$ 0	$ 9.5
Research and development [Abstract]
Research and development cost		$ 65.8	64.4	61.1
Loss by Fire [Member]
Unusual or Infrequent Item, or Both [Line Items]
Gain within other income related to insurance settlement				$ 9.5
Tools [Member]
Tooling [Abstract]
Property, plant and equipment, depreciable lives		3 years
Company-owned tooling, net		$ 22.4	20.8
Customer owned tooling receivable		$ 10.7	$ 7.8
[1]	During fiscal 2016, the Company settled an insurance claim related to machinery and equipment destroyed in a fire at its Airedale facility and recorded a gain of $9.5 million. See Note 1 for additional information.

Significant Accounting Polici53

Significant Accounting Policies, Short-term investments and Trade Accounts Receivable (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Short-term investments [Abstract]
Short-term investments	$ 5.7	$ 4.7
Trade accounts receivable [Abstract]
Trade receivables, allowance for doubtful accounts	(2.3)	(1.4)
Trade receivables sold without recourse	65.8	55.4	$ 71.3
Loss on the sale of accounts receivables	$ (0.4)	$ (0.3)	$ (0.3)

Significant Accounting Polici54

Significant Accounting Policies, Property, Plant and Equipment and Assets Held for Sale (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Property, plant and equipment [Abstract]
Capital expenditures accrued	$ 15.8	$ 12.5	$ 12.1
Assets Held For Sale [Abstract]
Carrying value of assets held-for-sale	$ 1.7	$ 5

Significant Accounting Polici55

Significant Accounting Policies, New Accounting Guidance (Details) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
New Accounting Guidance [Abstract]
Net periodic benefit cost	[1]	$ 3.3	$ 2.9	$ 44.6
Retained earnings		394.9	372.4
Deferred income taxes		96.9	108.4
Equity		490.1	414
Cost of Sales [Member]
New Accounting Guidance [Abstract]
Net periodic benefit cost			(1.1)	(10.1)
SG&A [Member]
New Accounting Guidance [Abstract]
Net periodic benefit cost			(1.8)	(34.5)
Other Income Expense [Member]
New Accounting Guidance [Abstract]
Net periodic benefit cost			$ 2.9	$ 44.6
ASU 2016-16 [Member]
New Accounting Guidance [Abstract]
Retained earnings		(8)
ASU 2016-09 [Member]
New Accounting Guidance [Abstract]
Deferred income taxes		0.4
Equity		$ 0.4
[1]	Represents net periodic benefit cost, exclusive of service cost, for the Company's pension and postretirement plans.

Significant Accounting Polici56

Significant Accounting Policies, New Accounting Guidance, Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ 394.9				$ 372.4					$ 394.9	$ 372.4
Net sales	566.6	$ 512.7	$ 508.3	$ 515.5	$ 488.3	$ 349.8	$ 317.7	$ 347.2		2,103.1	$ 1,503	$ 1,352.5
ASU 2014-09 [Member] | Maximum [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ 1									$ 1
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | ASU 2014-09 [Member] | Forecast [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net sales									$ 3

Significant Accounting Polici57

Significant Accounting Policies, Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Supplemental cash flow information [Abstract]
Interest paid	$ 23.4	$ 15.4	$ 10.7
Income taxes paid	$ 20.1	$ 12.7	$ 10.1

Acquisitions, Luvata HTS (Detai

Acquisitions, Luvata HTS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	Nov. 30, 2016	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2017	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Jan. 29, 2016
Business Acquisition [Line Items]
Cost related to acquisition and integration		$ 0.6	$ 1	$ 1.1	$ 1.6	$ 3.2	$ 7.2	$ 3	$ 1.4
Allocation of Purchase Price for Acquisition [Abstract]
Goodwill		173.8				165.1					$ 173.8	$ 165.1	$ 15.8
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Interest expense											25.6	17.2	11.1
Commercial and Industrial Solutions ("CIS") [Member]
Business Acquisition [Line Items]
Net sales											620	177.7
Operating income											25.8	7.5
Goodwill - measurement-period adjustments										$ 1.3
Allocation of Purchase Price for Acquisition [Abstract]
Goodwill		$ 158.3				150.9					$ 158.3	150.9	0
Modine Puxin Thermal System (Jiangsu) Co. Ltd. [Member]
Allocation of Purchase Price for Acquisition [Abstract]
Property, plant and equipment														$ 1.5
Acquisition-related Costs [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Amortization and depreciation expense												13
Interest expense												14
Acquisition related transaction costs						8.6						8.6
Inventory purchase accounting adjustment												4.3
Luvata HTS [Member]
Business Acquisition [Line Items]
Acquired ownership interest by the entity	100.00%	100.00%									100.00%
Purchase price allocation, net of cash acquired	$ 388.2
Cost related to acquisition and integration											$ 4.3	14.8
Allocation of Purchase Price for Acquisition [Abstract]
Cash and cash equivalents	27.4
Trade accounts receivable	86.1
Inventories	55
Property, plant and equipment	120.4
Intangible assets	130.2
Goodwill	151.9					$ 150.6						150.6
Other assets	39.1
Accounts payable	(73.7)
Accrued compensation and employee benefits	(24.3)
Deferred income taxes	(39.5)
Pensions	(14.3)
Other liabilities	(42.7)
Purchase price	415.6
Pro Forma Information [Abstract]
Net sales												1,881.6	1,871.9
Net earnings attributable to Modine												$ 35.8	$ 1.5
Net earnings per share attributable to Modine Shareholders [Abstract]
Basic (in dollars per share)												$ 0.72	$ 0.03
Diluted (in dollars per share)												$ 0.71	$ 0.03
Luvata HTS [Member] | Customer Relationships [Member]
Allocation of Purchase Price for Acquisition [Abstract]
Intangible assets	$ 58.4
Weighted-average useful life, intangible assets, amortization period	17 years
Luvata HTS [Member] | Trade Names [Member]
Allocation of Purchase Price for Acquisition [Abstract]
Intangible assets	$ 50.1
Weighted-average useful life, intangible assets, amortization period	20 years
Luvata HTS [Member] | Acquired Technology [Member]
Allocation of Purchase Price for Acquisition [Abstract]
Intangible assets	$ 21.7
Weighted-average useful life, intangible assets, amortization period	12 years
Luvata HTS [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Shares issued to acquire Luvata HTS (in shares)	2.2
Value of shares issued to acquire Luvata HTS	$ 24.3

Acquisitions, Modine Puxin Ther

Acquisitions, Modine Puxin Thermal Systems (Jiangsu) Co. Ltd (Details) - USD ($) $ in Millions	Jan. 29, 2016	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Business Acquisition [Line Items]
Purchase price allocation, net of cash		$ 0	$ 364.2	$ 1.4
Modine Puxin Thermal System (Jiangsu) Co. Ltd. [Member]
Business Acquisition [Line Items]
Ownership percentage	67.00%
Purchase price allocation, net of cash	$ 1.4
Additional cash consideration amount			$ 0.3
Purchase price allocation resulted in acquired equipment and other assets	2.3
Purchase price allocation resulted in property, plant and equipment/acquired equipment and other long-lived assets	1.5
Purchase price allocation, working capital net assets	$ 0.8
Jiangsu Puxin Heat Exchange System Co., Ltd [Member]
Business Acquisition [Line Items]
Ownership percentage by parent	33.00%

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Millions		Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Deferred Compensation Liability [Abstract]
Deferred compensation obligations		$ 5.8	$ 5
Trading securities		5.8	5
U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets		157.7	148.2	$ 141.5
U.S. Pension Plans [Member] | Fair Value Excluding Investment Measured at Net Asset Value [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets		142.9	139.5
U.S. Pension Plans [Member] | Investment Measured at Net Asset Value [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets	[1]	14.8	8.7
Money Market Investments [Member] | U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets		11.4	5.6
Common Stocks [Member] | U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets		12	19.8
Corporate Bonds [Member] | U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets		9.7	9.3
Pooled Equity Funds [Member] | U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets		64.4	56.8
Pooled Fixed-income Funds [Member] | U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets		27.3	26.5
US Government and Agency Securities [Member] | U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets		16.2	18.7
Other [Member] | U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets		1.9	2.8
Level 1 [Member] | U.S. Pension Plans [Member] | Fair Value Excluding Investment Measured at Net Asset Value [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets		101.3	102.5
Level 1 [Member] | Money Market Investments [Member] | U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets		0	0
Level 1 [Member] | Common Stocks [Member] | U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets		9.4	17.8
Level 1 [Member] | Corporate Bonds [Member] | U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets		0	0
Level 1 [Member] | Pooled Equity Funds [Member] | U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets		64.4	56.8
Level 1 [Member] | Pooled Fixed-income Funds [Member] | U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets		27.3	26.5
Level 1 [Member] | US Government and Agency Securities [Member] | U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets		0	0
Level 1 [Member] | Other [Member] | U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets		0.2	1.4
Level 2 [Member] | U.S. Pension Plans [Member] | Fair Value Excluding Investment Measured at Net Asset Value [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets		41.6	37
Level 2 [Member] | Money Market Investments [Member] | U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets		11.4	5.6
Level 2 [Member] | Common Stocks [Member] | U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets		2.6	2
Level 2 [Member] | Corporate Bonds [Member] | U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets		9.7	9.3
Level 2 [Member] | Pooled Equity Funds [Member] | U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets		0	0
Level 2 [Member] | Pooled Fixed-income Funds [Member] | U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets		0	0
Level 2 [Member] | US Government and Agency Securities [Member] | U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets		16.2	18.7
Level 2 [Member] | Other [Member] | U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets		1.7	1.4
Level 3 [Member] | U.S. Pension Plans [Member]
U.S. pension plan assets [Abstract]
Fair value of plan assets		$ 0	$ 0
[1]	As a practical expedient, the Company valued a collective trust fund using its net asset value per unit, and therefore, has not classified this investment within the fair value hierarchy.

Stock-Based Compensation, Incen

Stock-Based Compensation, Incentive Compensation Plan (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Compensation expense [Abstract]
Stock-based compensation cost	$ 9.5	$ 7.4	$ 4.9
2017 Incentive Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)	3.6

Stock-Based Compensation, Stock

Stock-Based Compensation, Stock Options (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Compensation expense [Abstract]
Stock-based compensation cost	$ 9.5	$ 7.4	$ 4.9
Stock Options [Member]
Compensation expense [Abstract]
Stock-based compensation cost	1.2	1.1	0.9
Fair value of awards vesting	1.2	$ 1	$ 0.9
Unrecognized compensation costs	$ 2.2
Weighted average period recognized	2 years 6 months
Assumptions for stock awards granted [Abstract]
Fair value of options (in dollars per share)	$ 7.30	$ 4.60	$ 7.11
Expected life of awards in years	6 years 4 months 24 days	6 years 4 months 24 days	6 years 3 months 18 days
Risk-free interest rate	1.90%	1.40%	1.90%
Expected volatility of the Company's stock	44.30%	45.50%	66.90%
Expected dividend yield on the Company's stock	0.00%	0.00%	0.00%
Annual vesting percentage	25.00%
Award performance period	4 years
Stock options activity [Rollforward]
Outstanding, beginning (in shares)	1.5
Granted (in shares)	0.2
Exercised (in shares)	(0.4)
Forfeited or expired (in shares)	(0.1)
Outstanding, ending (in shares)	1.2	1.5
Exercisable, ending (in shares)	0.7
Weighted average exercise price [Rollforward]
Outstanding, beginning (in dollars per share)	$ 9.83
Granted (in dollars per share)	15.90
Exercised (in dollars per share)	8.89
Forfeited or expired (in dollars per share)	12.64
Outstanding, ending (in dollars per share)	11.16	$ 9.83
Exercisable, ending (in dollars per share)	$ 9.99
Summary of stock option activity [Abstract]
Options, Outstanding, Weighted average remaining contractual term	6 years 1 month 6 days
Options, Outstanding, Aggregate intrinsic value	$ 12.2
Options, Exercisable, Weighted average remaining contractual term	4 years 7 months 6 days
Options, Exercisable, Aggregate intrinsic value	$ 8
Additional information related to stock options exercised [Abstract]
Intrinsic value of stock options exercised	4.9	$ 0.5	$ 0.4
Proceeds from stock options exercised	$ 4.3	$ 0.9	$ 0.5
Stock Options [Member] | Maximum [Member]
Assumptions for stock awards granted [Abstract]
Stock option term	10 years

Stock-Based Compensation, Restr

Stock-Based Compensation, Restricted Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Compensation expense [Abstract]
Stock-based compensation cost	$ 9.5	$ 7.4	$ 4.9
Restricted Stock [Member]
Compensation expense [Abstract]
Stock-based compensation cost	3.9	3.8	3.5
Fair value of awards vesting	3.9	$ 4	3.4
Unrecognized compensation costs	$ 5
Weighted average period recognized	2 years 6 months
Assumptions for stock awards granted [Abstract]
Annual vesting percentage	25.00%
Award performance period	4 years
Restricted stock activity [Roll Forward]
Non-vested balance, beginning (in shares)	0.6
Granted (in shares)	0.3
Vested (in shares)	(0.3)
Non-vested balance, ending (in shares)	0.6	0.6
Weighted average price [Rollforward]
Non-vested balance, beginning (in dollars per share)	$ 11.21
Granted (in dollars per share)	16.12
Vested (in dollars per share)	12.56
Non-vested balance, ending (in dollars per share)	$ 12.24	$ 11.21
Performance Stock Awards [Member]
Compensation expense [Abstract]
Stock-based compensation cost	$ 4.4	$ 2.5	$ 0.5
Unrecognized compensation costs	$ 4.3
Weighted average period recognized	1 year 8 months 12 days
Assumptions for stock awards granted [Abstract]
Award performance period	3 years	3 years	3 years

Restructuring Activities (Detai

Restructuring Activities (Details) $ in Millions	3 Months Ended				12 Months Ended
	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Mar. 31, 2017USD ($)	Sep. 30, 2016USD ($)	Mar. 31, 2018USD ($)	Mar. 31, 2017USD ($)Facility	Mar. 31, 2016USD ($)
Restructuring and repositioning expenses [Abstract]
Employee severance and related benefits					$ 13	$ 5.3	$ 12.8
Other restructuring and repositioning expenses					3	5.6	3.8
Total					16	10.9	16.6
Changes in accrued severance [Roll Forward]
Beginning balance					6.5	14.7
Additions					13	5.3
Payments					(9.4)	(12.9)
Effect of exchange rate changes					0.9	(0.6)
Ending balance	$ 11		$ 6.5		11	$ 6.5	14.7
Other [Abstract]
Number of closed manufacturing facilities sold | Facility						2
Proceeds from dispositions of assets					0.3	$ 5.7	0.4
Gain on sale of assets			$ 0.8	$ 1.2	0	2	0
Asset impairment charges	$ 1.2	$ 1.3			2.5	$ 0	9.9
Commercial and Industrial Solutions ("CIS") [Member]
Other [Abstract]
Restructuring expense					8.3
Asset impairment charges					$ 1.3
Europe Segment [Member]
Other [Abstract]
Asset impairment charges							$ 9.9
America Segment [Member]
Other [Abstract]
Number of closed manufacturing facilities sold | Facility						2
Europe and Americas Segment [Member]
Other [Abstract]
Proceeds from dispositions of assets						$ 5.4
Gain on sale of assets						$ 2

Other Income and Expense (Detai

Other Income and Expense (Details) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Other Income and Expense [Abstract]
Equity in earnings of non-consolidated affiliate		$ 0.2	$ 0.1	$ 0.1
Interest income		0.4	0.4	0.4
Foreign currency transactions	[1]	(0.6)	(1.9)	(1.3)
Net periodic benefit cost	[2]	(3.3)	(2.9)	(44.6)
Gain from insurance recovery	[3]	0	0	9.5
Total other expense - net		$ (3.3)	$ (4.3)	$ (35.9)
[1]	Foreign currency transactions primarily consist of foreign currency transaction gains and losses on the re-measurement or settlement of foreign currency-denominated assets and liabilities, including intercompany loans and transactions denominated in a foreign currency, along with gains and losses on foreign currency exchange contracts.
[2]	Represents net periodic benefit cost, exclusive of service cost, for the Company's pension and postretirement plans.
[3]	During fiscal 2016, the Company settled an insurance claim related to machinery and equipment destroyed in a fire at its Airedale facility and recorded a gain of $9.5 million. See Note 1 for additional information.

Income Taxes, Components of Ear

Income Taxes, Components of Earnings Before Income Taxes and the Provision or Benefit for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Components of earnings (loss) before income taxes [Abstract]
United States	$ 2.5	$ (8.6)	$ (15.4)
Foreign	60.8	29.4	5.5
Earnings (loss) before income taxes	63.3	20.8	(9.9)
Federal [Abstract]
Current	11.6	0.1	0.1
Deferred	23.3	(3.8)	(13)
State [Abstract]
Current	(0.3)	0.3	0.2
Deferred	2	(0.2)	(2.5)
Foreign [Abstract]
Current	16.1	10.1	9.6
Deferred	(13.2)	(0.6)	(3.3)
Total income tax provision (benefit)	$ 39.5	$ 5.9	$ (8.9)

Income Taxes, Tax Cuts and Jobs

Income Taxes, Tax Cuts and Jobs Act (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Income Tax Disclosure [Line Items]
Statutory federal tax		35.00%		31.50%	35.00%	35.00%
Provisional discrete tax charges				$ 38
Deferred tax assets - change in amount				(19)
Transition tax charge				19
Transition tax liability	$ 19			$ 19
Estimated payment period for transition tax liability				8 years
Plan [Member]
Income Tax Disclosure [Line Items]
Statutory federal tax	21.00%		21.00%
Estimated transition tax liability to be paid in the future			$ 1.5

Income Taxes, Reconciliation Be

Income Taxes, Reconciliation Between the U.S. Federal Statutory Rate and the Effective Tax Rate (Details)	9 Months Ended	12 Months Ended
	Dec. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Reconciliation of federal statutory income tax rate to company's effective income tax rate [Abstract]
Statutory federal tax	35.00%	31.50%	35.00%	35.00%
State taxes, net of federal benefit		2.90%	(3.30%)	11.50%
Taxes on non-U.S. earnings and losses		(3.80%)	(3.50%)	26.40%
Valuation allowance		(5.60%)	1.20%	(20.90%)
Tax credits		(17.30%)	(9.00%)	20.50%
Compensation		(0.80%)	2.90%	(3.70%)
Tax rate or law changes		60.10%	(2.50%)	1.30%
Uncertain tax positions, net of settlements		(0.80%)	5.60%	(4.30%)
Notional interest deductions		(3.20%)	(8.80%)	0.00%
Dividend repatriation		0.20%	7.10%	16.00%
Other		(0.80%)	3.70%	8.10%
Effective tax rate		62.40%	28.40%	89.90%

Income Taxes, Unrecognized Tax

Income Taxes, Unrecognized Tax Benefits, and Deferred Tax Asset Valuation Allowances (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Tax Credit Carryforward [Line Items]
Tax (benefit) from foreign development tax credit		$ 39.5	$ 5.9	$ (8.9)
Valuation Allowance [Line Items]
Valuation allowance - deferred tax assets		48.9	49.6
Foreign Tax Jurisdictions [Member]
Valuation Allowance [Line Items]
Valuation allowance - deferred tax assets			2
Valuation allowance - deferred tax assets change in amount		(2.8)		(3)
Other Tax Jurisdictions [Member]
Valuation Allowance [Line Items]
Valuation allowance - deferred tax assets change in amount			$ (1.8)	$ 5
Forecast [Member] | Foreign Tax Jurisdictions [Member]
Valuation Allowance [Line Items]
Valuation allowance - deferred tax assets change in amount	$ (3)
Hungarian Development Tax Credit [Member]
Tax Credit Carryforward [Line Items]
Tax (benefit) from foreign development tax credit		$ (9)

Income Taxes, Deferred Tax Asse

Income Taxes, Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2018	Mar. 31, 2017
Deferred tax assets [Abstract]
Accounts receivable	$ 0.3	$ 0.4
Inventories	4.1	5
Plant and equipment	2.3	3.7
Pension and employee benefits	36	51.8
Net operating loss, capital loss and credit carryforwards	139.2	147.5
Other, principally accrued liabilities	9.9	10.9
Total gross deferred tax assets	191.8	219.3
Less: valuation allowances	(48.9)	(49.6)
Net deferred tax assets	142.9	169.7
Deferred tax liabilities [Abstract]
Plant and equipment	17.6	21.2
Goodwill	5.2	4.7
Intangible assets	32.4	43.3
Other	0.7	1.8
Total gross deferred tax liabilities	55.9	71
Net deferred tax asset	$ 87	$ 98.7

Income Taxes, Unrecognized Ta71

Income Taxes, Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018		Mar. 31, 2017
Reconciliation of unrecognized tax benefits [Roll Forward]
Beginning balance	$ 13.6	$ 14.2		$ 5.9
Gross increases - tax positions in prior period		0.8		0.3
Gross decreases - tax positions in prior period		(1.2)	[1]	(0.2)
Gross increases - due to acquisition		1.4		7.3
Gross increases - tax positions in current period		0.5		0.9
Settlements		(0.3)		0
Lapse of statute of limitations		(1.8)		0
Ending balance		13.6		14.2
Unrecognized tax benefits that would impact effective tax rate	1.6	12.1
Unrecognized tax benefits accrued interest and penalties		1		$ 0.8
Change in income tax expense (benefit) due to the reduction of federal corporate tax		$ 1
Forecast [Member]
Reconciliation of unrecognized tax benefits [Roll Forward]
Lapse of statute of limitations	$ (2.2)
[1]	Includes $1.0 million related to the reduction of the U.S. federal corporate tax rate as a result of the Tax Act.

Income Taxes, Income Tax Examin

Income Taxes, Income Tax Examination, and Tax Credits and Carryforwards (Details) $ in Millions	12 Months Ended
	Mar. 31, 2018USD ($)
Operating Loss Carryforwards [Line Items]
Unrecognized foreign withholding taxes and deferred tax liabilities	$ 6
Germany [Member]
Income Tax Examination [Line Items]
Open tax year for examination by tax jurisdictions	Fiscal 2011 - Fiscal 2017
Italy [Member]
Income Tax Examination [Line Items]
Open tax year for examination by tax jurisdictions	Calendar 2013 - Fiscal 2017
United States [Member]
Income Tax Examination [Line Items]
Open tax year for examination by tax jurisdictions	Fiscal 2015 - Fiscal 2017
Federal and State [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforwards, research and development	$ 31.5
Federal and State [Member] | Minimum [Member]
Tax Credit Carryforward [Line Items]
Tax loss credit carryforward, expiration date	Mar. 31, 2019
Federal and State [Member] | Maximum [Member]
Tax Credit Carryforward [Line Items]
Tax loss credit carryforward, expiration date	Mar. 31, 2038
Foreign Tax Jurisdictions [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	$ 475
Tax losses subject to expiration	132.7
Tax losses not subject to expiration	$ 342.3
Foreign Tax Jurisdictions [Member] | Minimum [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards, expiration date	Mar. 31, 2019
Foreign Tax Jurisdictions [Member] | Maximum [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards, expiration date	Mar. 31, 2038
State and Local [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	$ 183.1
State and Local [Member] | Minimum [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards, expiration date	Mar. 31, 2019
State and Local [Member] | Maximum [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards, expiration date	Mar. 31, 2038

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended																12 Months Ended
	Mar. 31, 2018		Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2016		Sep. 30, 2016		Jun. 30, 2016		Mar. 31, 2018		Mar. 31, 2017		Mar. 31, 2016
Basic Earnings Per Share [Abstract]
Net earnings (loss) attributable to Modine	$ 17.6	[1]	$ (28.3)	[1]	$ 15.9	[1]	$ 17	[1]	$ 8	[2]	$ 1.7	[2]	$ (4.1)	[2]	$ 8.6	[2]	$ 22.2	[1]	$ 14.2	[2]	$ (1.6)
Less: Undistributed earnings attributable to unvested shares																	(0.2)		(0.2)		0
Net earnings (loss) available to Modine shareholders																	$ 22		$ 14		$ (1.6)
Weighted-average shares outstanding - basic (in shares)																	49.9		47.8		47.3
Net earnings (loss) per share - basic (in dollars per share)	$ 0.35		$ (0.57)		$ 0.32		$ 0.34		$ 0.16		$ 0.04		$ (0.09)		$ 0.18		$ 0.44		$ 0.29		$ (0.03)
Diluted Earnings Per Share [Abstract]
Net earnings (loss) attributable to Modine	$ 17.6	[1]	$ (28.3)	[1]	$ 15.9	[1]	$ 17	[1]	$ 8	[2]	$ 1.7	[2]	$ (4.1)	[2]	$ 8.6	[2]	$ 22.2	[1]	$ 14.2	[2]	$ (1.6)
Less: Undistributed earnings attributable to unvested shares																	(0.1)		(0.1)		0
Net earnings (loss) available to Modine shareholders																	$ 22.1		$ 14.1		$ (1.6)
Weighted-average shares outstanding - basic (in shares)																	49.9		47.8		47.3
Effect of dilutive securities (in shares)																	1		0.5		0
Weighted-average shares outstanding - diluted (in shares)																	50.9		48.3		47.3
Net earnings (loss) per share - diluted (in dollars per share)	$ 0.34		$ (0.57)		$ 0.31		$ 0.34		$ 0.16		$ 0.04		$ (0.09)		$ 0.18		$ 0.43		$ 0.29		$ (0.03)
Potential dilutive securities (in shares)																					0.4
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earning per share (in shares)																	0.2		0.8		0.8
[1]	During fiscal 2018, restructuring expenses totaled $1.7 million, $0.4 million, $9.4 million, and $4.5 million for the quarters ended June 30, 2017, September 30, 2017, December 31, 2017, and March 31, 2018, respectively (see Note 5). During the third quarter of fiscal 2018, the Company recorded a $1.3 million asset impairment charge related to a manufacturing facility in Austria (see Note 5). During the fourth quarter of fiscal 2018, the Company recorded a $1.2 million impairment charge related to intangible assets (see Note 12). During fiscal 2018, costs directly related to the acquisition and integration of Luvata HTS totaled $1.6 million, $1.1 million, $1.0 million, and $0.6 million for the quarters ended June 30, 2017, September 30, 2017, December 31, 2017, and March 31, 2018, respectively (see Note 2). The Company recorded charges totaling $35.7 million and $2.3 million resulting for certain income tax effects of recently-enacted U.S. tax legislation in the quarters ended December 31, 2017 and March 31, 2018, respectively (see Note 7). During the fourth quarter of fiscal 2018, the Company reversed a portion of a valuation allowance related to a foreign tax jurisdiction, and, as a result, recorded an income tax benefit of $2.8 million (see Note 7).
[2]	During fiscal 2017, restructuring expenses totaled $2.3 million, $2.1 million, $1.6 million, and $4.9 million for the quarters ended June 30, 2016, September 30, 2016, December 31, 2016, and March 31, 2017, respectively (see Note 5). During fiscal 2017, the Company sold two previously-closed manufacturing facilities in its Americas segment and a facility in its Europe segment and recognized net gains totaling $1.2 million and $0.8 million in the quarters ended September 30, 2016 and March 31, 2017, respectively. During fiscal 2017, costs directly related to the acquisition and integration of Luvata HTS totaled $1.4 million, $3.0 million, $7.2 million, and $3.2 million for the quarters ended June 30, 2016, September 30, 2016, December 31, 2016, and March 31, 2017, respectively (see Note 2). During the fourth quarter of fiscal 2017, the Company recorded a deferred tax valuation allowance related to a foreign tax jurisdiction, and, as a result, recorded income tax expense of $2.0 million (see Note 7).

Inventories (Details)

Inventories (Details) - USD ($) $ in Millions	Mar. 31, 2018	Mar. 31, 2017
Inventories [Abstract]
Raw materials	$ 114.5	$ 100.2
Work in process	34.8	27.5
Finished goods	42.1	40.8
Total inventories	$ 191.3	$ 168.5

Property, Plant and Equipment75

Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 1,302.2	$ 1,177.6
Less: accumulated depreciation	(797.9)	(718.6)
Net property, plant and equipment	504.3	459
Depreciation expense	67	54.2	$ 48.6
Loss from disposition of property, plant and equipment	(0.7)	(0.4)	$ (0.4)
Land [Member]
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	22.6	18.9
Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 295.6	255.6
Buildings and Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, depreciable lives	10 years
Buildings and Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, depreciable lives	40 years
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 840.8	755.5
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, depreciable lives	3 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, depreciable lives	12 years
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 93	92.5
Office Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, depreciable lives	3 years
Office Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, depreciable lives	10 years
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 50.2	$ 55.1

Investment in Affiliate (Detail

Investment in Affiliate (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Schedule of Equity Method Investments [Line Items]
Equity in earnings of non-consolidated affiliate	$ 0.2	$ 0.1	$ 0.1
Nikkei Heat Exchanger Company, Ltd. [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, percent owned	50.00%
Equity method investment	$ 3.6	3.3
Equity in earnings of non-consolidated affiliate	$ 0.2	$ 0.1	$ 0.1

Intangible Assets (Details)

Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Amortized intangible assets [Abstract]
Gross carrying value	$ 150	$ 150	$ 145.9
Accumulated amortization	(20.1)	(20.1)	(11.8)
Net intangible assets	129.9	129.9	134.1
Amortization expense		9.7	4.1	$ 1.6
2,019	9	9
2,020	9	9
2,021	9	9
2,022	9	9
2,023	9	9
BHVAC [Member]
Amortized intangible assets [Abstract]
Impairment charge	1.2
BHVAC [Member] | Maximum [Member]
Amortized intangible assets [Abstract]
Annual revenue for discontinued product	1
Customer Relationships [Member]
Amortized intangible assets [Abstract]
Gross carrying value	64.2	64.2	60.5
Accumulated amortization	(5.7)	(5.7)	(1.7)
Net intangible assets	58.5	58.5	58.8
Trade Names [Member]
Amortized intangible assets [Abstract]
Gross carrying value	60.6	60.6	58.4
Accumulated amortization	(10.8)	(10.8)	(7.2)
Net intangible assets	49.8	49.8	51.2
Acquired Technology [Member]
Amortized intangible assets [Abstract]
Gross carrying value	25.2	25.2	27
Accumulated amortization	(3.6)	(3.6)	(2.9)
Net intangible assets	$ 21.6	$ 21.6	$ 24.1

Goodwill (Details)

Goodwill (Details) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Goodwill [Roll Forward]
Beginning balance		$ 165.1	$ 15.8
Acquired goodwill	[1]	1.3	150.6
Effect of exchange rate changes		7.4	(1.3)
Ending balance		173.8	165.1
Asia [Member]
Goodwill [Roll Forward]
Beginning balance		0.5	0.5
Acquired goodwill	[1]	0	0
Effect of exchange rate changes		0	0
Ending balance		0.5	0.5
BHVAC [Member]
Goodwill [Roll Forward]
Beginning balance		13.7	15.3
Acquired goodwill	[1]	0	0
Effect of exchange rate changes		1.3	(1.6)
Ending balance		15	13.7
CIS [Member]
Goodwill [Roll Forward]
Beginning balance		150.9	0
Acquired goodwill	[1]	1.3	150.6
Effect of exchange rate changes		6.1	0.3
Ending balance		158.3	150.9
Americas [Member]
Goodwill [Roll Forward]
Accumulated impairment losses		31.6	31.6
Europe [Member]
Goodwill [Roll Forward]
Accumulated impairment losses		$ 8.7	$ 8.7
[1]	See Note 2 for additional information about the goodwill recorded as a result of the acquisition of Luvata HTS.

Product Warranties, Operating79

Product Warranties, Operating Leases, and Other Commitments (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018		Mar. 31, 2017	Mar. 31, 2016
Changes in accrued warranty costs [Roll Forward]
Beginning balance	$ 10		$ 8.3
Warranties recorded at time of sale	6.7		5.2
Adjustments to pre-existing warranties	(0.8)		0.3
Additions and adjustments due to acquisition	(1)	[1]	4.1
Settlements	(6.2)		(7.6)
Effect of exchange rate changes	0.6		(0.3)
Ending balance	9.3		10	$ 8.3
Rental expense	18.5		$ 12.8	$ 11.9
Future minimum rental commitments under non-cancelable operating leases [Abstract]
2,019	14.4
2,020	12
2,021	10.4
2,022	7.1
2,023	6.6
2024 and beyond	24.6
Total future minimum rental commitments	75.1
Other Commitments [Line Items]
Capital expenditure commitments	$ 24.1
Minimum [Member]
Product Warranty Liability [Line Items]
Product warranty period	1 year
Other Commitments [Line Items]
Indemnification period	1 year
Maximum [Member]
Product Warranty Liability [Line Items]
Product warranty period	5 years
Other Commitments [Line Items]
Indemnification period	15 years
[1]	During fiscal 2018, the Company decreased its liability for product warranties by $1.0 million as a result of measurement period adjustments made in connection with purchase accounting for the acquisition of Luvata HTS. See Note 2 for additional information.

Indebtedness (Details)

Indebtedness (Details) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Long-term Debt and Capital Lease Obligations [Abstract]
Total debt		$ 431.6	$ 444.2
Less: current portion		(39.9)	(31.8)
Less: unamortized debt issuance costs		(5.4)	(6.7)
Total long-term debt		386.3	405.7
Maturities of long term debt and capital lease obligations [Abstract]
2,019		39.9
2,020		47.2
2,021		102.5
2,022		193.9
2,023		8.8
2024 & beyond		39.3
Total debt		431.6	444.2
Short-term debt		53.2	73.4
Long-term debt, fair value		153.1	170
Credit Facility [Abstract]
Available for future borrowings		170.3
Revolving Credit Facility [Member]
Maturities of long term debt and capital lease obligations [Abstract]
Short-term debt		$ 21.3	40.4
Revolving Credit Facility [Member] | Minimum [Member]
Credit Facility [Abstract]
Basis spread on variable rate		1.375%
Revolving Credit Facility [Member] | Maximum [Member]
Credit Facility [Abstract]
Basis spread on variable rate		2.50%
Revolving Credit Facility [Member] | Weighted Average [Member]
Credit Facility [Abstract]
Weighted-average interest rate		3.30%
Domestic Revolving Credit Facility [Member]
Credit Facility [Abstract]
Available for future borrowings		$ 150.6
Letters of credit outstanding		3.1
Foreign Credit Agreements [Member]
Maturities of long term debt and capital lease obligations [Abstract]
Short-term debt		31.9	33
Credit Facility [Abstract]
Available for future borrowings		19.7
Multi Currency Revolving Credit Facility [Member]
Credit Facility [Abstract]
Maximum borrowing capacity		$ 175
Expiration date		Nov. 30, 2021
Term Loan [Member]
Long-term Debt and Capital Lease Obligations [Abstract]
Total debt		$ 267.8	268.9
Fiscal year of maturity		Mar. 31, 2022
Maturities of long term debt and capital lease obligations [Abstract]
Total debt		$ 267.8	268.9
Term Loan [Member] | Minimum [Member]
Credit Facility [Abstract]
Basis spread on variable rate		1.375%
Term Loan [Member] | Maximum [Member]
Credit Facility [Abstract]
Basis spread on variable rate		2.50%
Term Loan [Member] | Weighted Average [Member]
Credit Facility [Abstract]
Weighted-average interest rate		3.30%
6.8% Senior Notes [Member]
Long-term Debt and Capital Lease Obligations [Abstract]
Interest rate percentage		6.80%
Total debt		$ 101	117
Fiscal year of maturity		Mar. 31, 2021
Maturities of long term debt and capital lease obligations [Abstract]
Total debt		$ 101	117
5.8% Senior Notes [Member]
Long-term Debt and Capital Lease Obligations [Abstract]
Interest rate percentage		5.80%
Total debt		$ 50	50
Fiscal year of maturity		Mar. 31, 2027
Maturities of long term debt and capital lease obligations [Abstract]
Total debt		$ 50	50
Other [Member]
Long-term Debt and Capital Lease Obligations [Abstract]
Total debt	[1]	$ 12.8	8.3
Fiscal year of maturity	[1]	Mar. 31, 2032
Maturities of long term debt and capital lease obligations [Abstract]
Total debt	[1]	$ 12.8	$ 8.3
[1]	Other long-term debt includes borrowings by foreign subsidiaries, capital lease obligations and other financing-type obligations.

Pension and Employee Benefit 81

Pension and Employee Benefit Plans, Defined Contribution Employee Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan cost recognized	$ 5.2	$ 4.7	$ 4.6
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Company match	4.50%

Pension and Employee Benefit 82

Pension and Employee Benefit Plans, Defined Benefit Employee Benefit Plans (Details) $ in Millions		12 Months Ended
		Mar. 31, 2018USD ($)	Mar. 31, 2017USD ($)	Mar. 31, 2016USD ($)Participant
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	[1]	$ 3.3	$ 2.9	$ 44.6
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions		16	9.5
Net periodic benefit cost		4.1	3.7	45.4
Pension Plans [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions		13.4	8.1	$ 6.7
Voluntary Lump Sum Payout Program [Abstract]
Number of participants accepted lump-sum payout program | Participant				2,000
Amount paid for settlement lump-sum payout program				$ 65.3
Pension Plans [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions		2.6	1.4	1.2
Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost		$ 0.2	$ 0.3	$ 0.3
[1]	Represents net periodic benefit cost, exclusive of service cost, for the Company's pension and postretirement plans.

Pension and Employee Benefit 83

Pension and Employee Benefit Plans, Changes in Benefit Obligations, Plan Assets, and Funded Status (Details) - Pension Plans [Member] - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018		Mar. 31, 2017		Mar. 31, 2016
Change in benefit obligation [Roll Forward]
Benefit obligation at beginning of year	$ 269.8		$ 261
Service cost	0.5		0.6		$ 0.6
Interest cost	9.9		9.8		11.2
Actuarial loss (gain)	4.4		(0.5)
Benefits paid	(16.9)		(19.8)
Curtailment gain	(0.3)	[1]	0
Acquired obligations	0		20.3	[2]
Effect of exchange rate changes	6.2		(1.6)
Benefit obligation at end of year	273.6		269.8		261
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	148.2		141.5
Actual return on plan assets	10.4		11
Benefits paid	(16.9)		(19.8)
Employer contributions	16		9.5
Acquired plan assets	0		6	[2]
Fair value of plan assets at end of year	157.7		148.2		$ 141.5
Funded status at end of year	(115.9)		(121.6)
Amounts recognized in the consolidated balance sheets [Abstract]
Current liability	(6.3)		(2.2)
Noncurrent liability	(109.6)		(119.4)
Total liability	(115.9)		(121.6)
Pension plans with accumulated benefit obligations in excess of plan assets [Abstract]
Accumulated benefit obligation	271.8		266.8
Amounts recognized in accumulated other comprehensive loss [Abstract]
Net actuarial loss (gain)	$ 157.9		$ 156.8
[1]	During the third quarter of fiscal 2018, the Company recorded a pension curtailment gain associated with the closure of a manufacturing facility in Austria (CIS segment). See Note 5 for additional information regarding the closure of this facility.
[2]	In fiscal 2017, as a result of its acquisition of Luvata HTS, the Company acquired pension plans in Italy, Austria and the U.S. See Note 2 for additional information regarding this acquisition.

Pension and Employee Benefit 84

Pension and Employee Benefit Plans, Cost Components of Pension Plans (Details) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2018		Mar. 31, 2017	Mar. 31, 2016
Components of net periodic benefit cost [Abstract]
Net periodic benefit cost	[1]	$ 3.3		$ 2.9	$ 44.6
Other changes in benefit obligation recognized in other comprehensive income (loss) [Abstract]
Amortization of net actuarial loss	[2]	(5.6)		(5.2)
Pension Plans [Member]
Components of net periodic benefit cost [Abstract]
Service cost		0.5		0.6	0.6
Interest cost		9.9		9.8	11.2
Expected return on plan assets		(11.9)		(12.3)	(14.9)
Amortization of net actuarial loss		5.6		5.6	6.4
Settlements		0.3		0	42.1	[3]
Curtailment gain		(0.3)	[4]	0	0
Net periodic benefit cost		4.1		3.7	45.4
Other changes in benefit obligation recognized in other comprehensive income (loss) [Abstract]
Net actuarial loss		(5.8)		(1)	(17.5)
Amortization of net actuarial loss		5.9		5.6	48.5	[3]
Total recognized in other comprehensive income (loss)		0.1		$ 4.6	$ 31
Reversal of amortization items [Abstract]
Estimated net actuarial loss that will be amortized		$ (5.6)
[1]	Represents net periodic benefit cost, exclusive of service cost, for the Company's pension and postretirement plans.
[2]	Amounts are included in the calculation of net periodic benefit cost for the Company's defined benefit plans, which include pension and other postretirement plans. See Note 16 for additional information about the Company's pension plans.
[3]	During fiscal 2016, in connection with lump-sum payouts to pension plan participants, the Company recorded $42.1 million of settlement losses, which were previously recorded in accumulated other comprehensive loss.
[4]	During the third quarter of fiscal 2018, the Company recorded a pension curtailment gain associated with the closure of a manufacturing facility in Austria (CIS segment). See Note 5 for additional information regarding the closure of this facility.

Pension and Employee Benefit 85

Pension and Employee Benefit Plans, Valuation Assumptions (Details) - Pension Plans [Member]	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
U.S. Plans [Member]
Weighted-average assumptions used in calculating benefit obligation [Abstract]
Discount rate - benefit obligations	4.00%	4.10%
Weighted-average assumptions used in calculating plan cost [Abstract]
Weighted average discount rate - costs	4.10%	4.10%	4.30%
Foreign Plan [Member]
Weighted-average assumptions used in calculating benefit obligation [Abstract]
Discount rate - benefit obligations	1.70%	1.70%
Weighted-average assumptions used in calculating plan cost [Abstract]
Weighted average discount rate - costs	1.90%	1.70%	1.30%

Pension and Employee Benefit 86

Pension and Employee Benefit Plans, Weighted-average Asset Allocations (Details) - Pension Plans [Member] - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Plan, Information about Plan Assets [Abstract]
Target allocation	100.00%
Plan assets	100.00%	100.00%
Anticipated contributions for 2019 fiscal year	$ 6
Equity Securities [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Target allocation	60.00%
Plan assets	58.00%	58.00%
Debt Securities [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Target allocation	38.00%
Plan assets	38.00%	38.00%
Cash and Cash Equivalents [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Target allocation	2.00%
Plan assets	4.00%	4.00%
U.S. Plans [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Expected return on plan assets	7.50%	8.00%	8.00%
Expected return on plan assets for next fiscal year	7.50%

Pension and Employee Benefit 87

Pension and Employee Benefit Plans, Estimated Pension Benefit Payments (Details) - Pension Plans [Member] $ in Millions	Mar. 31, 2018USD ($)
Estimated future benefit payments [Abstract]
2,019	$ 20.4
2,020	16.5
2,021	17
2,022	17.2
2,023	17.4
2024-2028	$ 85.2

Derivative Instruments (Details

Derivative Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2018	Mar. 31, 2017
Commodity Derivatives [Member] | Derivatives Designated as Hedges [Member] | Other Current Assets [Member]
Derivative instruments [Abstract]
Derivative asset, fair value, net	$ 0.1	$ 0
Commodity Derivatives [Member] | Derivatives not Designated as Hedges [Member] | Other Current Assets [Member]
Derivative instruments [Abstract]
Derivative asset, fair value, net	0	0.7
Commodity Derivatives [Member] | Derivatives not Designated as Hedges [Member] | Other Current Liabilities [Member]
Derivative instruments [Abstract]
Derivative liability, fair value, net	0.2	0
Foreign Exchange Contracts [Member] | Derivatives Designated as Hedges [Member] | Other Current Assets [Member]
Derivative instruments [Abstract]
Derivative asset, fair value, net	0.1	0
Foreign Exchange Contracts [Member] | Derivatives not Designated as Hedges [Member] | Other Current Assets [Member]
Derivative instruments [Abstract]
Derivative asset, fair value, net	0.2	0.2
Foreign Exchange Contracts [Member] | Derivatives not Designated as Hedges [Member] | Other Current Liabilities [Member]
Derivative instruments [Abstract]
Derivative liability, fair value, net	$ 0.6	$ 0

Derivative Instruments, (Gain)

Derivative Instruments, (Gain) Loss by Hedging Relationship, by Income Statement Location (Details) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Derivative Instruments, (Gain) Loss [Line Items]
Reclassified gains from foreign exchange contracts to net sales	[1]	$ 0.1
Non-Designated Derivative [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Total gains (losses)		(0.2)	$ 1.8	$ (0.1)
Commodity Derivatives [Member] | Other Comprehensive Income (Loss) [Member] | Designated [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Total gains (losses)		0.2
Commodity Derivatives [Member] | Cost of Sales [Member] | Non-Designated Derivative [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Total gains (losses)		0.4	0.5	(0.7)
Foreign Exchange Contracts [Member] | Other Comprehensive Income (Loss) [Member] | Designated [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Total gains (losses)		0.1
Foreign Exchange Contracts [Member] | Net Sales [Member] | Non-Designated Derivative [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Total gains (losses)		(0.1)	0	0
Foreign Exchange Contracts [Member] | Other Income (Expense) - Net [Member] | Non-Designated Derivative [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Total gains (losses)		$ (0.5)	$ 1.3	$ 0.6
[1]	Amounts reclassified to net earnings. See Note 17 for additional information regarding derivative instruments.

Contingencies and Litigation (D

Contingencies and Litigation (Details) $ in Millions	12 Months Ended
	Mar. 31, 2018USD ($)FacilityCustomer	Mar. 31, 2017USD ($)Customer	Mar. 31, 2016Customer
Concentration Risk [Line Items]
Number of major customers | Customer	2	2	2
Number of top customers | Customer	10
U.S. [Member]
Site Contingency [Line Items]
Number of manufacturing facilities | Facility	2
CADE [Member]
Legal Matters [Abstract]
Brazil legal matter - accrual		$ 4.7
Litigation settlement amount	$ 4.7
Closed and Sold Manufacturing Facility [Member]
Site Contingency [Line Items]
Reserves for environmental matters	$ 16.7	$ 16.8
Closed and Sold Manufacturing Facility [Member] | U.S. [Member]
Site Contingency [Line Items]
Number of manufacturing facilities | Facility	1
Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	48.00%	54.00%	63.00%
Credit Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	36.00%	35.00%

Accumulated Other Comprehensi91

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Loss [Line Items]
Beginning balance		$ 414
Other comprehensive income (loss) before reclassifications		35.9	$ (11.1)
Reclassifications for amortization of unrecognized net loss	[1]	5.6	5.2
Reclassifications of realized gains	[2]	(0.1)
Income taxes		0.1	(1.7)
Total other comprehensive income (loss)		41.5	(7.6)
Ending balance		490.1	414
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Loss [Line Items]
Beginning balance		(181.8)	(174.2)
Ending balance		(140.3)	(181.8)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Loss [Line Items]
Beginning balance		(46.8)	(36)
Other comprehensive income (loss) before reclassifications		41.3	(10.8)
Reclassifications for amortization of unrecognized net loss	[1]	0	0
Reclassifications of realized gains	[2]	0
Income taxes		0	0
Total other comprehensive income (loss)		41.3	(10.8)
Ending balance		(5.5)	(46.8)
Defined Benefit Plans [Member]
Accumulated Other Comprehensive Loss [Line Items]
Beginning balance		(135)	(138.2)
Other comprehensive income (loss) before reclassifications		(5.7)	(0.3)
Reclassifications for amortization of unrecognized net loss	[1]	5.6	5.2
Reclassifications of realized gains	[2]	0
Income taxes		0.2	(1.7)
Total other comprehensive income (loss)		0.1	3.2
Ending balance		(134.9)	(135)
Cash Flow Hedges [Member]
Accumulated Other Comprehensive Loss [Line Items]
Beginning balance		0
Other comprehensive income (loss) before reclassifications		0.3
Reclassifications for amortization of unrecognized net loss	[1]	0
Reclassifications of realized gains	[2]	(0.1)
Income taxes		(0.1)
Total other comprehensive income (loss)		0.1
Ending balance		$ 0.1	$ 0
[1]	Amounts are included in the calculation of net periodic benefit cost for the Company's defined benefit plans, which include pension and other postretirement plans. See Note 16 for additional information about the Company's pension plans.
[2]	Amounts reclassified to net earnings. See Note 17 for additional information regarding derivative instruments.

Segment and Geographic Inform92

Segment and Geographic Information, Net Sales, Gross Profit, and Operating Income by Segment (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2018		Mar. 31, 2017		Mar. 31, 2016
Net sales, gross profit, operating income and total assets by segment [Abstract]
Net sales	$ 566.6	$ 512.7	$ 508.3	$ 515.5	$ 488.3	$ 349.8	$ 317.7	$ 347.2	$ 2,103.1		$ 1,503		$ 1,352.5
Gross profit	96.5	85.4	86.1	88.5	85.1	59	48	62.3	$ 356.5		$ 254.4		$ 233.6
Gross profit (% of sales)									17.00%		16.90%		17.30%
Operating income									$ 92.2		$ 42.3		$ 37.1
Acquisition and integration related costs	$ 0.6	$ 1	$ 1.1	$ 1.6	$ 3.2	$ 7.2	$ 3	$ 1.4
Luvata HTS [Member]
Net sales, gross profit, operating income and total assets by segment [Abstract]
Acquisition and integration related costs									4.3		14.8
Luvata HTS [Member] | Selling, General and Administrative Expenses [Member]
Net sales, gross profit, operating income and total assets by segment [Abstract]
Acquisition and integration related costs									4.3		14.8
Operating Segments [Member]
Net sales, gross profit, operating income and total assets by segment [Abstract]
Net sales									2,126		1,519.1		1,370
Gross profit									$ 356.1		$ 261.1		$ 236.2
Gross profit (% of sales)									16.80%		17.20%		17.20%
Operating income									$ 135.5		$ 94.5		$ 66.3
Operating Segments [Member] | Americas [Member]
Net sales, gross profit, operating income and total assets by segment [Abstract]
Net sales									580.7		534		585.5
Gross profit									$ 91.9		$ 87		$ 100.3
Gross profit (% of sales)									15.80%		16.30%		17.10%
Operating income									$ 38.2		$ 27.9		$ 36.9
Operating Segments [Member] | Europe [Member]
Net sales, gross profit, operating income and total assets by segment [Abstract]
Net sales									568.3		524.3		524.1
Gross profit									$ 83.8		$ 81.6		$ 69.5
Gross profit (% of sales)									14.70%		15.60%		13.30%
Operating income									$ 33.6		$ 38.2		$ 14.7
Operating Segments [Member] | Asia [Member]
Net sales, gross profit, operating income and total assets by segment [Abstract]
Net sales									165.8		111.5		79
Gross profit									$ 30.3		$ 18.7		$ 12.2
Gross profit (% of sales)									18.30%		16.80%		15.50%
Operating income									$ 17.6		$ 7.7		$ 0.8
Operating Segments [Member] | CIS [Member]
Net sales, gross profit, operating income and total assets by segment [Abstract]
Net sales									620		177.7		0
Gross profit									$ 92.1		$ 26		$ 0
Gross profit (% of sales)									14.90%		14.60%		0.00%
Operating income									$ 25.8		$ 7.5		$ 0
Operating Segments [Member] | BHVAC [Member]
Net sales, gross profit, operating income and total assets by segment [Abstract]
Net sales									191.2		171.6		181.4
Gross profit									$ 58		$ 47.8		$ 54.2
Gross profit (% of sales)									30.30%		27.80%		29.90%
Operating income									$ 20.3		$ 13.2		$ 13.9
Corporate and Eliminations [Member]
Net sales, gross profit, operating income and total assets by segment [Abstract]
Net sales									(22.9)		(16.1)		(17.5)
Gross profit									$ 0.4	[1]	$ (6.7)	[1]	$ (2.6)
Gross profit (% of sales)									0.00%	[1]	0.00%	[1]	0.00%
Operating income									$ (43.3)	[1]	$ (52.2)	[1]	$ (29.2)
Corporate and Eliminations [Member] | Cost of Sales [Member]
Net sales, gross profit, operating income and total assets by segment [Abstract]
Inventory purchase accounting adjustment											$ 4.3
[1]	During fiscal 2018 and 2017, the Company recorded $4.3 million and $14.8 million, respectively, of costs incurred directly related to the acquisition and integration of Luvata HTS within SG&A expenses at Corporate. During fiscal 2017, the Company recorded $4.3 million in cost of sales related to an inventory purchase accounting adjustment at Corporate, as the impact was excluded from the Company's measure of segment operating performance.

Segment and Geographic Inform93

Segment and Geographic Information, Total Assets by Segment (Details) - USD ($) $ in Millions		Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Total assets		$ 1,573.4	$ 1,449.5
Operating Segments [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Total assets		290.6	282.9
Operating Segments [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Total assets		324	269.4
Operating Segments [Member] | Asia [Member]
Segment Reporting Information [Line Items]
Total assets		144.5	111.3
Operating Segments [Member] | CIS [Member]
Segment Reporting Information [Line Items]
Total assets		630	576
Operating Segments [Member] | BHVAC [Member]
Segment Reporting Information [Line Items]
Total assets		88.1	85.2
Corporate and Eliminations [Member]
Segment Reporting Information [Line Items]
Total assets	[1]	$ 96.2	$ 124.7
[1]	The decrease in total assets at Corporate was primarily due to a decrease in deferred tax assets resulting from the impact of tax reform in the U.S. See Note 7 for additional information regarding the reduction in the corporate tax rate in the U.S.

Segment and Geographic Inform94

Segment and Geographic Information, Capital Expenditures and Depreciation and Amortization Expense by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Total capital expenditures	$ 71	$ 64.4	$ 62.8
Total depreciation and amortization expense	76.7	58.3	50.2
Operating Segments [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Total capital expenditures	22.2	26.3	26.7
Total depreciation and amortization expense	22.2	22.7	22.1
Operating Segments [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Total capital expenditures	26.8	24.7	24.8
Total depreciation and amortization expense	18.4	16.5	18
Operating Segments [Member] | Asia [Member]
Segment Reporting Information [Line Items]
Total capital expenditures	12.4	8.5	6.2
Total depreciation and amortization expense	7.6	7	6.5
Operating Segments [Member] | CIS [Member]
Segment Reporting Information [Line Items]
Total capital expenditures	9	3.4	0
Total depreciation and amortization expense	24.3	7.9	0
Operating Segments [Member] | BHVAC [Member]
Segment Reporting Information [Line Items]
Total capital expenditures	0.6	1.5	5.1
Total depreciation and amortization expense	$ 4.2	$ 4.2	$ 3.6

Segment and Geographic Inform95

Segment and Geographic Information, Net Sales by Geographical Area (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 566.6	$ 512.7	$ 508.3	$ 515.5	$ 488.3	$ 349.8	$ 317.7	$ 347.2	$ 2,103.1	$ 1,503	$ 1,352.5
Reportable Geographical Components [Member] | United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									911.4	657.8	627.6
Reportable Geographical Components [Member] | Italy [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									211.5	94.4	44.1
Reportable Geographical Components [Member] | China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									156	73.7	29.3
Reportable Geographical Components [Member] | Hungary [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									153.9	145.6	145.9
Reportable Geographical Components [Member] | Austria [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									151.7	125.2	113.1
Reportable Geographical Components [Member] | Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									132.6	130.1	155.3
Reportable Geographical Components [Member] | Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									$ 386	$ 276.2	$ 237.2

Segment and Geographic Inform96

Segment and Geographic Information, Property, Plant and Equipment by Geographical Area (Details) - USD ($) $ in Millions	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information, Additional Information [Abstract]
Total property, plant and equipment	$ 504.3	$ 459
Reportable Geographical Components [Member] | United States [Member]
Segment Reporting Information, Additional Information [Abstract]
Total property, plant and equipment	121.5	124.7
Reportable Geographical Components [Member] | Italy [Member]
Segment Reporting Information, Additional Information [Abstract]
Total property, plant and equipment	62	55.8
Reportable Geographical Components [Member] | Hungary [Member]
Segment Reporting Information, Additional Information [Abstract]
Total property, plant and equipment	59.3	37.7
Reportable Geographical Components [Member] | China [Member]
Segment Reporting Information, Additional Information [Abstract]
Total property, plant and equipment	49.6	40
Reportable Geographical Components [Member] | Mexico [Member]
Segment Reporting Information, Additional Information [Abstract]
Total property, plant and equipment	49.4	47
Reportable Geographical Components [Member] | Austria [Member]
Segment Reporting Information, Additional Information [Abstract]
Total property, plant and equipment	42.8	44.3
Reportable Geographical Components [Member] | Germany [Member]
Segment Reporting Information, Additional Information [Abstract]
Total property, plant and equipment	37.2	28.9
Reportable Geographical Components [Member] | Other [Member]
Segment Reporting Information, Additional Information [Abstract]
Total property, plant and equipment	$ 82.5	$ 80.6

Segment and Geographic Inform97

Segment and Geographic Information, Net sales by End Market (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Revenue from External Customer [Line Items]
Net sales	$ 2,103.1	$ 1,503	$ 1,352.5
Automotive [Member]
Revenue from External Customer [Line Items]
Net sales	526	461	396.8
Commercial Vehicle [Member]
Revenue from External Customer [Line Items]
Net sales	381.7	382.5	459.8
Off-Highway [Member]
Revenue from External Customer [Line Items]
Net sales	271.2	202.8	206.2
Other Vehicular [Member]
Revenue from External Customer [Line Items]
Net sales	61.9	55.8	57.6
Commercial & Residential Air Conditioning [Member]
Revenue from External Customer [Line Items]
Net sales	371.3	136.5	48.8
Commercial Refrigeration [Member]
Revenue from External Customer [Line Items]
Net sales	158.7	52.2	0
Other HVAC&R [Member]
Revenue from External Customer [Line Items]
Net sales	$ 332.3	$ 212.2	$ 183.3

Quarterly Financial Data (Una98

Quarterly Financial Data (Unaudited) (Details) $ / shares in Units, $ in Millions	3 Months Ended																12 Months Ended
	Mar. 31, 2018USD ($)$ / shares		Dec. 31, 2017USD ($)$ / shares		Sep. 30, 2017USD ($)$ / shares		Jun. 30, 2017USD ($)$ / shares		Mar. 31, 2017USD ($)$ / shares		Dec. 31, 2016USD ($)$ / shares		Sep. 30, 2016USD ($)$ / shares		Jun. 30, 2016USD ($)$ / shares		Mar. 31, 2018USD ($)$ / shares		Mar. 31, 2017USD ($)Facility$ / shares		Mar. 31, 2016USD ($)$ / shares
Selected quarterly financial information [Abstract]
Net sales	$ 566.6		$ 512.7		$ 508.3		$ 515.5		$ 488.3		$ 349.8		$ 317.7		$ 347.2		$ 2,103.1		$ 1,503		$ 1,352.5
Gross profit	96.5		85.4		86.1		88.5		85.1		59		48		62.3		356.5		254.4		233.6
Net earnings (loss)	18	[1]	(27.9)	[1]	16.3	[1]	17.4	[1]	8.1	[2]	1.9	[2]	(4)	[2]	8.9	[2]	23.8	[1]	14.9	[2]
Net earnings (loss) attributable to Modine	$ 17.6	[1]	$ (28.3)	[1]	$ 15.9	[1]	$ 17	[1]	$ 8	[2]	$ 1.7	[2]	$ (4.1)	[2]	$ 8.6	[2]	$ 22.2	[1]	$ 14.2	[2]	$ (1.6)
Net (loss) earnings per share attributable to Modine shareholders:
Basic (in dollars per share) | $ / shares	$ 0.35		$ (0.57)		$ 0.32		$ 0.34		$ 0.16		$ 0.04		$ (0.09)		$ 0.18		$ 0.44		$ 0.29		$ (0.03)
Diluted (in dollars per share) | $ / shares	$ 0.34		$ (0.57)		$ 0.31		$ 0.34		$ 0.16		$ 0.04		$ (0.09)		$ 0.18		$ 0.43		$ 0.29		$ (0.03)
Restructuring expenses	$ 4.5		$ 9.4		$ 0.4		$ 1.7		$ 4.9		$ 1.6		$ 2.1		$ 2.3		$ 16		$ 10.9		$ 16.6
Gain on sale of assets									0.8				1.2				0		2		0
Acquisition- and integration-related costs	0.6		1		$ 1.1		$ 1.6		3.2		$ 7.2		$ 3		$ 1.4
Impairment charges	1.2		1.3														2.5		$ 0		9.9
Number of closed manufacturing facilities sold | Facility																			2
Quarterly Financial Information [Line Items]
Provisional discrete tax charges																	38
Provision (benefit) for income taxes																	$ 39.5		$ 5.9		$ (8.9)
United States [Member]
Quarterly Financial Information [Line Items]
Provisional discrete tax charges	2.3		$ 35.7
Foreign Tax Jurisdictions [Member]
Quarterly Financial Information [Line Items]
Valuation allowance - deferred tax assets change in amount	$ (2.8)								$ 2
[1]	During fiscal 2018, restructuring expenses totaled $1.7 million, $0.4 million, $9.4 million, and $4.5 million for the quarters ended June 30, 2017, September 30, 2017, December 31, 2017, and March 31, 2018, respectively (see Note 5). During the third quarter of fiscal 2018, the Company recorded a $1.3 million asset impairment charge related to a manufacturing facility in Austria (see Note 5). During the fourth quarter of fiscal 2018, the Company recorded a $1.2 million impairment charge related to intangible assets (see Note 12). During fiscal 2018, costs directly related to the acquisition and integration of Luvata HTS totaled $1.6 million, $1.1 million, $1.0 million, and $0.6 million for the quarters ended June 30, 2017, September 30, 2017, December 31, 2017, and March 31, 2018, respectively (see Note 2). The Company recorded charges totaling $35.7 million and $2.3 million resulting for certain income tax effects of recently-enacted U.S. tax legislation in the quarters ended December 31, 2017 and March 31, 2018, respectively (see Note 7). During the fourth quarter of fiscal 2018, the Company reversed a portion of a valuation allowance related to a foreign tax jurisdiction, and, as a result, recorded an income tax benefit of $2.8 million (see Note 7).
[2]	During fiscal 2017, restructuring expenses totaled $2.3 million, $2.1 million, $1.6 million, and $4.9 million for the quarters ended June 30, 2016, September 30, 2016, December 31, 2016, and March 31, 2017, respectively (see Note 5). During fiscal 2017, the Company sold two previously-closed manufacturing facilities in its Americas segment and a facility in its Europe segment and recognized net gains totaling $1.2 million and $0.8 million in the quarters ended September 30, 2016 and March 31, 2017, respectively. During fiscal 2017, costs directly related to the acquisition and integration of Luvata HTS totaled $1.4 million, $3.0 million, $7.2 million, and $3.2 million for the quarters ended June 30, 2016, September 30, 2016, December 31, 2016, and March 31, 2017, respectively (see Note 2). During the fourth quarter of fiscal 2017, the Company recorded a deferred tax valuation allowance related to a foreign tax jurisdiction, and, as a result, recorded income tax expense of $2.0 million (see Note 7).

SCHEDULE II - VALUATION AND Q99

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - Valuation Allowance for Deferred Tax Assets [Member] - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		$ 49.6	$ 50.8	$ 48
Additions Charged (Benefit) to Costs and Expenses		(6.7)	(0.3)	1.5
Additions Charged to Other Accounts	[1]	6	(0.9)	1.3
Balance at End of Period		$ 48.9	$ 49.6	$ 50.8
[1]	Foreign currency translation, increases due to the acquisition of Luvata HTS and other adjustments