Zurn Elkay Water Solutions (ZWS) 10-K 20 May 15 2015 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	15-May-15	Sep. 30, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	REXNORD CORPORATION
Entity Central Index Key	1439288
Document Type	10-K
Document Period End Date	31-Mar-15
Amendment Flag	FALSE
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	-28
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		101,816,857
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$2,422

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Mar. 31, 2014
In Millions, unless otherwise specified
Current assets:
Cash and cash equivalents	$370.30	$339
Receivables, net	336	368.3
Inventories, net	367.7	359.7
Assets held for sale	2.6	17.8
Other current assets	49.7	53.8
Total current assets	1,126.30	1,138.60
Property, plant and equipment, net	417.6	423.1
Intangible assets, net	587.7	592.6
Goodwill	1,202.30	1,150.70
Insurance for asbestos claims	35	36
Other assets	43.6	42.5
Total assets	3,412.50	3,383.50
Current liabilities:
Current maturities of debt	24.3	29
Trade payables	234.1	241.1
Compensation and benefits	53.9	61.4
Current portion of pension and postretirement benefit obligations	5	5.8
Other current liabilities	127.3	112.2
Total current liabilities	444.6	449.5
Long-term debt	1,926.20	1,943
Pension and postretirement benefit obligations	203	147.7
Deferred income taxes	184.4	207.1
Reserve for asbestos claims	35	36
Other liabilities	66.6	38.1
Total liabilities	2,859.80	2,821.40
Stockholders' equity:
Preferred stock, $0.01 par value; 10,000,000 shares authorized; none issued	0	0
Common stock, $0.01 par value; 200,000,000 shares authorized; shares issued: 102,681,964 at March 31, 2015 and 102,055,058 at March 31, 2014	1	1
Additional paid-in capital	885.9	872.7
Retained deficit	-197.5	-281.3
Accumulated other comprehensive loss	-130.2	-23.8
Treasury stock at cost; 900,904 shares at March 31, 2015 and March 31, 2014	-6.3	-6.3
Total Rexnord stockholders' equity	552.9	562.3
Non-controlling interest	-0.2	-0.2
Total stockholders' equity	552.7	562.1
Total liabilities and stockholders' equity	$3,412.50	$3,383.50

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2015	Mar. 31, 2014
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$0.01	$0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	102,681,964	102,055,058
Preferred stock, par value (in dollars per share)	$0.01	$0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Treasury stock, shares	900,904	900,904

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	12 Months Ended
In Millions, except Share data in Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
Net sales	$2,050.20	$2,034.30	$1,943.50
Cost of sales	1,304	1,280.90	1,226.90
Gross profit	746.2	753.4	716.6
Selling, general and administrative expenses	415.1	419.1	398.4
Zurn PEX loss contingency	0	0	10.1
Restructuring and other similar charges	12.9	8.4	8.6
Actuarial loss on pension and postretirement benefit obligations	59.4	2.7	5.5
Amortization of intangible assets	55.1	50.8	51.1
Income from operations	203.7	272.4	242.9
Non-operating expense:
Interest expense, net	-87.9	-109.1	-153.3
Loss on the extinguishment of debt	0	-133.2	-24
Other expense, net	-7.2	-15.1	-2.9
Income from continuing operations before income taxes	108.6	15	62.7
Provision (benefit) for income taxes	16.8	-10	15.4
Net income from continuing operations	91.8	25	47.3
(Loss) gain from discontinued operations, net of tax	-8	4.6	2.8
Net income	83.8	29.6	50.1
Non-controlling interest loss	0	-0.6	0
Net income attributable to Rexnord	$83.80	$30.20	$50.10
Net income per share from continuing operations:
Basic (in dollars per share)	$0.90	$0.25	$0.49
Diluted (in dollars per share)	$0.88	$0.25	$0.47
Net (loss) income per share from discontinued operations:
Basic (in dollars per share)	($0.08)	$0.05	$0.03
Diluted (in dollars per share)	($0.08)	$0.05	$0.03
Net income per share attributable to Rexnord:
Basic (in dollars per share)	$0.82	$0.31	$0.52
Diluted (in dollars per share)	$0.80	$0.30	$0.50
Weighted-average number of shares outstanding (in thousands):
Basic (in dollars per share)	101,530	98,105	95,972
Effect of dilutive stock options (in dollars per share)	3,197	3,213	3,894
Diluted (in dollars per share)	104,727	101,318	99,866

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive (Loss) Income (USD $)	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Consolidated Statements of Comprehensive Income [Abstract]
Net income attributable to Rexnord	$83.80	$30.20	$50.10
Other comprehensive income (loss):
Foreign currency translation adjustments	-84.3	7.1	-14.3
Unrealized loss on interest rate derivatives, net of tax	-10.9	-1.7	0
Change in pension and other postretirement defined benefit plans, net of tax	-11.2	9.5	-13.1
Other comprehensive (loss) income, net of tax	-106.4	14.9	-27.4
Non-controlling interest loss	0	-0.6	0
Total comprehensive (loss) income	($22.60)	$44.50	$22.70

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholders' Equity (USD $)	Total	Common Stock	Preferred Stock	Additional Paid-In Capital	Retained (Deficit) Earnings	Accumulated Other Comprehensive (Loss) Income	Treasury Stock	Non-controlling interest
In Millions, unless otherwise specified
Beginning balance at Mar. 31, 2012	($80.80)	$0.70	$0	$298.60	($361.60)	($11.30)	($6.30)	($0.90)	[1]
Comprehensive income (loss):
Net income (loss)	50.1	0	0	0	50.1	0	0	0	[1]
Foreign currency translation adjustments	-14.3	0	0	0	0	-14.3	0	0	[1]
Change in pension and other post retirement defined benefit plans, net of income tax expense (benefit)	-13.1	0	0	0	0	-13.1	0	0	[1]
Total comprehensive income (loss)	22.7	0	0	0	50.1	-27.4	0	0	[1]
Stock-based compensation expense	7.1	0	0	7.1	0	0	0	0	[1]
Issuance of common stock, net of direct offering costs	458.3	0.3	0	458	0	0	0	0	[1]
Exercise of stock options, net of shares surrendered	2	0	0	2	0	0	0	0	[1]
Acquisition of non-controlling interest	1.1	0	0	0.2	0	0	0	0.9	[1]
Tax benefit on stock option exercises	18.1	0	0	18.1	0	0	0	0	[1]
Ending balance at Mar. 31, 2013	428.5	1	0	784	-311.5	-38.7	-6.3	0	[1]
Comprehensive income (loss):
Net income (loss)	29.6	0	0	0	30.2	0	0	-0.6	[1]
Foreign currency translation adjustments	7.1	0	0	0	0	7.1	0	0	[1]
Unrealized loss on interest rate derivatives, net of income tax expense (benefit)	-1.7	0	0	0	0	-1.7	0	0	[1]
Change in pension and other post retirement defined benefit plans, net of income tax expense (benefit)	9.5	0	0	0	0	9.5	0	0	[1]
Total comprehensive income (loss)	44.5	0	0	0	30.2	14.9	0	-0.6	[1]
Stock-based compensation expense	7	0	0	7	0	0	0	0	[1]
Issuance of equity to non-controlling interest holders	0.4	0	0	0	0	0	0	0.4	[1]
Issuance of common stock, net of direct offering costs	73.8	0	0	73.8	0	0	0	0	[1]
Exercise of stock options, net of shares surrendered	2.1	0	0	2.1	0	0	0	0	[1]
Tax benefit on stock option exercises	5.8	0	0	5.8	0	0	0	0	[1]
Ending balance at Mar. 31, 2014	562.1	1	0	872.7	-281.3	-23.8	-6.3	-0.2	[1]
Comprehensive income (loss):
Net income (loss)	83.8	0	0	0	83.8	0	0	0	[1]
Foreign currency translation adjustments	-84.3	0	0	0	0	-84.3	0	0	[1]
Unrealized loss on interest rate derivatives, net of income tax expense (benefit)	-10.9	0	0	0	0	-10.9	0	0	[1]
Change in pension and other post retirement defined benefit plans, net of income tax expense (benefit)	-11.2	0	0	0	0	-11.2	0	0	[1]
Total comprehensive income (loss)	-22.6	0	0	0	83.8	-106.4	0	0	[1]
Stock-based compensation expense	6.3	0	0	6.3	0	0	0	0	[1]
Exercise of stock options, net of shares surrendered	1.1	0	0	1.1	0	0	0	0	[1]
Tax benefit on stock option exercises	5.8	0	0	5.8	0	0	0	0	[1]
Ending balance at Mar. 31, 2015	$552.70	$1	$0	$885.90	($197.50)	($130.20)	($6.30)	($0.20)	[1]
[1]	(1) Fiscal 2012 represents a 20% non-controlling interest formerly held by a local director of VAG-Valves India Private Limited. In fiscal 2013, the Company purchased that interest. Fiscal 2014 represents a 49% non-controlling interest in a Water Management joint venture.

Consolidated_Statements_of_Sto1

Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
		Rate
Statement of Stockholders' Equity [Abstract]
Non-controlling interest percentage		49.00%
Income tax expense (benefit) on unrealized (gain) loss on interest rate derivatives	($4.20)	($1)
Income tax (expense) benefit on change in pension and other post retirement defined benefit plans	$4.30	($4.90)	$6.90

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Operating activities
Net income	$83.80	$29.60	$50.10
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	57.1	56.1	59.8
Amortization of intangible assets	55.1	50.8	51.1
Amortization of deferred financing costs	2.1	2.6	3.9
Loss (gain) on dispositions of property, plant and equipment	3	2.3	-3.6
Deferred income taxes	-36.9	-27.6	-20.9
Non-cash charge for disposal of discontinued operations	9.7	0	0
Actuarial loss on pension and post retirement benefit obligations	59.4	2.7	5.5
Other non-cash (credits) charges	-9.8	-0.1	7.3
Loss on extinguishment of debt	0	133.2	24
Stock-based compensation expense	6.4	7	7.1
Changes in operating assets and liabilities:
Receivables	6.1	-11.3	-20.3
Inventories	-15.2	-11.3	-12.8
Other assets	0.1	-6.8	7.5
Accounts payable	3.7	26	-4.3
Accruals and other	21.3	-62.4	-9.9
Cash provided by operating activities	245.9	190.8	144.5
Investing activities
Expenditures for property, plant and equipment	-48.8	-52.2	-60.1
Acquisitions, net of cash acquired	-138.2	-112	-21
Loan receivable for financing under New Market Tax Credit incentive program	0	0	-9.7
Proceeds from dispositions of property, plant and equipment	0.5	0.4	6.7
Proceeds from divestiture, net of cash	9.2	0	2.3
Cash used for investing activities	-177.3	-163.8	-81.8
Financing activities
Proceeds from borrowings of long-term debt	0.1	1,935.10	15.4
Repayments of long-term debt	-19.8	-1,948.40	-313.2
Proceeds from borrowings of short-term debt	11.5	13.5	12.6
Repayments of short-term debt	-16.1	-165.6	-8.2
Payment of deferred financing fees	0	-17.1	-2
Payment of tender premium	0	-109.9	-17.6
Proceeds from issuance of common stock, net of direct offering costs	0	73.8	458.3
Proceeds from exercise of stock options	1.1	2.1	2.3
Third party investment in non-controlling interest	0	0.4	0
Excess tax benefit on exercise of stock options	5.8	5.8	18.1
Cash (used for) provided by financing activities	-17.4	-210.3	165.7
Effect of exchange rate changes on cash and cash equivalents	-19.9	-1.8	-2.3
Increase (decrease) in cash and cash equivalents	31.3	-185.1	226.1
Cash and cash equivalents at beginning of period	339	524.1	298
Cash and cash equivalents at end of period	$370.30	$339	$524.10

Basis_of_Presentation_and_Desc

Basis of Presentation and Description of Business	12 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Description of Business	Basis of Presentation and Description of Business
	The consolidated financial statements included herein have been prepared by Rexnord Corporation (“Rexnord” or the "Company"), in accordance with accounting principles generally accepted in the United States ("GAAP") pursuant to the rules and regulations of the Securities and Exchange Commission. The consolidated financial statements include the accounts of the Company and its subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. In the opinion of management, the consolidated financial statements include all adjustments necessary for a fair presentation of the financial position and the results of operations for the periods presented.
	During fiscal 2015, the Company completed a plan to discontinue the operations and exit its non-core business that manufactures ring gears and pinions (“Mill Products”) utilized for crushing machinery applications in the mining sector. Accordingly, the results of operations of the Mill Products business have been reported as discontinued operations in the Consolidated Statements of Operations for all periods presented. The corresponding assets and liabilities of the discontinued operations have been reclassified in accordance with authoritative literature and classified as Assets held for sale for all periods presented in the Consolidated Balance Sheets. The Consolidated Statements of Cash Flows for the fiscal years ended March 31, 2015, 2014 and 2013 have not been adjusted to separately disclose cash flows related to discontinued operations. See Note 4 for further information regarding the discontinued operation.
	The Company
	Rexnord is a growth-oriented, multi-platform industrial company with what it believes are leading market shares and highly trusted brands that serve a diverse array of global end-markets. The Company's heritage of innovation and specification have allowed it to provide highly engineered, mission critical solutions to customers for decades and affords it the privilege of having long-term, valued relationships with market leaders. The Rexnord Innovation Center provides on-going, cross-platform support of these capabilities.
	The Process & Motion Control platform designs, manufactures, markets and services specified, highly-engineered mechanical components used within complex systems where our customers' reliability requirements and cost of failure or downtime is extremely high. The Process & Motion Control product portfolio includes gears and gear drives, couplings, industrial bearings, tabletop and engineered chain, aerospace bearings and seals, conveying equipment and specialty components, as well as, repair and on-going service.
	The Water Management platform designs, procures, manufactures and markets products that provide and enhance water quality, safety, flow control and conservation. The Water Management product portfolio includes specification drainage systems, sensor flush valves and faucets, point-source wastewater pretreatment devices, backflow prevention devices, pressure release valves, sluice and slide gates, butterfly and plug valves, control valves and actuation systems and PEX piping.

Significant_Accounting_Policie

Significant Accounting Policies	12 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Significant Accounting Policies	Significant Accounting Policies
	Use of Estimates
	The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates.
	Reclassifications
	Certain prior year amounts have been reclassified to conform to the fiscal 2015 presentation.
	Revenue Recognition
	Net sales are recorded upon transfer of title and risk of product loss to the customer. Net sales relating to any particular shipment are based upon the amount invoiced for the delivered goods less estimated future rebate payments and sales returns which are based upon the Company’s historical experience. Revisions to these estimates are recorded in the period in which the facts that give rise to the revision become known. The value of returned goods during the years ended March 31, 2015, 2014 and 2013 was approximately 1.0% or less of net sales. Other than a standard product warranty, there are no post-shipment obligations.
	The Company classifies shipping and handling fees billed to customers as net sales and the corresponding costs are classified as cost of sales in the consolidated statements of operations.
	Stock Based Compensation
	The Company accounts for stock based compensation in accordance with Accounting Standards Codification ("ASC") 718, Accounting for Stock Compensation ("ASC 718"). ASC 718 requires compensation costs related to stock-based payment transactions to be recognized in the financial statements. Generally, compensation cost is measured based on the grant-date fair value of the equity instruments issued. Compensation cost is recognized over the requisite service period, generally as the awards vest. See further discussion of the Company’s equity plans in Note 15.
	Per Share Data
	Basic net income (loss) per share from continuing and discontinued operations is computed by dividing net income from continuing operations and (loss) income from discontinued operations, respectively, by the corresponding weighted average number of common shares outstanding for the period. Diluted net income (loss) per share from continuing and discontinued operations is computed based on the weighted average number of common shares outstanding increased by the number of incremental shares that would have been outstanding if the potential dilutive shares were issued through the exercise of outstanding stock options to purchase common shares, except when the effect would be anti-dilutive. The computation for diluted net income (loss) per share for the fiscal year ended March 31, 2015, 2014 and 2013 excludes 1,268,623, 1,278,316 and 2,924,547 shares due to their anti-dilutive effects, respectively.
	Cash and Cash Equivalents
	The Company considers all highly liquid investments with a maturity of three months or less to be cash and cash equivalents.
	Receivables
	Receivables are stated net of allowances for doubtful accounts of $16.8 million at March 31, 2015 and $6.4 million at March 31, 2014. The Company evaluates the collectability of its receivables and establishes the allowance for doubtful accounts based on a combination of specific customer circumstances and historical write-off experience. Credit is extended to customers based upon an evaluation of their financial position. Generally, advance payment is not required. Allowances for doubtful accounts established are recorded within Selling, general and administrative expenses within the Consolidated Statements of Operations.
	Since the Company's fiscal 2012 acquisition of VAG Holdings, GmbH "("VAG"), the Company has delivered multiple water infrastructure projects to a long-standing state-owned water utility customer located in Venezuela (transactions were denominated in Euros). While the Company continued to receive payments from the customer during fiscal 2015, the Company experienced a general slowdown in cash collections which can primarily be attributed to constrained sovereign liquidity and foreign currency controls resulting from the increased political, civil and economic instability in Venezuela. During the fourth quarter of fiscal 2015, the Company established a reserve of approximately $9.1 million for all outstanding receivables related to this long-standing customer as of March 31, 2015.
	Significant Customers
	The Company’s largest customer accounted for 8.9%, 7.8% and 7.4% of consolidated net sales for the years ended March 31, 2015, 2014 and 2013, respectively. Receivables related to this Process & Motion Control industrial distributor at March 31, 2015 and 2014 were $10.2 million and $9.8 million, respectively.
	Inventories
	Inventories are comprised of material, direct labor and manufacturing overhead, and are stated at the lower of cost or market. Market is determined based on estimated net realizable values. Approximately 61% of the Company’s total inventories as of both March 31, 2015 and 2014 were valued using the “last-in, first-out” (LIFO) method. All remaining inventories are valued using the “first-in, first-out” (FIFO) method.
	In some cases, the Company has determined a certain portion of inventories are excess or obsolete. In those cases, the Company writes down the value of those inventories to their net realizable value based upon assumptions about future demand and market conditions. If actual market conditions are less favorable than those projected by management, additional inventory write-downs may be required. The total write-down of inventories charged to expense was $5.2 million, $3.8 million and $4.9 million, during fiscal 2015, 2014 and 2013, respectively.
	Property, Plant and Equipment
	Property, plant and equipment are stated at cost. Depreciation is provided using the straight-line method over 10 to 30 years for buildings and improvements, 5 to 10 years for machinery and equipment and 3 to 5 years for computer hardware and software. Maintenance and repair costs are expensed as incurred.
	Goodwill and Intangible Assets
	Intangible assets consist of acquired trademarks and tradenames, customer relationships (including distribution network) and patents. The customer relationships, patents, and certain tradenames are being amortized using the straight-line method over their estimated useful lives of 1 to 20 years, 2 to 15 years, and 5 to 10 years, respectively. Goodwill, trademarks and certain tradenames have indefinite lives and are not amortized but are tested annually for impairment using a discounted cash flow and market value approach analysis.
	Impairment of Long-Lived Assets
	The carrying value of long-lived assets, including amortizable intangible assets and tangible fixed assets, are evaluated for impairment whenever events or changes in circumstances indicate that the related carrying amounts may not be recoverable. Impairment of amortizable intangible assets and tangible fixed assets is generally determined by comparing projected undiscounted cash flows to be generated by the asset, or group of assets, to its carrying value. If impairment is identified, a loss is recorded equal to the excess of the asset's net book value over its fair value, and the cost basis is adjusted. Determination of the fair value requires various estimates including internal cash flow estimates generated from the asset, quoted market prices and appraisals as appropriate to determine fair value. Actual results could vary from these estimates.
	Deferred Financing Costs
	Other assets at March 31, 2015 and 2014, include deferred financing costs of $9.9 million and $12.1 million, respectively, net of accumulated amortization of $6.8 million and $4.7 million, respectively. These costs were incurred to obtain long-term financing and are being amortized using the effective interest method over the term of the related debt. See Note 11 for further information on the Company's long-term financing.
	Product Warranty
	The Company offers warranties on the sales of certain of its products and records an accrual for estimated future claims. Such accruals are based upon historical experience and management’s estimate of the level of future claims. The following table presents changes in the Company’s product warranty liability during each of the periods presented (in millions):
		Year Ended March 31, 2015			Year Ended March 31, 2014			Year Ended March 31, 2013
	Balance at beginning of period	$	8		$	7.7		$	7.7
	Acquired obligations	—			0.2			—
	Charged to operations	1.8			3.9			3.6
	Claims settled	(3.0		)	(3.8		)	(3.6		)
	Balance at end of period	$	6.8		$	8		$	7.7
	Income Taxes
	The Company accounts for income taxes in accordance with ASC 740, Accounting for Income Taxes (“ASC 740”). Deferred income taxes are provided for future tax effects attributable to temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases, net operating losses, tax credits and other applicable carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be actually paid or recovered. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in the results of continuing operations in the period that includes the date of enactment.
	The Company regularly reviews its deferred tax assets for recoverability and provides a valuation allowance against its deferred tax assets if, based upon consideration of all positive and negative evidence, the Company determines that it is more-likely-than-not that a portion or all of the deferred tax assets will ultimately not be realized in future tax periods. Such positive and negative evidence would include review of historical earnings and losses, anticipated future earnings, the time period over which the temporary differences and carryforwards are anticipated to reverse and implementation of feasible, prudent tax planning strategies.
	The Company is subject to income taxes in the United States and numerous foreign jurisdictions. Significant judgment is required in determining the Company's worldwide provision for income taxes and recording the related deferred tax assets and liabilities. In the ordinary course of the Company's business, there is inherent uncertainty in quantifying the ultimate tax outcome of all of the numerous transactions and required calculations relating to the Company's tax positions. Accruals for unrecognized tax benefits are provided for in accordance with the requirements of ASC 740. An unrecognized tax benefit represents the difference between the recognition of benefits related to uncertain tax positions for income tax reporting purposes and financial reporting purposes. The Company has established a reserve for interest and penalties, as applicable, for uncertain tax positions and it is recorded as a component of the overall income tax provision.
	The Company is subject to periodic income tax examinations by domestic and foreign income tax authorities. Although the outcome of income tax examinations is always uncertain, the Company believes that it has appropriate support for the positions taken on its income tax returns and has adequately provided for potential income tax assessments. Nonetheless, the amounts ultimately settled relating to issues raised by the taxing authorities may differ materially from the amounts accrued for each year.
	See Note 17 for more information on income taxes.
	Accumulated Other Comprehensive Loss
	At March 31, 2015, accumulated other comprehensive loss consisted of $76.5 million of foreign currency translation losses, $12.6 million, net of tax, of unrealized losses on interest rate derivatives, and $41.1 million, net of tax, of unrecognized actuarial losses and unrecognized prior services costs. At March 31, 2014, accumulated other comprehensive loss consisted of $7.8 million of foreign currency translation gains, $1.7 million, net of tax, of unrealized losses on interest rate derivatives, and $29.9 million, net of tax, of unrecognized actuarial losses and unrecognized prior services costs.
	The changes in accumulated other comprehensive loss, net of tax, for the fiscal years ending March 31, 2015, 2014 and 2013 are as follows (in millions):
		Interest Rate Derivatives			Foreign Currency Translation			Pension and Postretirement Plans			Total
	Balance April 1, 2012	$	—		$	15		$	(26.3	)	$	(11.3	)
	Other comprehensive loss before reclassifications	—			(14.3		)	(12.2		)	(26.5		)
	Amounts reclassified from accumulated other comprehensive loss	—			—			(0.9		)	(0.9		)
	Net current period other comprehensive loss	—			(14.3		)	(13.1		)	(27.4		)
	Balance at March 31, 2013	—			0.7			(39.4		)	(38.7		)
	Balance April 1, 2013	—			0.7			(39.4		)	(38.7		)
	Other comprehensive (loss) income before reclassifications	(1.7		)	7.1			10.5			15.9
	Amounts reclassified from accumulated other comprehensive loss	—			—			(1.0		)	(1.0		)
	Net current period other comprehensive (loss) income	(1.7		)	7.1			9.5			14.9
	Balance at March 31, 2014	(1.7		)	7.8			(29.9		)	(23.8		)
	Balance April 1, 2014	(1.7		)	7.8			(29.9		)	(23.8		)
	Other comprehensive loss before reclassifications	(10.9		)	(84.3		)	(14.1		)	(109.3		)
	Amounts reclassified from accumulated other comprehensive loss	—			—			2.9			2.9
	Net current period other comprehensive loss	(10.9		)	(84.3		)	(11.2		)	(106.4		)
	Balance at March 31, 2015	$	(12.6	)	$	(76.5	)	$	(41.1	)	$	(130.2	)
	The following table summarizes the amounts reclassified from accumulated other comprehensive loss to net income during the fiscal years ending March 31, 2015, 2014 and 2013 (in millions):
Pension and postretirement plans	Year Ending March 31, 2015			Year Ending March 31, 2014			Year Ending March 31, 2013			Income Statement Line Item
Amortization of prior service credit	$	(1.7	)	$	(1.7	)	$	(1.4	)	Selling, general and administrative expenses
Lump Sum Settlement	6.5			—			—			Actuarial loss on pension and postretirement benefit obligations
(Benefit) provision for income taxes	(1.9		)	0.7			0.5
Total, net of income taxes	$	2.9		$	(1.0	)	$	(0.9	)
Derivative Financial Instruments
The Company is exposed to certain financial risks relating to fluctuations in foreign currency exchange rates and interest rates. The Company selectively uses foreign currency forward contracts and interest rate derivatives to manage its foreign currency and interest rate risks. All hedging transactions are authorized and executed pursuant to defined policies and procedures which prohibit the use of financial instruments for speculative purposes.
The Company accounts for derivative instruments in accordance with ASC 815, Accounting for Derivative Instruments and Hedging Activities (“ASC 815”). ASC 815 requires companies to recognize all of its derivative instruments as either assets or liabilities in the balance sheet at fair value. Fair value is defined under ASC 820, Fair Value Measurements and Disclosures (“ASC 820”), as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants. See more information as it relates to applying fair value to derivative instruments at Note 13. The accounting for changes in the fair value of a derivative instrument depends on whether the derivative instrument has been designated and qualifies as part of a hedging relationship and further, on the type of hedging relationship. As of March 31, 2015, the Company had forward-starting interest rate swaps and interest rate caps on its variable rate term debt that are designated and qualify as hedging instruments. For the derivative instruments designated and qualifying as effective hedging instruments under ASC 815, the changes in the fair value of the effective portion of the instrument are recognized in accumulated other comprehensive loss whereas any changes in the fair value of a derivative instrument that is not designated or does not qualify as an effective hedge are recorded in other non-operating expense. See Note 12 for further information regarding the classification and accounting for the Company’s derivative financial instruments.
Financial Instrument Counterparties
The Company is exposed to credit losses in the event of non-performance by counterparties to its financial instruments. The Company anticipates, however, that counterparties will be able to fully satisfy their obligations under these instruments. The Company places cash and temporary investments and foreign currency and interest rate swap and cap contracts with various high-quality financial institutions. Although the Company does not obtain collateral or other security to support these financial instruments, it does periodically evaluate the credit-worthiness of each of its counterparties.
Foreign Currency Translation
Assets and liabilities of subsidiaries operating outside of the United States with a functional currency other than the U.S. dollar are translated into U.S. dollars using exchange rates at the end of the respective period. Revenues and expenses of such entities are translated at average exchange rates in effect during the respective period. Foreign currency translation adjustments are included as a component of accumulated other comprehensive loss. Currency transaction losses are included in other expense, net in the consolidated statements of operations and totaled $1.5 million, $3.9 million and $6.8 million for the years ended March 31, 2015, 2014 and 2013, respectively.
Advertising Costs
Advertising costs are charged to selling, general and administrative expenses as incurred and amounted to $10.4 million, $9.6 million, and $10.0 million for the years ended March 31, 2015, 2014 and 2013, respectively.
Research, Development and Engineering Costs
Research, development and engineering costs are charged to selling, general and administrative expenses as incurred and for the years ended March 31, 2015, 2014 and 2013 amounted to the following (in millions):
	Year Ended March 31, 2015			Year Ended March 31, 2014			Year Ended March 31, 2013
Research and development costs	$	12.8		$	13		$	13.7
Engineering costs	26			28.4			24.3
Total	$	38.8		$	41.4		$	38
Concentrations of Credit Risk
Financial instruments that potentially subject the Company to significant concentrations of credit risk consist of cash and temporary investments, forward currency contracts and trade accounts receivable.
Recent Accounting Pronouncements
In March 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-08, Presentation of Financial Statements and Property, Plant, and Equipment: Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity ("ASU 2014-08"), which changes the criteria for reporting discontinued operations. ASU 2014-08 allows only disposals representing a strategic shift in operations to be presented as discontinued operations. Those strategic shifts should have a major effect on the organization’s operations and financial results. In addition, the new guidance requires expanded disclosures about discontinued operations, as well as pre-tax income attributable to a disposal of a significant part of an organization that does not qualify for discontinued operations reporting. ASU 2014-08 will be effective for the Company in the first quarter of fiscal 2016. As this guidance is a prospective change, adoption of this standard is not expected to have a material impact on the Company's results of operations, financial position or cash flows.
In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers in order to develop a common revenue standard for U.S. GAAP and International Financial Reporting Standards. The guidance specifies revenue should be recognized in the amount that reflects the consideration the company expects to be entitled to in exchange for the transfer of promised goods or services to customers. ASU 2014-09 will be effective for the Company in the first quarter of fiscal 2017 and allows for full retrospective adoption applied to all periods presented or retrospective adoption with the cumulative effect of initially applying this update recognized at the date of initial application. The Company is currently evaluating the method of adoption and the potential impact adoption will have on its consolidated financial statements.
In April 2015, the FASB issued ASU No. 2015-03, Simplifying the Presentation of Debt Issuance Costs ("ASU 2015-03"). ASU 2015-03 requires debt issuance costs related to a recognized debt liability to be presented in the balance sheet as a direct deduction from the debt liability rather than as an asset. ASU 2015-03 will be effective for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. The Company is currently evaluating the impact adoption of this standard will have on its consolidated financial statements.

Acquisitions

Acquisitions	12 Months Ended
	Mar. 31, 2015
Business Combinations [Abstract]
Acquisitions	Acquisitions
	Fiscal Year 2015
	On January 12, 2015, the Company acquired Euroflex Transmissions (India) Private Limited ("Euroflex") for a total preliminary cash purchase price of $77.1 million, excluding transaction costs and net of cash acquired. Euroflex, based in Hyderabad, India, is a supplier of high performance disc couplings used in power generation, gas compression and industrial process machinery applications. The acquisition of Euroflex added complementary product lines to the Company's existing Process & Motion Control platform.
	On October 30, 2014, the Company acquired Tollok S.p.A. ("Tollok"), a supplier of highly engineered shaft locking devices for the power generation and process industries, as well as general industrial applications. The preliminary purchase price, excluding transaction costs and net of cash acquired, was $40.9 million. The purchase price is comprised of $33.4 million that was paid at closing and €4.0 million to be paid in two equal annual installments on October 30, 2015 and October 30, 2016. Pursuant to the terms of the agreement, the Company is also contingently obligated to make additional consideration payments, not to exceed €3.0 million, in two years to the sellers should Tollok's financial performance exceed certain thresholds during the two years following the acquisition. All future amounts due are denominated in Euros. Tollok, based in Ferrara, Italy, added complementary product lines to the Company's existing Process & Motion Control platform.
	On April 15, 2014, the Company acquired Green Turtle Technologies Ltd., Green Turtle Americas Ltd. and Filamat Composites Inc. (collectively "Green Turtle") for a total cash purchase price of $27.7 million, excluding transaction costs and net of cash acquired. Green Turtle, based in Toronto, Ontario, and Charlotte, North Carolina, is a manufacturer of branded fiberglass oil and grease separators and traps. This acquisition broadened the product portfolio of the Company's existing Water Management platform.
	The Company's results of operations include the acquired operations subsequent to the respective acquisition dates. The acquisitions of Green Turtle, Tollok and Euroflex were not material to the Company’s consolidated financial statements. Pro-forma results of operations and certain other U.S. GAAP disclosures related to the acquisitions during the year ended March 31, 2015 have not been presented because they are not significant to the Company's consolidated statements of operations and financial position.
	The fiscal 2015 acquisitions were accounted for as business combinations and recorded by allocating the purchase price of the acquisitions to the fair value of the assets acquired and liabilities assumed at the respective acquisition date. The excess of the acquisition purchase price over the fair value assigned to the assets acquired and liabilities assumed was recorded as goodwill. The initial purchase price allocations for these transactions resulted in non-tax deductible goodwill of $74.7 million, other intangible assets of $67.2 million and other net assets of $3.8 million. The purchase price allocations are preliminary and subject to final working capital and other valuation adjustments that will be completed within the one year period following the respective acquisition date.
	Fiscal Year 2014
	On December 16, 2013, the Company acquired Precision Gear Holdings, LLC (“PGH”) for a total cash purchase price of $77.1 million, net of cash acquired and excluding transaction costs. PGH has two operating subsidiaries, Merit Gear LLC (“Merit Gear”), located in Antigo, Wisconsin, and Precision Gear LLC (“Precision Gear”), located in Twinsburg, Ohio. Merit Gear is a build-to-print manufacturer of high-quality gearing and specialized gearboxes primarily for the North American oil and gas market, along with other diversified industrial markets. Precision Gear is a leading manufacturer of highly specialized gears primarily serving the aerospace market, along with various other industrial markets. This acquisition was complementary to the Company's existing Process & Motion Control product portfolio.
	On August 30, 2013, the Company acquired certain assets of L.W. Gemmell ("LWG") for a total cash purchase price of $8.2 million, excluding transactions costs. LWG, based in Australia, is a distributor of non-residential plumbing products. A portion of LWG's historical sales were from existing Rexnord Water Management product lines. As such, the acquisition provided the Company with additional product offerings and the opportunity to expand its international presence through a more direct ownership structure.
	On August 21, 2013, the Company acquired certain assets of Micro Precision Gear Technology Limited ("Micro Precision") for a total cash purchase price of $22.2 million, excluding transactions costs. Micro Precision, based in the United Kingdom, is a built-to-print manufacturer of specialty gears and electric motor components primarily sold to the aerospace market. This acquisition expanded the Company's existing Process & Motion Control product offerings and its presence in Europe.
	On April 26, 2013, the Company acquired Klamflex Pipe Couplings Ltd. ("Klamflex") for a total cash purchase price of $4.5 million, net of cash acquired and excluding transaction costs. Klamflex, based in South Africa, is a manufacturer of pipe couplings, flange adapters, dismantling joints and repair clamps. This acquisition broadened the product portfolio of the Company's existing Water Management platform and expanded the Company's global presence.
	The Company's results of operations include the acquired operations subsequent to the respective acquisition dates. The acquisitions of PGH, LWG, Micro Precision and Klamflex were not material to the Company’s consolidated financial statements, either individually or in the aggregate. Pro-forma results of operations and certain other U.S. GAAP disclosures related to the acquisitions during the fiscal year ended March 31, 2014 have not been presented because they are not significant to the Company's consolidated statements of operations and financial position, either individually or in the aggregate.
	The fiscal year 2014 acquisitions were accounted for as business combinations and recorded by allocating the purchase price of the acquisitions to the fair value of the assets acquired and liabilities assumed at the respective acquisition dates. The excess of the acquisition purchase price over the fair value assigned to the assets acquired and liabilities assumed was recorded as goodwill. During fiscal 2015, the Company adjusted the preliminary allocations for the Micro Precision and PGH purchase price, respectively, in connection with finalizing the valuation of each businesses' tradenames and the time period each tradename will be utilized by the Company post-acquisition. The opening balance sheet has been adjusted to reflect these changes, which included an increase to goodwill of $1.8 million and a net decrease to intangible assets of $1.8 million. The amortization expense recognized in historical periods was not materially impacted as a result of the adjustments to the purchase price allocations. The final aggregate purchase price allocation of these acquisitions resulted in goodwill of $26.7 million ($24.6 million of tax deductible goodwill), other intangible assets of $23.3 million, property, plant and equipment of $36.7 million and other net assets of $25.3 million.
	During fiscal 2014, the Company also established a new French sales office in its Water Management platform to expand its European water and wastewater market presence via a joint venture between the Company and six external sales associates. The Company contributed an immaterial amount of capital to the joint venture. As the Company has a 51% ownership stake and is deemed to have significant control over the new legal entity, the financial statements of the new joint venture have been wholly consolidated in accordance with ASC 810, Consolidations.  The remaining 49% of the joint venture that is not owned by the Company has been presented as a non-controlling interest throughout the consolidated financial statements.
	Fiscal Year 2013
	On December 13, 2012, the Company acquired Cline Acquisition Corp. ("Cline") for a total cash purchase price of $19.6 million, net of cash acquired and excluding transaction costs. Cline, based in Taylors, South Carolina, is a service business specializing in the manufacturing, repair and refurbishment of drive shafts, clutches and brakes. This acquisition was a product line extension of the Company's existing Process & Motion Control service offerings and expanded its presence in the southeast region of the U.S. As a result of this transaction, the Company acquired $21.8 million of intangible assets consisting of $12.2 million of goodwill (which is not deductible for tax purposes) and $9.6 million of all other intangible assets based on the Company's final purchase price allocation.
	During the third quarter of fiscal 2013, the Company completed the acquisition of a remaining minority interest in VAG-Valves India Private Limited and the acquisition of an independently owned VAG sales office in the United Kingdom for a cash purchase price of $1.4 million, net of cash acquired and excluding transactions costs.
	The Company's results of operations include the acquired operations subsequent to the respective acquisition dates. The acquisitions of Cline, VAG-Valves India Private Limited and the VAG sales office were not material to the Company’s consolidated financial statements, either individually or in the aggregate.

Discontinued_Operations

Discontinued Operations	12 Months Ended
	Mar. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	Discontinued Operations
	During the fourth quarter of fiscal 2015, the Company concluded its plan to discontinue the Mill Products business, which conducted its operations in the United States and Australia and was a component of the Process & Motion Control operating segment. Upon completing the manufacturing of all outstanding customer orders, the Company ceased all operations related to this business as of March 31, 2015. As a result of these events, the Company meets the criteria to present this business as a discontinued operation in accordance with the authoritative guidance. Accordingly, the results of operations of the Mill Products business have been reported as discontinued operations in the Consolidated Statements of Operations for all periods presented. The corresponding assets and liabilities of the discontinued operations have been reclassified in accordance with authoritative literature and classified as Assets held for sale for all periods presented in the Consolidated Balance Sheets. The Consolidated Statements of Cash Flows for the fiscal years ended March 31, 2015, 2014 and 2013 have not been adjusted to separately disclose cash flows related to discontinued operations.
	In exiting the Mill Products business, the Company agreed to sell certain assets associated with the business for aggregate cash consideration of approximately $9.2 million and the remaining assets and liabilities of the discontinued operation were adjusted to reflect their net realizable value. The exit of Mill Products resulted in the Company recording a net charge of $9.7 million, consisting of a $3.8 million impairment loss associated with property, plant and equipment, $4.1 million impairment of goodwill allocated to the discontinued operation and other exit related costs of $1.8 million.
	The following table summarizes the results of the Mill Products business included within (loss) income from discontinued operations, net of tax on the Consolidated Statements of Operations (in millions):
		Year Ended
		31-Mar-15			31-Mar-14		31-Mar-13
	Net sales	$	34.1		$	47.7	$	61.6
	(Loss) income from operations before income taxes	(10.9		)	7.2		12.5
	(Benefit) provision for income taxes	(2.9		)	2.6		4.9
	Net (loss) income	$	(8.0	)	$	4.6	$	7.6
	Net (loss) income per share from discontinued operations:
	Basic	$	(0.08	)	$	0.05	$	0.08
	Diluted	$	(0.08	)	$	0.05	$	0.08
	Included as Assets held for sale on the Consolidated Balance Sheets as of March 31, 2015 and March 31, 2014 are long-lived assets of the Mill Products business of $2.6 million and $17.8 million, respectively. As of March 31, 2015, the long-lived assets are recorded at the estimated fair value. See Note 13 for additional detail on fair value measurements used by the Company to estimate fair value. The Company is actively engaged in the sale of remaining assets; however, given the nature of the assets involved, the expected timing of cash flows related to the sale is indeterminable. As of March 31, 2015, the Company has $5.8 million of trade working capital, primarily trade receivables, that is expected to be monetized in the first quarter of fiscal 2016. As of March 31, 2015, the Company has no continuing involvement in the Mill Products business.
	During fiscal 2013, the Company completed the sale of a non-core engineered chain business located in Shanghai, China within the Process & Motion Control Platform for a total sale price of $2.5 million. The Company recorded a pre-tax loss on disposal of approximately $0.5 million during fiscal 2013. During fiscal 2013, the Company recorded a net loss from operations of $4.3 million. The loss from operations and the loss on disposal of this business are included within (loss) income from discontinued operations, net of tax on the Consolidated Statements of Operations.
	The combined fiscal 2013 results of Mill Products and the engineered chain business resulted in net income from discontinued operations, net of tax of $2.8 million. This translates into basic and diluted net income per share of $0.03.

Restructuring_and_Other_Simila

Restructuring and Other Similar Costs	12 Months Ended
	Mar. 31, 2015
Restructuring and Related Activities [Abstract]
Restructuring and Other Exit Costs	Restructuring and Other Similar Costs
	During fiscal 2015, the Company executed various restructuring actions. These initiatives were implemented to drive efficiencies and reduce operating costs while also modifying the Company's footprint to reflect changes in the markets it serves, the impact of acquisitions on its overall manufacturing capacity and the refinement of its overall product portfolio. These restructuring actions primarily resulted in workforce reductions, lease termination costs, and other facility rationalization costs. Management expects to continue executing initiatives to optimize its operating margin and manufacturing footprint. As such, the Company expects further expenses related to workforce reduction, lease termination, and other facility rationalization costs. The Company's restructuring plans are preliminary and related expenses are not yet estimateable.
	The following table summarizes the Company's restructuring and other similar costs incurred during the years ended March 31, 2015, 2014 and 2013 by classification of operating segment (in millions):
			Year Ended March 31, 2015
			Process & Motion Control			Water Management			Corporate			Consolidated
	Severance costs		$	7.6		$	3.3		$	—		$	10.9
	Lease termination and other costs		1.2			0.8			—			2
	Total restructuring and other similar costs		$	8.8		$	4.1		$	—		$	12.9
			Year Ended March 31, 2014
			Process & Motion Control			Water Management			Corporate			Consolidated
	Severance costs		$	3.3		$	2		$	0.8		$	6.1
	Lease termination and other costs		1.6			0.7			—			2.3
	Total restructuring and other similar costs		$	4.9		$	2.7		$	0.8		$	8.4
			Year Ended March 31, 2013
			Process & Motion Control			Water Management			Corporate			Consolidated
	Severance costs		$	5.3		$	1.5		$	—		$	6.8
	Lease termination and other costs		1.1			0.7			—			1.8
	Total restructuring and other similar costs		$	6.4		$	2.2		$	—		$	8.6
			Restructuring Costs To-date (Period from April 1, 2012 to March 31, 2015)
			Process & Motion Control			Water Management			Corporate			Consolidated
	Severance costs		$	16.2		$	6.8		$	0.8		$	23.8
	Lease termination and other costs		3.9			2.2			—			6.1
	Total restructuring and other similar costs		$	20.1		$	9		$	0.8		$	29.9
	The following table summarizes the activity in the Company's accrual for restructuring costs for the fiscal years ended March 31, 2015 and 2014 (in millions):
			Severance Costs			Lease Termination and Other Costs			Total
	Accrued Restructuring Costs, March 31, 2013		$	3.7		$	0.1		$	3.8
	Charges		6.1			2.3			8.4
	Cash payments		(6.4		)	(2.0		)	(8.4		)
	Accrued Restructuring Costs, March 31, 2014 (1)		3.4			0.4			3.8
	Charges		10.9			2			12.9
	Cash payments		(7.6		)	(1.3		)	(8.9		)
	Non-cash charges		—			(0.8		)	(0.8		)
	Accrued Restructuring Costs, March 31, 2015 (1)		$	6.7		$	0.3		$	7
	-1	Accrued restructuring costs are included in other current liabilities in the consolidated balance sheets.

Recovery_Under_Continued_Dumpi

Recovery Under Continued Dumping and Sudsidy Offset Act ("CDSOA")	12 Months Ended
	Mar. 31, 2015
Other Income and Expenses [Abstract]
Recovery Under Continued Dumping and Subsidy Offset Act (bCDSOAb)	Recovery Under Continued Dumping and Subsidy Offset Act (“CDSOA”)
	The Company, as a producer of ball bearing products in the U.S., participated in the distribution of monies collected by Customs and Border Protection (“CBP”) from anti-dumping cases under the CDSOA. Through its participation the Company provided relevant information to CBP regarding historical manufacturing, personnel and development costs for previous calendar years. In February 2006, U.S. legislation was enacted that ended CDSOA distributions to U.S. manufacturers for imports covered by anti-dumping duty orders entering the U.S. after September 30, 2007. Because monies were collected by CBP until September 30, 2007 and for prior year entries, the Company has received periodic recoveries.
	In connection with this program, beginning in 2006, CBP began to withhold amounts that would have otherwise been distributed as a result of pending litigation challenging past and future distributions and the administrative operation of the law. During fiscal 2013, CBP began to distribute these withheld funds to domestic producers. In connection with the distribution of these withheld funds, the Company recorded $16.6 million of income during fiscal 2013. The Company did not receive any distributions in fiscal 2014 or 2015. CDSOA recoveries are included in "Other expense, net" on the consolidated statements of operations for each respective fiscal year. As a result of still pending litigation, the Company cannot reasonably estimate the amount of CDSOA payments, if any, that it may receive in future years and/or whether it will be required to repay any previously received distributions.

Inventories

Inventories	12 Months Ended
	Mar. 31, 2015
Inventory Disclosure [Abstract]
Inventories	Inventories
	The major classes of inventories are summarized as follows (in millions):
		March 31,
		2015		2014
	Finished goods	$	146	$	148.4
	Work in progress	69.6		72.5
	Purchased components	85.2		75.8
	Raw materials	61.1		61.1
	Inventories at First-in, First-Out ("FIFO") cost	361.9		357.8
	Adjustment to state inventories at Last-in, First-Out ("LIFO") cost	5.8		1.9
		$	367.7	$	359.7

Property_Plant_and_Equipment

Property, Plant and Equipment	12 Months Ended
	Mar. 31, 2015
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Plant and Equipment
	Property, plant and equipment, net is summarized as follows (in millions):
		March 31,
		2015			2014
	Land	$	33.5		$	32.1
	Buildings and improvements	217.7			215.6
	Machinery and equipment	388.2			390.7
	Hardware and software	61.5			62.5
	Construction in-progress	25.9			23.5
		726.8			724.4
	Less accumulated depreciation	(309.2		)	(301.3		)
		$	417.6		$	423.1

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	12 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets
	The changes in the net carrying value of goodwill and identifiable intangible assets for the years ended March 31, 2015 and 2014 by operating segment, are presented below (in millions):
										Amortizable Intangible Assets
			Goodwill			Indefinite Lived Intangible Assets				Trade-Names			Customer Relationships			Patents			Total Identifiable Intangible Assets Excluding Goodwill
	Process & Motion Control
	Net carrying amount as of March 31, 2013		$	877.1		$	193.9			$	—		$	104.9		$	4.9		$	303.7
	Acquisitions		21.9			2.7				2			18.3			—			23
	Purchase price allocation adjustments		1.1			—				—			—			—
	Amortization		—			—				(0.1		)	(29.3		)	(1.2		)	(30.6		)
	Currency translation adjustment and other		3.9			1				—			0.5			—			1.5
	Net carrying amount as of March 31, 2014		$	904		$	197.6			$	1.9		$	94.4		$	3.7		$	297.6
	Acquisitions		54.7			—				5.2			51.6			—			56.8
	Purchase price allocation adjustments		1.8			(3.1		)		1.3			—			—			(1.8		)
	Amortization		—			—				(1.0		)	(31.0		)	(1.2		)	(33.2		)
	Currency translation adjustment and other (1)		(10.6		)	(1.6		)		(0.1		)	(2.0		)	—			(3.7		)
	Net carrying amount as of March 31, 2015		$	949.9		$	192.9			$	7.3		$	113		$	2.5		$	315.7
	Water Management
	Net carrying amount as of March 31, 2013		$	241.3		$	138.1			$	—		$	162.8		$	8.9		$	309.8
	Acquisitions		3			1.2				—			0.9			—			2.1
	Amortization		—			—				—			(18.4		)	(1.8		)	(20.2		)
	Currency translation adjustment and other		2.4			1.5				—			1.7			0.1			3.3
	Net carrying amount as of March 31, 2014		$	246.7		$	140.8			$	—		$	147		$	7.2		$	295
	Acquisitions		20			—				1.6			7.3			1.5			10.4
	Amortization		—			—				(0.2		)	(19.4		)	(2.3		)	(21.9		)
	Currency translation adjustment and other		(14.3		)	(5.6		)		—			(5.8		)	(0.1		)	(11.5		)
	Net carrying amount as of March 31, 2015		$	252.4		$	135.2			$	1.4		$	129.1		$	6.3		$	272
	Consolidated
	Net carrying amount as of March 31, 2013		$	1,118.40		$	332			$	—		$	267.7		$	13.8		$	613.5
	Acquisitions		24.9			3.9				2			19.2			—			25.1
	Purchase price allocation adjustments		1.1			—				—			—			—			—
	Amortization		—			—				(0.1		)	(47.7		)	(3.0		)	(50.8		)
	Currency translation adjustment and other		6.3			2.5				—			2.2			0.1			4.8
	Net carrying amount as of March 31, 2014		$	1,150.70		$	338.4			$	1.9		$	241.4		$	10.9		$	592.6
	Acquisitions		74.7			—				6.8			58.9			1.5			67.2
	Purchase price allocation adjustments		1.8			(3.1		)		1.3			—			—			(1.8		)
	Amortization		—			—				(1.2		)	(50.4		)	(3.5		)	(55.1		)
	Currency translation adjustment and other (1)		(24.9		)	(7.2		)		(0.1		)	(7.8		)	(0.1		)	(15.2		)
	Net carrying amount as of March 31, 2015		$	1,202.30		$	328.1			$	8.7		$	242.1		$	8.8		$	587.7
	(1) Includes $4.1 million of goodwill allocated to the Mill Products business in connection to the Company's decision to discontinue the Mill Products business during fiscal 2015. See Note 4 for additional information regarding the discontinued operation.
	The gross carrying amount and accumulated amortization for each major class of identifiable intangible assets as of March 31, 2015 and March 31, 2014 are as follows (in millions):
				March 31, 2015
		Weighted Average Useful Life		Gross Carrying Amount			Accumulated Amortization				Net Carrying Amount
	Intangible assets subject to amortization:
	Patents	10 years		$	40.1		$	(31.3	)		$	8.8
	Customer relationships (including distribution network)	13 years		635.4			(393.3		)		242.1
	Tradenames	8 years		10			(1.3		)		8.7
	Intangible assets not subject to amortization - trademarks and tradenames			328.1			—				328.1
				$	1,013.60		$	(425.9	)		$	587.7
				March 31, 2014
		Weighted Average Useful Life		Gross Carrying Amount			Accumulated Amortization				Net Carrying Amount
	Intangible assets subject to amortization:
	Patents	10 years		$	38.7		$	(27.8	)		$	10.9
	Customer relationships (including distribution network)	12 years		584.3			(342.9		)		241.4
	Tradenames	7 years		2			(0.1		)		1.9
	Intangible assets not subject to amortization - trademarks and tradenames			338.4			—				338.4
				$	963.4		$	(370.8	)		$	592.6
	Intangible asset amortization expense totaled $55.1 million, $50.8 million and $51.1 million for the years ended March 31, 2015, 2014 and 2013, respectively.
	The Company expects to recognize amortization expense on the intangible assets subject to amortization of $57.0 million in fiscal year 2016, $37.9 million in fiscal year 2017, $26.7 million in fiscal year 2018, $26.5 million in fiscal year 2019, and $26.3 million in fiscal year 2020.
	During the third quarter of fiscal 2015, the Company completed the testing of indefinite lived intangible assets (tradenames) and goodwill for impairment in accordance with ASC 350, Intangibles-Goodwill and Other. The fair value of the Company's indefinite lived intangible assets and reporting units were primarily estimated using an income valuation model (discounted cash flow) and market approach (guideline public company comparables), which indicated that the fair value of the Company's indefinite lived intangible assets and reporting units exceeded their carrying value; therefore, no impairment was present. Total cumulative goodwill impairment charges as of March 31, 2015 and 2014 were $323.4 million and $319.3 million, respectively.

Other_Current_Liabilities

Other Current Liabilities	12 Months Ended
	Mar. 31, 2015
Other Liabilities Disclosure [Abstract]
Other Current Liabilities	Other Current Liabilities
	Other current liabilities are summarized as follows (in millions):
		March 31,
		2015		2014
	Customer advances	$	7	$	8.1
	Sales rebates	25.4		22.7
	Commissions	3.9		7.9
	Restructuring and other similar charges (1)	7		3.8
	Product warranty (2)	6.8		8
	Risk management (3)	9.4		9.1
	Legal and environmental	3.8		4.5
	Deferred income taxes	12.9		10.9
	Taxes, other than income taxes	8		9.5
	Income taxes payable	17.9		11.2
	Interest payable	5.5		—
	Other	19.7		16.5
		$	127.3	$	112.2
	____________________
	-1	See more information related to the restructuring obligations balance within Note 5.
	-2	See more information related to the product warranty obligations balance within Note 2.
	-3	Includes projected liabilities related to losses arising from automobile, general and product liability claims.

LongTerm_Debt

Long-Term Debt	12 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt
	Long-term debt is summarized as follows (in millions):
			March 31,
			2015		2014
	Term loans (1)		1,905.40		1,921.90
	8.875% Senior notes due 2016		1.3		1.3
	Other (2)		43.8		48.8
	Total		1,950.50		1,972.00
	Less current maturities		24.3		29
	Long-term debt		$	1,926.20	$	1,943.00
	____________________
	-1	Includes an unamortized original issue discount of $15.4 million and $18.3 million at March 31, 2015 and March 31, 2014, respectively.
	-2	Includes financing related to the Company's participation in the New Market Tax Credit incentive program of $37.4 million as of March 31, 2015 and 2014.
	Senior Secured Credit Facility
	During the second quarter of fiscal 2014, the Company entered into the Third Amended and Restated First Lien Credit Agreement (the "Credit Agreement"). The senior secured credit facilities under the Credit Agreement are funded by a syndicate of banks and other financial institutions and provide for loans of up to $2,215.0 million, consisting of (i) a $1,950.0 million term loan facility with a maturity date of August 21, 2020 (the "Term Loan"); and (ii) a $265.0 million revolving credit facility with a maturity date of March 15, 2017; under the revolving credit facility, the Company has borrowing capacity available for letters of credit and for borrowings on a same-day notice, referred to as swingline loans.
	The proceeds of the Term Loan were used to (i) repay in full the $786.2 million aggregate principal amount of existing term loans then-outstanding under the Company's former credit agreement, together with accrued interest thereon, (ii) retire (through a cash tender offer and redemption) all of the Company's former 8.50% Senior Notes due 2018 (the “8.50% Notes”) and (iii) pay related fees and expenses. The Company accounted for these transactions in accordance with ASC 470-50, Debt Modifications and Extinguishments (“ASC 470-50”). The Company recognized a $129.2 million loss on the debt extinguishment which was comprised of a $109.9 million bond tender premium paid to holders of the 8.50% Notes as a result of the tender offer and redemption, third party transaction costs of $5.3 million and a $14.0 million non-cash write-off of deferred financing fees and net original issue discount associated with the extinguished debt.
	In the first quarter of fiscal 2014, the Company made a $150.0 million prepayment under the former credit agreement and recognized a related pre-tax loss of $4.0 million in accordance with ASC 470-50 which was comprised of $0.8 million of fees paid to lenders and a non-cash write-off of $3.2 million of deferred financing fees and net original issue discount associated with the extinguished debt.
	As of March 31, 2015, the Company's outstanding borrowings under the Term Loan were $1,905.4 million (net of $15.4 million unamortized original issue discount). At March 31, 2015, the borrowings under the Credit Agreement had an effective and average interest rate of 4.00%, determined as the London Interbank Offered Rate or LIBOR (subject to a 1% floor) plus an applicable margin of 3.00%. The interest rates for the Term Loan are subject to a leverage-based pricing grid. As of March 31, 2015, interest rates under the Credit Agreement for the Term Loan were at the Company's option of either "(a)" or "(b)" as further described here: (a) in the case of alternative base rate ("ABR") borrowings, 2.00% (subject to a first lien leverage ratio) plus a base rate determined by reference to the highest of (1) the federal funds effective rate plus 0.50%, (2) the prime rate determined from time to time by Credit Suisse AG, the administrative agent under the Credit Agreement and (3) LIBOR in effect for a one-month period plus 1.00%; or (b) in the case of Eurocurrency borrowings, 3.00% (subject to a first lien leverage ratio) plus a Eurocurrency rate (subject to a 1% LIBOR floor). In the event the Company's first lien leverage ratio is less than 3.25 to 1.0, its applicable margin on both ABR and Eurocurrency term loan borrowings would decrease by twenty-five (25) basis points.
	For revolving commitments, the Company's applicable margin above the base rate (as described above) is 3.00% in the case of ABR borrowings and 4.00% in the case of Eurocurrency borrowings, subject to a first lien leverage test. In the event the Company's first lien leverage ratio is less than 1.5 to 1.0, its applicable margin on both ABR and Eurocurrency borrowings would decrease by twenty-five (25) basis points. The Company's actual first lien leverage ratio was 3.85 to 1.0 as of March 31, 2015.
	In addition to paying interest on outstanding principal under the senior secured credit facilities, the Company is subject to a commitment fee to the lenders under the revolving credit facility with respect to the unutilized commitments thereunder at a rate equal to 0.500% per annum.
	As of March 31, 2015, the remaining mandatory principal payments prior to maturity on the term loan facilities were $102.4 million. Principal payments of $4.9 million are scheduled to be made at the end of each calendar quarter until June 30, 2020.
	All amounts outstanding under the revolving credit facility will be due and payable in full, and the commitments thereunder will terminate, on March 15, 2017. No amounts were borrowed under the revolving credit facility at March 31, 2015 or March 31, 2014; however, $24.0 million and $29.1 million of the revolving credit facility was considered utilized in connection with outstanding letters of credit at March 31, 2015 and March 31, 2014, respectively.
	The Credit Agreement, among other things: (i) allows for one or more future issuances of secured notes, which may include, in each case, indebtedness secured on a pari passu basis with the obligations under the senior secured credit facilities, so long as, in each case, among other things, an agreed amount of the net cash proceeds from any such issuance are used to prepay term loans under the senior secured credit facilities at par; (ii) subject to the requirement to make such offers on a pro rata basis to all lenders and certain other restrictions, allows the Company to agree with individual lenders to extend the maturity date of any of the loans and/or commitments provided by such lenders and to otherwise modify the terms of the loans and/or commitments provided by such lenders (including, without limitation, increasing the interest rate or fees payable in respect of such loans and/or commitments and/or modifying the amortization schedule in respect of such loans); and (iii) allows for one or more future issuances of additional secured notes, which may include, in each case, indebtedness secured on a pari passu basis with the obligations under the senior secured credit facilities, in an amount not to exceed the amount of incremental facility availability under the senior secured credit facilities.
	The Credit Agreement also contains a number of typical covenants that, among other things, constrain, subject to certain fully-negotiated exceptions, the Company's ability, and the ability of the Company's subsidiaries, to: sell assets; incur additional indebtedness; repay other indebtedness; pay dividends and distributions, repurchase its capital stock, or make payments, redemptions or repurchases in respect to certain indebtedness; create liens on assets; make investments, loans, guarantees or advances; make certain acquisitions; engage in certain mergers or consolidations; enter into sale-and-leaseback transactions; engage in certain transactions with affiliates; amend certain material agreements governing its indebtedness; make capital expenditures; enter into hedging agreements; amend its organizational documents; change the business conducted by it and its subsidiaries; and enter into agreements that restrict dividends from subsidiaries. In addition, payment of borrowings under the Credit Agreement may be accelerated upon an event of default. Events of default include, among others, the failure to pay principal and interest when due, a material breach of a representation or warranty, covenant defaults, certain non-payments or defaults under other material indebtedness, events of bankruptcy and a change of control. As of March 31, 2015, the Company was in compliance with all applicable covenants under its Credit Agreement, including compliance with a maximum permitted first lien leverage ratio (the Company's sole financial maintenance covenant under its revolver) of 7.75 to 1.00.
	Senior Notes and Former Senior Subordinated Notes
	Outstanding Tranche of Notes
	At March 31, 2015 and 2014, the Company had outstanding $1.3 million in principal of the 8.875% Notes. The indenture governing the 8.875% Notes does not contain any material restrictive covenants and permits optional redemption of the notes by the Company on terms specified therein.
	Former Tranches of Notes
	During fiscal 2013, the Company completed a full redemption of all $300.0 million principal amount of its then-outstanding 11.75% senior subordinated notes due 2016 (the "11.75% Notes") for $325.0 million in cash, which included $7.4 million of accrued interest and $17.6 million of early redemption premiums. The Company recognized related pre-tax expense of $21.1 million, which was comprised of a $17.6 million early redemption premiums and a $3.5 million non-cash write-off of unamortized deferred financing costs associated with the 11.75% Notes. Upon the redemption, the indenture governing the 11.75% Notes was discharged in accordance with its terms.
	Other Subsidiary Debt
	During fiscal 2013 and fiscal 2012, the Company received $4.3 million and $5.5 million, respectively, in net proceeds from financing agreements related to facility modernization projects at two North American manufacturing facilities. These financing agreements were structured with unrelated third party financial institutions (the "Investor") and their wholly-owned community development entities in connection with the Company's participation in transactions qualified under the federal New Market Tax Credit program, pursuant to Section 45D of the Internal Revenue Code of 1986, as amended. Through its participation in this program, the Company has secured low interest financing and the potential for future debt forgiveness related to eligible capital projects. Upon closing of these transactions, the Company provided an aggregate of $27.6 million to the Investor, in the form of loans receivable, with a term of thirty years, bearing an interest rate of approximately 2.0% per annum. As collateral for these loans, the Company has granted a security interest in the assets acquired with the loan proceeds. No earlier than December 2018, and upon meeting certain conditions, both the Investor and the Company have the ability to trigger forgiveness of the net debt which could result in a net non-operating gain of up to $9.8 million, excluding applicable transaction costs. To the extent the loans payable are not forgiven, the Company would be required to repay the full amount of the outstanding $37.4 million principal balance and would concurrently receive a loan repayment of $27.6 million on the aforementioned loans receivable, resulting in a net $9.8 million use of liquidity.
	At March 31, 2015 and March 31, 2014, the aggregate loans of $37.4 million are recorded in Long-Term Debt on the consolidated balance sheets and the aggregate loans receivable of $27.6 million are recorded in Other Assets on the consolidated balance sheets. The Company incurred $0.7 million of debt issuance costs related to the above transactions, which are being amortized over the life of the agreements.
	At March 31, 2015 and March 31, 2014, various wholly-owned subsidiaries had additional debt of $43.8 million and $48.8 million, respectively, comprised primarily of loans payable as a result of the New Market Tax Credit financing agreements referenced above as well as borrowings at various foreign subsidiaries and capital lease obligations.
	Accounts Receivable Securitization Program
	In fiscal 2012, the Company entered into a five-year Amended and Restated Receivables Funding and Administration Agreement (the “RFAA”) by and among Rexnord Funding LLC (“Funding,” a wholly-owned bankruptcy-remote special purpose subsidiary), the financial institutions from time to time party thereto, and General Electric Capital Corporation, as a lender, a swing line lender and administrative agent (“GECC”). The RFAA is the principal operative agreement under which certain subsidiaries continuously sell substantially all of their domestic trade accounts receivable to Funding for cash and subordinated notes (the “Program”). Funding in turn may obtain revolving loans and letters of credit from GECC under the RFAA. The maximum borrowing amount under the RFAA is $100.0 million, subject to certain eligibility requirements related to the amount and type of receivables owned by Funding; the RFAA also contains an “accordion” provision pursuant to which Funding can request that the facility be increased by $75.0 million. All of the receivables purchased by Funding are pledged as collateral for revolving loans and letters of credit obtained from GECC under the RFAA.
	The Program does not qualify for sale accounting under ASC 860, Transfers and Servicing (“ASC 860”), and as such, any borrowings are accounted for as secured borrowings on the consolidated balance sheet. Financing costs associated with the Program are recorded within “Interest expense, net” in the consolidated statement of operations if revolving loans or letters of credit are obtained under the RFAA.
	Borrowings under the RFAA bear interest at a rate equal to LIBOR plus 2.25%. Outstanding borrowings mature on May 20, 2016. In addition, a non-use fee of 0.50% is applied to the unutilized portion of the $100.0 million commitment. These rates are per annum and the fees are paid to GECC on a monthly basis.
	At March 31, 2015, the Company's available borrowing capacity under the Program was $100.0 million, based on the current accounts receivables balance subject to the Program. There were no borrowings outstanding under the Program as of March 31, 2015 and 2014. Additionally, the Program requires compliance with certain covenants and performance ratios contained in the RFAA. As of March 31, 2015, Funding was in compliance with all applicable covenants and performance ratios.
	Future Debt Maturities
	Future maturities of debt as of March 31, 2015, excluding the unamortized original issue discount of $15.4 million from the Term Loan, were as follows (in millions):
	Years ending March 31:
	2016	$	24.3
	2017	21.5
	2018	19.7
	2019	19.7
	2020	19.5
	Thereafter	1,861.20
		$	1,965.90
	Cash interest paid for the fiscal years ended March 31, 2015, 2014 and 2013 was $84.1 million, $151.1 million, and $149.4 million, respectively.

Derivative_Financial_Instrumen

Derivative Financial Instruments

12 Months Ended

Mar. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

Derivative Financial Instruments

The Company is exposed to certain financial risks relating to fluctuations in foreign currency exchange rates and interest rates. The Company currently selectively uses foreign currency forward exchange contracts and interest rate swap and cap contracts to manage its foreign currency and interest rate risks. All hedging transactions are authorized and executed pursuant to defined policies and procedures that prohibit the use of financial instruments for speculative purposes.

Foreign Exchange Contracts

The Company periodically enters into foreign currency forward contracts to mitigate the foreign currency volatility relative to certain intercompany and external cash flows expected to occur. These foreign currency forward contracts were not accounted for as effective cash flow hedges in accordance with ASC 815 and as such were marked to market through earnings. See the amounts recorded on the consolidated balance sheets and recognized within the consolidated statements of operations related to the Company's foreign currency forward contracts within the tables below.

Interest Rate Derivatives

During fiscal 2014, the Company entered into three forward-starting interest rate swaps to hedge the variability in future cash flows associated with a portion of the Company’s variable rate term loans. The forward-starting interest rate swaps convert $650.0 million of the Company’s variable-rate term loans to a weighted average fixed interest rate of 2.55% plus the applicable margin (inclusive of a 1% LIBOR floor). Those interest rate swaps become effective beginning on September 28, 2015 with a maturity of September 27, 2018. These interest rate derivatives have been designated as effective cash flow hedges in accordance with ASC 815.

During fiscal 2015, the Company entered into two interest rate caps in order to mitigate the Company's exposure to increasing interest rates on its variable-rate interest loans. Those interest rate caps were effective as of October 24, 2014, with a maturity of October 24, 2018; they cap the interest on $750.0 million of the Company's variable-rate interest loans at 3%, plus the applicable margin. In executing the interest rate caps, the Company paid a premium of $5.8 million. The interest rate caps have been designated as effective cash flow hedges in accordance with ASC 815. When combined with the Company's existing interest rate swaps, the Company has effectively hedged approximately 73% of its outstanding variable rate term loans with a weighted average interest rate that cannot exceed 2.79% plus the applicable margin of 3%.

The fair values of the Company's interest rate derivatives are recorded on the consolidated balance sheets with the corresponding offset recorded as a component of accumulated other comprehensive loss, net of tax. See the amounts recorded on the consolidated balance sheets related to the Company's interest rate derivatives within the tables below.

The Company's derivatives are measured at fair value in accordance with ASC 820. See Note 13 Fair Value Measurements for more information as it relates to the fair value measurement of the Company's derivative financial instruments.

The following tables indicate the location and the fair value of the Company's derivative instruments within the consolidated balance sheets segregated between designated, qualifying ASC 815 hedging instruments and non-qualifying, non-designated hedging instruments (in millions).

Fair value of derivatives designated as hedging instruments under ASC 815 (in millions):

31-Mar-15

31-Mar-14

Balance Sheet Classification

Liability Derivatives

Interest rate swaps

$

17.7

$

2.7

Other liabilities

Asset Derivatives

Interest rate caps

$

3

$

—

Other assets

Fair value of derivatives not designated as hedging instruments under ASC 815 (in millions):

March 31, 2015

March 31, 2014

Balance Sheet Classification

Asset Derivatives

Foreign currency forward contracts

$

0.4

$

0.1

Other current assets

The following tables indicate the location and the amount of losses and gains associated with the Company's derivative instruments, net of tax, within the consolidated balance sheets (for qualifying ASC 815 instruments) and recognized within the consolidated statements of operations. The information is segregated between designated, qualifying ASC 815 hedging instruments and non-qualifying, non-designated hedging instruments (in millions). As of March 31, 2015, there was no ineffectiveness on the Company's designated hedging instruments.

Amount of loss recognized in accumulated other comprehensive loss on derivatives

Derivative instruments designated as cash flow hedging relationships under ASC 815

March 31, 2015

March 31, 2014

Interest rate swaps

$

9.2

$

1.7

Interest rate caps

$

1.7

$

—

Amount recognized in other expense, net

Derivative instruments not designated as hedging instruments under ASC 815

Location of gain recognized in income on derivatives

Year Ended

March 31, 2015

March 31, 2014

March 31, 2013

Foreign currency forward contracts

Other income (expense), net

$

0.5

$

0.4

$

0.5

The Company expects to reclassify $5.2 million of accumulated other comprehensive loss into earnings as interest expense during the next twelve months related to interest rate derivatives. The Company did not reclassify any amounts from other comprehensive loss into earnings as interest expense during the fiscal years ending 2015, 2014, and 2013.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements
	ASC 820 defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants. ASC 820 also specifies a fair value hierarchy based upon the observability of inputs used in valuation techniques. Observable inputs (highest level) reflect market data obtained from independent sources, while unobservable inputs (lowest level) reflect internally developed assumptions about the assumptions a market participant would use.
	In accordance with ASC 820, 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; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs or significant value-drivers are observable.
	•	Level 3- Model-derived valuations in which one or more inputs or value-drivers are both significant to the fair value measurement and unobservable.
	If applicable, the Company uses quoted market prices in active markets to determine fair value, and therefore classifies such measurements within Level 1. In some cases where market prices are not available, the Company makes use of observable market based inputs to calculate fair value, in which case the measurements are classified within Level 2. If quoted or observable market prices are not available, fair value is based upon internally developed models that use, where possible, current market-based parameters. These measurements are classified within Level 3 if they use significant unobservable inputs.
	Fair Value of Derivative Instruments
	The Company transacts in foreign currency forward contracts and interest rate swaps and caps, which are impacted by ASC 820. The fair value of foreign currency forward contracts is based on a pricing model that utilizes the differential between the contract price and the market-based forward rate as applied to fixed future deliveries of currency at pre-designated settlement dates. The fair value of interest rate swaps and caps is based on pricing models. These models use discounted cash flows that utilize the appropriate market-based forward swap curves and interest rates.
	The Company endeavors to utilize the best available information in measuring fair value. As required by ASC 820, financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The Company has determined that its foreign currency forward contracts and interest rate swaps reside within Level 2 of the fair value hierarchy. There were no transfers of assets between levels during the years ended March 31, 2015 and March 31, 2014. The following table provides a summary of the Company's assets and liabilities that were recognized at fair value on a recurring basis as of March 31, 2015 and March 31, 2014 (in millions):
			Fair Value as of March 31, 2015
			Level 1		Level 2		Level 3		Total
	Assets:
	Interest rate caps		$	—	$	3	$	—	$	3
	Foreign currency forward contracts		—		0.4		—		0.4
	Total assets at fair value		$	—	$	3.4	$	—	$	3.4
	Liabilities:
	Interest rate swaps		$	—	$	17.7	$	—	$	17.7
	Total liabilities at fair value		$	—	$	17.7	$	—	$	17.7
			Fair Value as of March 31, 2014
			Level 1		Level 2		Level 3		Total
	Assets:
	Foreign currency forward contracts		$	—	$	0.1	$	—	$	0.1
	Total assets at fair value		$	—	$	0.1	$	—	$	0.1
	Liabilities:
	Interest rate swaps		$	—	$	2.7	$	—	$	2.7
	Total liabilities at fair value		$	—	$	2.7	$	—	$	2.7
	Fair Value of Non-Derivative Financial Instruments
	The carrying amounts of cash, receivables, payables and accrued liabilities approximated fair value at March 31, 2015 and March 31, 2014 due to the short-term nature of those instruments. The fair value of long-term debt recorded on the consolidated balance sheets as of March 31, 2015 and March 31, 2014 was approximately $1,970.6 million and $1,995.1 million, respectively. The fair value is based on quoted market prices for the same issues.
	Long-lived Assets and Intangible Assets
	Long-lived assets (which include property, plant and equipment and real estate) may be measured at fair value if such assets are held-for-sale or when there is a determination that the asset is impaired. Intangible assets (which include patents, tradenames, customer relationships, and non-compete agreements) also may be measured at fair value when there is a determination that the asset is impaired. The determination of fair value for these assets is based on the best information available that resides within Level 3 of the fair value hierarchy, including internal cash flow estimates discounted at an appropriate interest rate, quoted market prices when available, market prices for similar assets and independent appraisals, as appropriate. For real estate, cash flow estimates are based on current market estimates that reflect current and projected lease profiles and available industry information about expected trends in rental, occupancy and capitalization rates.
	During fiscal 2015, the Company ceased operations of its Mill Products business and recorded a net impairment loss of $3.8 million to place the long-lived assets of that business at net realizable value. The impairment loss recognized was determined utilizing independent appraisals of the assets, classified as Level 3 inputs within the fair value hierarchy. At March 31, 2015, the Company remaining long-lived assets of the Mill Products business with a net realizable value of approximately $2.6 million are classified within assets held for sale on the consolidated balance sheets. See Note 4 Discontinued Operations for additional information.

Leases

Leases	12 Months Ended
	Mar. 31, 2015
Leases [Abstract]
Leases	Leases
	The Company leases manufacturing and warehouse facilities and data processing and other equipment under non-cancelable operating leases which expire at various dates primarily through 2024. Rent expense under operating leases totaled $19.4 million, $17.0 million and $16.0 million for the fiscal years ended March 31, 2015, 2014 and 2013, respectively.
	Future minimum rental payments for operating leases with initial terms in excess of one year as of March 31, 2015 are as follows (in millions):
	Years ending March 31:
	2016	$	14.8
	2017	11.5
	2018	9.5
	2019	7.8
	2020	6.9
	Thereafter	4.4
		$	54.9

StockBased_Compensation

Stock-Based Compensation	12 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation
	In accordance with ASC 718, the Company recognizes compensation costs related to share-based payment transactions. Generally, compensation cost is measured based on the grant-date fair value of the equity instruments issued. Compensation cost is recognized over the requisite service period, generally as the awards vest.
	In fiscal 2007, the Board of Directors adopted, and stockholders approved, the 2006 Stock Option Plan (the “2006 Option Plan”). The maximum number of shares of the Company's common stock that may be issued or transferred pursuant to options under the 2006 Option Plan equals 11,239,290 shares. Following the consummation of the Company's initial public offering ("IPO") in April 2012, all outstanding unvested options under the 2006 Option Plan, including that portion of options that was scheduled to vest with respect to fiscal 2012 Company performance, were amended to vest solely based on continued employment with the Company over the 5 year vesting period. No further options are being granted under the 2006 Option Plan.
	In fiscal 2012, the Board of Directors adopted, and stockholders approved, the Rexnord Corporation 2012 Performance Incentive Plan (the "2012 Incentive Plan", and together with the 2006 Option Plan, the "Incentive Plans"), which operates as a successor plan to the 2006 Option Plan. The 2012 Incentive Plan is intended to provide performance incentives to the Company's officers, employees, directors and certain others by permitting grants of equity awards and performance-based cash awards to such persons, to encourage them to maximize Rexnord's performance and create value for Rexnord's stockholders, but broadens the types of awards that had been permitted by the 2006 Option Plan. To date, both stock options and Restricted Stock Units ("RSUs) have been issued under the Incentive Plans.
	The options granted under the 2012 Incentive Plan have a maximum term of ten years after the grant date. Options granted from the inception of the plan through July 31, 2014 vest 50% over three years after the grant date and the remaining 50% vest five years after the grant date. Options and RSUs granted after July 31, 2014 vest ratably over four years. Options granted to directors of the Company vest ratably over three years.
	The 2012 Incentive Plan permits the grant of awards that may deliver up to an aggregate of 8,350,000 shares of common stock further subject to limits on the number of shares that may be delivered pursuant to incentive stock options and on the shares that may be delivered on the awards to any individual in a single year, within the meaning of Section 162(m) of the Internal Revenue Code. The 2012 Incentive Plan is administered by the Compensation Committee.
	During fiscal 2015, 2014 and 2013, the Company recorded $6.4 million, $7.0 million and $7.1 million of stock-based compensation, respectively (the related tax benefit on these amounts was $2.2 million for fiscal 2015, $2.5 million for fiscal 2014, and $2.5 million for fiscal 2013). During fiscal 2015, 2014 and 2013, the Company also recorded $5.8 million, $5.8 million and $18.1 million, respectively, of an excess tax benefit related to stock options exercised during each fiscal year. As of March 31, 2015, there was $17.3 million of total unrecognized compensation cost related to non-vested stock options and RSUs granted under the Incentive Plans. That cost is expected to be recognized over a weighted-average period of 3.2 years.
	In February 2015, the Company's Board of Directors approved a stock repurchase program (the "Repurchase Program") authorizing the repurchase of up to $200 million of the Company's common stock from time to time on the open market or in privately negotiated transactions. The Repurchase Program does not require the Company to acquire any particular amount of common stock and does not specify the timing of purchases or the prices to be paid. As of March 31, 2015, the Company had not repurchased any shares of common stock through the Repurchase Program.
	Stock Options
	The fair value of each option granted under the Incentive Plans was estimated on the date of grant using the Black-Scholes valuation model that uses the following weighted-average assumptions:
		Year Ended March 31, 2015		Year Ended March 31, 2014		Year Ended March 31, 2013
	Expected option term (in years)	7.1		7.5		7.5
	Expected volatility factor	26	%	35	%	34	%
	Weighted-average risk free interest rate	2.1	%	1.57	%	1.71	%
	Expected dividend rate	0	%	0	%	0	%
	Options granted under the Incentive Plans have a term of ten years. Management’s estimate of the option term for options granted under the Incentive Plans is 7.1 years based on the midpoint between when the options vest and when they expire. The Company uses the simplified method to determine the expected term, as management does not have sufficient historical exercise data to provide a reasonable basis upon which to estimate the expected term due to the limited period of time its common stock shares has been publicly traded. The Company’s expected volatility assumptions are based on the expected volatilities of publicly-traded companies within the Company’s industry. The weighted average risk free interest rate is based on the U.S. Treasury yield curve in effect at the date of grant. Management also assumes expected dividends of zero. The weighted-average grant date fair value of options granted under the Incentive Plans during fiscal 2015, 2014 and 2013 was $9.21, $8.06 and $8.22, respectively. The total fair value of options vested during fiscal 2015, 2014 and 2013 was $1.3 million, $1.8 million and $2.2 million, respectively.
	Other information relative to stock options and the changes period over period are as follows:
		Year-Ended March 31, 2015					Year-Ended March 31, 2014				Year-Ended March 31, 2013
		Shares		Weighted Avg. Exercise Price			Shares		Weighted Avg. Exercise Price		Shares		Weighted Avg. Exercise Price
	Number of shares under options:
	Outstanding at beginning of period	8,652,834		$	10.79		9,450,197		$	9.85	10,874,371		$	5.27
	Granted	1,268,124		28.3			978,849		19.82		2,626,157		20.56
	Exercised (1)	(743,807	)	5.85			(1,154,011	)	5.91		(3,746,740	)	3.77
	Canceled/Forfeited	(588,633	)	21.65			(622,201	)	19.91		(303,591	)	13.58
	Outstanding at end of period (2)	8,588,518		$	13.06		8,652,834		$	10.79	9,450,197		$	9.85
	Exercisable at end of period (3)	4,798,457		$	5.67		5,225,236		$	5.46	5,879,052		$	5.3
	______________________
	-1	The total intrinsic value of options exercised during fiscal 2015, 2014 and 2013 was $16.7 million, $18.7 million and $56.1 million, respectively.
	-2	The weighted average remaining contractual life of options outstanding was 5.0 years at March 31, 2015, 5.5 years at March 31, 2014 and 6.1 years at March 31, 2013. The aggregate intrinsic value of options outstanding at March 31, 2015 was $119.1 million.
	-3	The weighted average remaining contractual life of options exercisable was 2.6 years at March 31, 2015, 3.7 years at March 31, 2014 and 4.6 years at March 31, 2013. The aggregate intrinsic value of options exercisable at March 31, 2015 was $100.9 million.
		Shares		Weighted
				Average  Grant
				Date Fair Value
	Non-vested options at March 31, 2014	3,427,598		$	7.62
	Granted	1,268,124		9.21
	Vested	(318,774	)	3.99
	Canceled/Forfeited	(588,633	)	8.43
	Non-vested options at March 31, 2015	3,788,315		$	8.33
	Restricted Stock Units
	During fiscal 2015, the Company granted 58,883 RSUs to certain of its officers and employees. RSUs granted under the 2012 Incentive Plan vest ratably over four years. The fair value of each award is determined based on the Company's closing stock price on the date of grant. The weighted-average grant date fair value of the RSUs granted and outstanding under the 2012 Incentive Plan for fiscal 2015 was $29.08 per unit.

Retirement_Benefits

Retirement Benefits	12 Months Ended
	Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Retirement Benefits	Retirement Benefits
	The Company sponsors pension and other postretirement benefit plans for certain employees. Most of the Company’s employees are accumulating retirement income benefits through defined contribution plans. However, the Company does sponsor frozen pension plans for its salaried participants and ongoing pension benefits for certain employees represented by collective bargaining. These plans provide for monthly pension payments to eligible employees upon retirement. Pension benefits for salaried employees generally are based on years of frozen credited service and average earnings. Pension benefits for hourly employees generally are based on specified benefit amounts and years of service. The Company’s policy is to fund its pension obligations in conformity with the funding requirements under applicable laws and governmental regulations. Other postretirement benefits consist of retiree medical plans that cover a portion of employees in the United States that meet certain age and service requirements.
	The corridor is 10% of the higher of the pension benefit obligation or the fair value of the plan assets. The Company recognizes the net actuarial gains or losses in excess of 10% of the higher of the pension benefit obligation or the fair value of the plan assets in operating results during the fourth quarter of each fiscal year (or upon any required re-measurement event). During the fiscal years ending March 31, 2015, 2014 and 2013, the Company recognized non-cash actuarial losses of $59.4 million, $2.7 million and $5.5 million, respectively, in connection with this accounting policy. Net periodic benefit costs recorded on a quarterly basis are primarily comprised of service and interest cost, amortization of unrecognized prior service cost and the expected return on plan assets.
	In October 2014, the Society of Actuaries issued revised mortality tables (RP 2014) and a mortality improvement scale (MP 2014) for use by actuaries, insurance companies, governments, benefit plan sponsors and others in setting assumptions regarding life expectancy in the United States for purposes of estimating pension and OPEB obligations, costs and required contribution amounts. The new mortality tables indicate substantial life expectancy improvements since the last study published in 2000 (RP 2000). In conjunction with the re-measurement of the pension and other post-retirement obligations in fiscal 2015, the adoption of the newly issued mortality tables and mortality improvement scale and lower discount rates resulted in the recognition of non-cash actuarial losses of $52.9 million.
	In addition, during fiscal 2015 the Company offered approximately 4,500 inactive participants in its domestic non-union defined benefit plans with vested benefits the opportunity to receive a lump sum settlement of the value of the participant’s pension benefit. Acceptance of the offer by a participant was completely voluntary, and if accepted, participants could elect to receive the settlement in the form of a single lump sum payment or in the form of a monthly annuity beginning during fiscal 2015. The election period for this voluntary offer closed on October 15, 2014 and a total of $65.0 million was paid to electing participants during fiscal 2015. The settlement and corresponding re-measurement of the domestic non-union defined benefit plan resulted in the recognition of non-cash actuarial losses during fiscal 2015 of $6.5 million.
	The components of net periodic benefit cost reported in the consolidated statements of operations are as follows (in millions):
		Year Ended
		March 31, 2015				March 31, 2014				March 31, 2013
	Pension Benefits:
	Service cost	$	1.4			$	1.8			$	1.9
	Interest cost	30				30.1				31.6
	Expected return on plan assets	(29.8		)		(30.5		)		(31.9		)
	Amortization of:
	Prior service cost	0.2				0.2				0.6
	Curtailment loss	—				—				0.2
	Settlement loss	6.5				—				—
	Recognition of actuarial losses	51.7				2.7				7.2
	Net periodic benefit cost	$	60			$	4.3			$	9.6
	Other Postretirement Benefits:
	Service cost	$	0.1			$	0.1			$	0.1
	Interest cost	1.3				1.2				1.5
	Amortization:
	Prior service credit	(1.9		)		(1.9		)		(2.0		)
	Recognition of actuarial losses (gains)	1.2				—				(1.7		)
	Net periodic benefit cost	$	0.7			$	(0.6	)		$	(2.1	)
	The Company made contributions to its U.S. qualified pension plan trusts of $7.9 million, $7.8 million, and $8.4 million during the years ended March 31, 2015, 2014 and 2013, respectively.
	The status of the plans are summarized as follows (in millions):
		Pension Benefits								Other Postretirement Benefits
		Year Ended March 31, 2015				Year Ended March 31, 2014				Year Ended March 31, 2015			Year Ended March 31, 2014
	Benefit obligation at beginning of period	$	(700.0	)		$	(720.6	)		$	(31.2	)	$	(33.6	)
	Service cost	(1.4		)		(1.8		)		(0.1		)	(0.1		)
	Interest cost	(30.0		)		(30.1		)		(1.3		)	(1.2		)
	Actuarial (losses) gains	(114.2		)		18.2				(2.1		)	0.4
	Plan amendments	—				0.2				—			—
	Benefits paid	40.8				38.5				3.2			4.1
	Plan participant contributions	(0.4		)		(0.4		)		(0.9		)	(0.8		)
	Settlements	65				—				—			—
	Translation adjustment	21.4				(4.0		)		—			—
	Benefit obligation at end of period	$	(718.8	)		$	(700.0	)		$	(32.4	)	$	(31.2	)
	Plan assets at the beginning of the period	$	577.7			$	577.7			$	—		$	—
	Actual return on plan assets	65				25.6				—			—
	Contributions	12.5				12.8				3.2			4.1
	Benefits paid	(40.8		)		(38.5		)		(3.2		)	(4.1		)
	Settlements	(65.0		)		—				—			—
	Translation adjustment	(6.2		)		0.1				—			—
	Plan assets at end of period	$	543.2			$	577.7			$	—		$	—
	Funded status of plans	$	(175.6	)		$	(122.3	)		$	(32.4	)	$	(31.2	)
	Net amount on Consolidated Balance Sheets consists of:
	Current liabilities	$	(2.3	)		$	(3.0	)		$	(2.7	)	$	(2.8	)
	Long-term liabilities	(173.3		)		(119.3		)		(29.7		)	(28.4		)
	Total net funded status	$	(175.6	)		$	(122.3	)		$	(32.4	)	$	(31.2	)
	As of March 31, 2015, the Company had pension plans with a combined projected benefit obligation of $718.8 million compared to plan assets of $543.2 million, resulting in an under-funded status of $175.6 million compared to an under-funded status of $122.3 million at March 31, 2014. The Company’s funded status has declined year-over-year primarily as a result of the adoption of the new mortality tables and lower discount rates in fiscal 2015. Any further changes in the assumptions underlying the Company’s pension values, including those that arise as a result of declines in equity markets and changes in interest rates, could result in increased pension obligation and pension cost which could negatively affect the Company’s consolidated financial position and results of operations in future periods.
	Amounts included in accumulated other comprehensive loss (income), net of tax, related to defined benefit plans at March 31, 2015 and 2014 consist of the following (in millions):
		As of March 31, 2015
		Pension				Postretirement				Total
		Benefits				Benefits
	Unrecognized prior service cost (credit)	$	0.2			$	(7.1	)		$	(6.9	)
	Unrecognized actuarial loss	71.7				1.2				72.9
	Accumulated other comprehensive loss (income), gross	71.9				(5.9		)		66
	Deferred income tax (benefit) provision	(27.4		)		2.5				(24.9		)
	Accumulated other comprehensive loss (income), net	$	44.5			$	(3.4	)		$	41.1
		As of March 31, 2014
		Pension				Postretirement				Total
		Benefits				Benefits
Unrecognized prior service cost (credit)	$	0.5			$	(9.1	)		$	(8.6	)
Unrecognized actuarial loss	54.9				0.4				55.3
Accumulated other comprehensive loss (income), gross	55.4				(8.7		)		46.7
Deferred income tax (benefit) provision	(19.7		)		2.9				(16.8		)
Accumulated other comprehensive loss (income), net	$	35.7			$	(5.8	)		$	29.9
The Company expects to recognize $0.1 million and $(2.0) million of prior service costs (credits) included in accumulated other comprehensive (loss) income for pension benefits and other postretirement benefits, respectively, as components of net periodic benefit cost during the next fiscal year.
The following table presents significant assumptions used to determine benefit obligations and net periodic benefit cost (income) in weighted-average percentages:
	Pension Benefits									Other Postretirement Benefits
	March 31, 2015			March 31, 2014			March 31, 2013			March 31, 2015		March 31, 2014			March 31, 2013
Benefit Obligations:
Discount rate	3.7	%		4.54	%		4.25	%		3.8	%	4.3	%		3.8	%
Rate of compensation increase	3.4	%		3.41	%		3.42	%		n/a		n/a			n/a
Net Periodic Benefit Cost:
Discount rate	4.54	%		4.25	%		4.83	%		4.3	%	3.8	%		4.4	%
Rate of compensation increase	3.41	%		3.42	%		3.4	%		n/a		n/a			n/a
Expected return on plan assets	5.3	%		5.48	%		6	%		n/a		n/a			n/a
In evaluating the expected return on plan assets, consideration was given to historical long-term rates of return on plan assets and input from the Company’s pension fund consultant on asset class return expectations, long-term inflation and current market conditions.
The following table presents the Company’s target investment allocations for the year ended March 31, 2015 and actual investment allocations at March 31, 2015 and 2014.
	Plan Assets
	2015								2014
	Investment		Target			Actual			Actual
	Policy (1)		Allocation (2)			Allocation			Allocation
Equity securities	20 - 30%		29	%		28	%		30	%
Debt securities (including cash and cash equivalents)	55 - 80%		67	%		67	%		67	%
Other	0 - 10%		4	%		5	%		3	%
-1	The investment policy allocation represents the guidelines of the Company's principal U.S. pension plans based on the changes in the plans funded status.
-2	The target allocations represent the weighted average target allocations for the Company's principal U.S. pension plans.
The Company's defined benefit pension utilizes a dynamic liability driven investment (“LDI”) strategy. The objective is to more closely align the pension plan assets with its liabilities in terms of how both respond to interest rate changes. The plan assets are allocated into two investment categories: (i) LDI, comprised of high quality, investment grade fixed income securities and (ii) return seeking, comprised of traditional securities and alternative asset classes. All assets are managed externally according to guidelines established individually with investment managers and the Company's investment consultant. The Company periodically undertakes asset and liability modeling studies to determine the appropriateness of the investments. The Company intends to continuously reduce the assets allocated to the return seeking category, thereby increasing the assets allocated to the LDI category based on the overall improvement in the plan funded status. No equity securities of the Company are held in the portfolio.
The fair values of the Company’s pension plan assets for both the U.S and non-U.S. plans at March 31, 2015 and 2014, by asset category are included in the table below (in millions). For additional information on the fair value hierarchy and the inputs used to measure fair value, see Note 13 Fair Value Measurements.
	As of March 31, 2015
	Quoted Prices in				Significant Other				Significant			Total
	Active  Market				Observable  Inputs				Unobservable
	(Level 1)				(Level 2)				Inputs (Level 3)
Cash and cash equivalents	$	1.8			$	5.6			$	—		$	7.4
Investment funds
Fixed income funds (1)	—				355.5				—			355.5
U.S. equity funds (2)	—				68.1				—			68.1
International equity funds (2)	—				35.8				—			35.8
Balanced funds (2)	—				10.1				—			10.1
Alternative investment funds (3)	—				—				42.9			42.9
Insurance contracts	—				—				23.4			23.4
Total	$	1.8			$	475.1			$	66.3		$	543.2
	As of March 31, 2014
	Quoted Prices in				Significant Other				Significant			Total
	Active  Market				Observable  Inputs				Unobservable
	(Level 1)				(Level 2)				Inputs (Level 3)
Cash and cash equivalents	$	5.8			$	3			$	—		$	8.8
Investment funds
Fixed income funds (1)	—				374.4				—			374.4
U.S. equity funds (2)	—				74.4				—			74.4
International equity funds (2)	—				39.8				—			39.8
Balanced funds (2)	—				10.2				—			10.2
Alternative investment funds (3)	—				—				53.6			53.6
Insurance contracts	—				—				16.5			16.5
Total	$	5.8			$	501.8			$	70.1		$	577.7
-1	The Company's fixed income mutual and commingled funds primarily include investments in U.S. government securities and corporate bonds. The commingled funds also include an insignificant portion of investments in asset-backed securities or partnerships. The mutual and commingled funds are valued using quoted market prices of the underlying investments.
-2	The Company's equity mutual and commingled funds primarily include investments in U.S. and international common stock. The balanced mutual and commingled funds invest in a combination of fixed income and equity securities. The mutual and commingled funds are valued using quoted market prices of the underlying securities.
-3	The Company's alternative investments include venture capital and partnership investments. Alternative investments are valued using the net asset value, which reflects the plan's share of the fair value of the investments.
The table below sets forth a summary of changes in the fair value of the Level 3 investments for the years ended March 31, 2015 and 2014 (in millions):
	Alternative				Insurance				Total
	Investments				Contracts
Beginning balance, March 31, 2013	$	52			$	12.3			$	64.3
Actual return on assets:
Related to assets held at reporting date	2.4				4.2				6.6
Related to assets sold during the period	0.1				—				0.1
Purchases, sales, issuances and settlements	(0.9		)		—				(0.9		)
Transfers in and/or out of Level 3	—				—				—
Ending balance, March 31, 2014	53.6				16.5				70.1
Actual return on assets:
Related to assets held at reporting date	(1.6		)		6.9				5.3
Related to assets sold during the period	2.3				—				2.3
Purchases, sales, issuances and settlements	(11.4		)		—				(11.4		)
Transfers in and/or out of Level 3	—				—				—
Ending balance, March 31, 2015	$	42.9			$	23.4			$	66.3
During fiscal 2016, the Company expects to contribute approximately $7.3 million to its U.S. qualified defined benefit plans and $2.7 million to its other postretirement benefit plans.
Expected benefit payments to be paid in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter are as follows (in millions):
Year Ending March 31:	Pension				Other
	Benefits				Postretirement
					Benefits
2016	$	40			$	2.7
2017	40.3				2.7
2018	40.6				2.8
2019	40.7				2.7
2020	40.8				2.6
2021-2025	204.6				10.8
Pension Plans That Are Not Fully Funded
At March 31, 2015, the projected benefit obligation, accumulated benefit obligation and fair value of plan assets for the pension plans with accumulated benefit obligations in excess of the fair value of plan assets were $717.1 million, $706.3 million and $541.5 million, respectively.
At March 31, 2014, the projected benefit obligation, accumulated benefit obligation and fair value of plan assets for the pension plans with accumulated benefit obligations in excess of the fair value of plan assets were $695.8 million, $687.2 million and $573.5 million, respectively.
Other Postretirement Benefits
The other postretirement benefit obligation was determined using an assumed health care cost trend rate of 7.0% in fiscal 2015 grading down to 5.0% in fiscal 2019 and thereafter. The discount rate, compensation rate increase and health care cost trend rate assumptions are determined as of the measurement date.
Assumed health care cost trend rates have a significant effect on amounts reported for the retiree medical plans. A one-percentage point change in assumed health care cost trend rates would have the following effect (in millions):
	One Percentage Point Increase											One Percentage Point Decrease
	Year Ended March 31,											Year Ended March 31,
	2015				2014				2013			2015				2014			2013
Increase (decrease) in total of service and interest cost components	$	0.1			$	0.1			$	0.1		$	(0.1	)		$	(0.1	)	$	(0.1	)
Increase (decrease) in postretirement benefit obligation	2.9				2.4				2.7			(2.5		)		(2.1		)	(2.3		)
Multi-Employer and Government-sponsored Plans
The Company participates in certain multi-employer and government-sponsored plans for eligible employees. Expense recognized related to these plans was $0.2 million, $0.3 million, and $0.3 million in the years ended March 31, 2015, 2014 and 2013, respectively.
Defined Contribution Savings Plans
The Company sponsors certain defined-contribution savings plans for eligible employees. Expense recognized related to these plans was $15.2 million, $15.6 million, and $14.2 million for the years ended March 31, 2015, 2014 and 2013, respectively.

Income_Taxes

Income Taxes	12 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes
	The provision for income taxes consists of amounts for taxes currently payable, amounts for tax items deferred to future periods, as well as adjustments relating to the Company’s determination of uncertain tax positions, including interest and penalties. The Company recognizes deferred tax assets and liabilities based on the future tax consequences attributable to tax net operating loss (“NOL”) carryforwards, tax credit carryforwards and differences between the financial statement carrying amounts and the tax bases of applicable assets and liabilities. Deferred tax assets are regularly reviewed for recoverability and valuation allowances are established based on historical losses, projected future taxable income and the expected timing of the reversals of existing temporary differences. As a result of this review, the Company continues to maintain a partial valuation allowance against its deferred tax assets relating to certain foreign and state NOL carryforwards and determined that its prior valuation allowance related to certain foreign tax credit carryforwards is no longer required.
	Income Tax Provision (Benefit)
	The components of the provision (benefit) for income taxes are as follows (in millions):
		Year ended March 31,
		2015			2014			2013
	Current:
	United States	$	17.2		$	0.8		$	0.1
	Non-United States	15.6			14.6			16.8
	State and local	4.7			1.6			0.5
	Total current	37.5			17			17.4
	Deferred:
	United States	(8.2		)	(8.6		)	6
	Non-United States	(10.5		)	(16.4		)	(7.0		)
	State and local	(2.0		)	(2.0		)	(1.0		)
	Total deferred	(20.7		)	(27.0		)	(2.0		)
	Provision (benefit) for income taxes	$	16.8		$	(10.0	)	$	15.4
	The provision (benefit) for income taxes differs from the United States statutory income tax rate due to the following items (in millions):
		Year ended March 31,
		2015			2014			2013
	Provision for income taxes at U.S. federal statutory income tax rate	$	37.9		$	5.2		$	21.9
	State and local income taxes, net of federal benefit	2.6			(1.1		)	2.5
	Net effects of foreign rate differential	(3.3		)	(3.6		)	(5.3		)
	Net effects of foreign related operations	8.9			5.7			(4.2		)
	Net effect to deferred taxes for changes in tax rates	0.2			0.6			(0.1		)
	Unrecognized tax benefits, net of federal benefit	(0.5		)	(4.7		)	0.2
	Domestic production activities deduction	(2.3		)	—			—
	Change in valuation allowance	(27.4		)	(11.5		)	—
	Other	0.7			(0.6		)	0.4
	Provision (benefit) for income taxes	$	16.8		$	(10.0	)	$	15.4
	The provision (benefit) for income taxes was calculated based upon the following components of income (loss) before income taxes (in millions):
		Year ended March 31,
		2015			2014			2013
	United States	$	89.9		$	(25.9	)	$	26
	Non-United States	18.7			40.9			36.7
	Income before income taxes	$	108.6		$	15		$	62.7
	Deferred Income Tax Assets and Liabilities
	Deferred income taxes consist of the tax effects of the following temporary differences (in millions):
		March 31, 2015			March 31, 2014
	Deferred tax assets:
	Compensation and retirement benefits	$	86.9		$	76.5
	US federal and state tax net operating loss carryforwards	27.8			63.1
	Foreign tax credit carryforwards	26.5			46.8
	Foreign net operating loss carryforwards	17.1			17.2
	Other	25.3			7.4
	Total deferred tax assets before valuation allowance	183.6			211
	Valuation allowance	(25.0		)	(54.4		)
	Total deferred tax assets	158.6			156.6
	Deferred tax liabilities:
	Property, plant and equipment	47.8			45.6
	Inventories	30.8			31.8
	Intangible assets and goodwill	218.5			222.7
	Cancellation of indebtedness	58.8			74.5
	Total deferred tax liabilities	355.9			374.6
	Net deferred tax liabilities	$	197.3		$	218
	These deferred tax assets and liabilities are classified in the consolidated balance sheets based on the balance sheet classification of the related assets and liabilities.
	Management has reviewed its deferred tax assets and has analyzed the uncertainty with respect to ultimately realizing the related tax benefits associated with such assets. Based upon this analysis, management has determined that a valuation allowance should be established for deferred tax assets relating to certain foreign and state NOL carryforwards as of March 31, 2015. Significant factors considered by management in this determination included the historical operating results of the Company as well as anticipated reversals of future taxable temporary differences. A valuation allowance was recorded at March 31, 2014 for deferred tax assets related to state NOL carryforwards, foreign NOL carryforwards and foreign tax credit carryforwards for which utilization was deemed uncertain. The significant reduction in the valuation allowance presented above was primarily due to a change in management's view that the realization of certain state NOL and foreign tax credit carryforwards (previously having a valuation allowance recorded) is now deemed more-likely-than-not, as well as write-offs of certain deferred tax assets as a result of the carryforward period expiring prior to utilization. The carryforward period for the foreign tax credit is ten years. The carryforward period for the U.S. federal NOL carryforward is twenty years. The carryforward periods for the state NOLs range from five to twenty years. Certain foreign NOL carryforwards are subject to a five-year expiration period, and the carryforward period for the remaining foreign NOLs is indefinite.
	As of March 31, 2015, the Company had approximately $520.5 million of state NOL carryforwards expiring over various years ending through March 31, 2034. The Company has a valuation allowance of $18.3 million recorded against the related deferred tax asset. In addition, at March 31, 2015, the Company had approximately $77.6 million of foreign NOL carryforwards in which the majority of these losses can be carried forward indefinitely. There exists a valuation allowance of $5.8 million against these foreign NOL carryforwards as well as other related deferred tax assets.
	No provision has been made for United States federal income taxes related to approximately $149.0 million of undistributed earnings of foreign subsidiaries that are considered to be permanently reinvested. Due to existing foreign tax credit carryforwards, the additional income tax liability that would result if such earnings were repatriated to the U.S., other than potential out-of-pocket withholding taxes of approximately $6.1 million, would not be expected to be significant to the Company’s consolidated financial statements.
	Net cash paid for income taxes to governmental tax authorities for the years ended March 31, 2015, 2014 and 2013 was $21.2 million, $13.6 million and $16.7 million, respectively.
	Liability for Unrecognized Tax Benefits
	The Company's total liability for unrecognized tax benefits as of March 31, 2015 and March 31, 2014 was $26.6 million and $23.6 million, respectively.
	The following table represents a reconciliation of the beginning and ending amount of the gross unrecognized tax benefits, excluding interest and penalties, for the fiscal years ended March 31, 2015 and March 31, 2014 (in millions):
		Year Ended March 31,
	2015			2014
Balance at beginning of period	$	20.9		$	24
Additions based on tax positions related to the current year	3.2			2.5
Additions for tax positions of prior years	—			—
Reductions for tax positions of prior years	—			—
Settlements	—			(0.8		)
Reductions due to lapse of applicable statute of limitations	(1.7		)	(4.7		)
Cumulative translation adjustment	(0.7		)	(0.1		)
Balance at end of period	$	21.7		$	20.9
The Company recognizes accrued interest and penalties related to unrecognized tax benefits in income tax expense. As of March 31, 2015 and March 31, 2014, the total amount of unrecognized tax benefits includes $12.4 million and $9.9 million of gross accrued interest and penalties, respectively. The amount of interest and penalties recorded as income tax (benefit) expense during the fiscal years ended March 31, 2015, 2014 and 2013 was $0.7 million, $(0.6) million, and $0.9 million, respectively.
The Company conducts business in multiple locations within and outside the U.S. Consequently, the Company is subject to periodic income tax examinations by domestic and foreign income tax authorities. Currently, the Company is undergoing routine, periodic income tax examinations in both domestic and foreign jurisdictions. The Internal Revenue Service is currently conducting fieldwork relating an income tax examination of the Company’s U.S. consolidated federal income tax return for the tax year ended March 31, 2013. During the first quarter of fiscal 2014, the Company completed an examination of its Italian corporate income tax returns for the tax years ended March 31, 2008 through March 31, 2011. Similarly, during the second quarter of fiscal 2014, the Company completed an examination of certain German subsidiaries’ corporate income and trade tax returns for the tax years ended March 31, 2006 through March 31, 2010. The Company paid approximately $0.7 million and $0.4 million upon the conclusion of the Italian and German examinations, respectively. However, these amounts did not have a negative financial statement impact to the company as the amounts were either previously reserved as an unrecognized tax benefit or appropriately accounted for as a deferred tax item. It appears reasonably possible that the amounts of unrecognized income tax benefits could change in the next twelve months as a result of such examinations; however, any potential payments of income tax, interest and penalties are not expected to be significant to the Company's consolidated financial statements. With certain exceptions, the Company is no longer subject to U.S. federal income tax examinations for tax years ending prior to March 31, 2012, state and local income tax examinations for years ending prior to fiscal 2011 or significant foreign income tax examinations for years ending prior to fiscal 2010. With respect to the Company's U.S. federal NOL carryforward as of March 31, 2014, the short tax period from July 21, 2006 to March 31, 2007 (due to the change in control when Apollo Management, L.P. acquired the Company) and the tax years ended March 31, 2008, 2009, 2010 and 2011 are open under statutes of limitations; whereby, the Internal Revenue Service may not adjust the income tax liability for these years, but may reduce the NOL carryforward and any other tax attribute carryforwards to future, open tax years.

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Mar. 31, 2015
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions
	Management Services Fee
	Until November 18, 2014, certain entities affiliated with Apollo Management L.P. (“Apollo”) owned more than 5% of the outstanding shares of our common stock. From 2006 to 2012, the Company had a management services agreement with an affiliate of Apollo for advisory and consulting services related to corporate management, finance, product strategy, investment, acquisitions and other matters relating to our business. As a result of the Company’s initial public offering (“IPO”), the Company and Apollo and its affiliates terminated the management consulting agreement, and in connection with the termination Apollo and its affiliates received $15.0 million (plus $0.7 million of unreimbursed expenses) from the Company in fiscal 2013. Such payment was negotiated as a reduced amount in lieu of the one-time termination fee of $20.1 million that Apollo otherwise would have been entitled to receive under the management consulting agreement, corresponding to the present value of the aggregate annual fees that would have been payable during the remainder of the term of the agreement (assuming a twelve-year term from the date of the amended agreement). No other costs or fees were incurred under the agreement in fiscal 2015, 2014 and 2013.
	Former Stockholders' Agreements
	In connection with Apollo's acquisition of the Company in 2006, the Company entered into two separate stockholders' agreements - one with Rexnord Acquisition Holdings I, LLC, Rexnord Acquisition Holdings II, LLC (together with Rexnord Acquisition Holdings I, LLC, the “Apollo Holders”) and certain other of its stockholders, and the other with the Apollo Holders, George M. Sherman (the Company's Chairman of the Board of Directors) and entities then-controlled by Mr. Sherman (collectively, the “Stockholders' Agreements”). All terms of the Stockholders' Agreements terminated upon the consummation of the Company's IPO, except for the registration rights provisions described below.
	Under the terms of the Stockholders' Agreements, the Company agreed to register shares of its common stock owned by affiliates of the Apollo Holders and by Mr. Sherman, as well as bear related expenses of offerings by them, in certain circumstances. Three times in fiscal 2015 and twice is fiscal 2014, the Apollo Holders exercised their registration rights with respect to their shares.
	Consequently, pursuant to the Stockholders’ Agreements, the Company was required to pay all of the offering expenses (other than underwriters’ discounts and commissions on the shares of common stock sold by the Apollo Holders or Mr. Sherman and affiliated entities) related to those offerings.  The offering expenses (excluding such underwriters’ discounts and commissions) paid by the Company on behalf of the selling stockholders were $0.5 million and $1.4 million for the offerings completed in fiscal 2015 and 2014, respectively. Following these offerings, Apollo no longer owns any shares of the Company's stock.
	Debt Transactions
	In fiscal 2013, the Company redeemed $300.0 million in aggregate principal amount of its then-outstanding 11.75% Notes, and paid early redemption premiums of $17.6 million and $7.4 million of accrued interest. Certain of the Company's affiliates, including Messrs. Sherman, Adams and a former executive officer were holders of the 11.75% Notes at the redemption date and, therefore, received payments of principal, as well as accrued interest and prepayment premiums, in respect of such indebtedness upon the redemption in the following amounts: $2.6 million, $0.3 million and $0.3 million, respectively.
	Other
	Apollo Global Securities, LLC, which was one of the underwriters in one of the fiscal 2015 securities offerings and each of the fiscal 2014 offerings, is an affiliate of Apollo.  Apollo Global Securities, LLC received (on a pro rata basis) discounts and commissions of approximately $0.1 million related to the sale of securities by Rexnord as part of the February 2014 offering.  The underwriters’ discounts and commissions related to the shares sold by Apollo or Mr. Sherman and affiliated entities in the fiscal 2015 and fiscal 2014 offerings were paid by them and not by the Company.
	Apollo Global Securities, LLC served as a joint lead arranger and joint bookrunner in the refinancing of our credit facilities in August 2013, and in connection with that transaction, received a structuring/arrangement fee from the Company of $0.6 million.
	One of the underwriters in the Company's IPO (Apollo Global Securities, LLC) is an affiliate of Apollo, and an affiliate of another underwriter in the IPO (Morgan Joseph TriArtisan LLC) is owned by an affiliate of Apollo. In fiscal 2013, those underwriters received customary discounts and commissions out of the Company's IPO proceeds in pro rata proportion to the other underwriters as follows: Apollo Global Securities LLC received $1.4 million and Morgan Joseph TriArtisan LLC received $0.3 million.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies
	The Company's subsidiaries are involved in various unresolved legal actions, administrative proceedings and claims in the ordinary course of business involving, among other things, product liability, commercial, employment, workers' compensation, intellectual property claims and environmental matters. The Company establishes accruals in a manner that is consistent with accounting principles generally accepted in the United States for costs associated with such matters when liability is probable and those costs are capable of being reasonably estimated. Although it is not possible to predict with certainty the outcome of these unresolved legal actions or the range of possible loss or recovery, based upon current information, management believes the eventual outcome of these unresolved legal actions, either individually or in the aggregate, will not have a material adverse effect on the financial position, results of operations or cash flows of the Company.
	In connection with the Carlyle acquisition in November 2002, Invensys plc ("Invensys") has provided the Company with indemnification against certain contingent liabilities, including certain pre-closing environmental liabilities. The Company believes that, pursuant to such indemnity obligations, Invensys is obligated to defend and indemnify the Company with respect to the matters described below relating to the Ellsworth Industrial Park Site and to various asbestos claims. The indemnity obligations relating to the matters described below are subject, together with indemnity obligations relating to other matters, to an overall dollar cap equal to the purchase price, which is an amount in excess of $900 million. The following paragraphs summarize the most significant actions and proceedings:
	•	In 2002, Rexnord Industries, LLC (“Rexnord Industries”) was named as a potentially responsible party (“PRP”), together with at least ten other companies, at the Ellsworth Industrial Park Site, Downers Grove, DuPage County, Illinois (the “Site”), by the United States Environmental Protection Agency (“USEPA”), and the Illinois Environmental Protection Agency (“IEPA”). Rexnord Industries' Downers Grove property is situated within the Ellsworth Industrial Complex. The USEPA and IEPA allege there have been one or more releases or threatened releases of chlorinated solvents and other hazardous substances, pollutants or contaminants, allegedly including but not limited to a release or threatened release on or from the Company's property, at the Site. The relief sought by the USEPA and IEPA includes further investigation and potential remediation of the Site and reimbursement of USEPA's past costs. Rexnord Industries' allocated share of past and future costs related to the Site, including for investigation and/or remediation, could be significant. All previously pending property damage and personal injury lawsuits against the Company related to the Site have been settled or dismissed. Pursuant to its indemnity obligation, Invensys continues to defend the Company in known matters related to the Site and has paid 100% of the costs to date.
	•	Multiple lawsuits (with approximately 700 claimants) are pending in state or federal court in numerous jurisdictions relating to alleged personal injuries due to the alleged presence of asbestos in certain brakes and clutches previously manufactured by the Company's Stearns division and/or its predecessor owners. Invensys and FMC, prior owners of the Stearns business, have paid 100% of the costs to date related to the Stearns lawsuits. Similarly, the Company's Prager subsidiary is a defendant in two pending multi-defendant lawsuits relating to alleged personal injuries due to the alleged presence of asbestos in a product allegedly manufactured by Prager. Additionally, there are numerous individuals who have filed asbestos related claims against Prager; however, these claims are currently on the Texas Multi-district Litigation inactive docket. The ultimate outcome of these asbestos matters cannot presently be determined. To date, the Company's insurance providers have paid 100% of the costs related to the Prager asbestos matters. The Company believes that the combination of its insurance coverage and the Invensys indemnity obligations will cover any future costs of these matters.
	In connection with the acquisition of The Falk Corporation (“Falk”), Hamilton Sundstrand has provided the Company with indemnification against certain products-related asbestos exposure liabilities. The Company believes that, pursuant to such indemnity obligations, Hamilton Sundstrand is obligated to defend and indemnify the Company with respect to the asbestos claims described below, and that, with respect to these claims, such indemnity obligations are not subject to any time or dollar limitations.
	The following paragraph summarizes the most significant actions and proceedings for which Hamilton Sundstrand has accepted responsibility:
	•	Falk, through its successor entity, is a defendant in multiple lawsuits pending in state or federal court in numerous jurisdictions relating to alleged personal injuries due to the alleged presence of asbestos in certain clutches and drives previously manufactured by Falk. There are approximately 50 claimants in these suits. The ultimate outcome of these lawsuits cannot presently be determined. Hamilton Sundstrand is defending the Company in these lawsuits pursuant to its indemnity obligations and has paid 100% of the costs to date.
	Certain Water Management subsidiaries are also subject to asbestos litigation. As of March 31, 2015, Zurn and numerous other unrelated companies were defendants in approximately 7,000 asbestos related lawsuits representing approximately 21,000 claims. Plaintiffs' claims allege personal injuries caused by exposure to asbestos used primarily in industrial boilers formerly manufactured by a segment of Zurn. Zurn did not manufacture asbestos or asbestos components. Instead, Zurn purchased them from suppliers. These claims are being handled pursuant to a defense strategy funded by insurers.
	As of March 31, 2015, the Company estimates the potential liability for the asbestos-related claims described above as well as the claims expected to be filed in the next ten years to be approximately $35.0 million of which Zurn expects its insurance carriers to pay approximately $27.0 million in the next ten years on such claims, with the balance of the estimated liability being paid in subsequent years. The $35.0 million was developed based on an actuarial study and represents the projected indemnity payout for claims filed in the next ten years. However, there are inherent uncertainties involved in estimating the number of future asbestos claims, future settlement costs, and the effectiveness of defense strategies and settlement initiatives. As a result, actual liability could differ from the estimate described herein. Further, while this current asbestos liability is based on an estimate of claims through the next ten years, such liability may continue beyond that time frame, and such liability could be substantial.
	Management estimates that its available insurance to cover this potential asbestos liability as of March 31, 2015, is approximately $248.1 million, and believes that all current claims are covered by insurance. However, principally as a result of the past insolvency of certain of the Company's insurance carriers, certain coverage gaps will exist if and after the Company's other carriers have paid the first $172.1 million of aggregate liabilities.
	As of March 31, 2015, the Company had a recorded receivable from its insurance carriers of $35.0 million, which corresponds to the amount of this potential asbestos liability that is covered by available insurance and is currently determined to be probable of recovery. However, there is no assurance that $248.1 million of insurance coverage will ultimately be available or that this asbestos liability will not ultimately exceed $248.1 million. Factors that could cause a decrease in the amount of available coverage include: changes in law governing the policies, potential disputes with the carriers regarding the scope of coverage, and insolvencies of one or more of the Company's carriers.
	The Company's subsidiaries, Zurn PEX, Inc. and Zurn Industries, LLC ("Zurn Industries") were named as defendants in a number of individual and class action lawsuits in various United States courts. The plaintiffs in these suits claimed damages due to the alleged failure or anticipated failure of Zurn brass fittings on the PEX plumbing systems in homes and other structures.
	In July 2012, the Company reached an agreement in principle to settle the liability underlying this litigation.  The settlement is designed to resolve, on a national basis, the Company's overall exposure for both known and unknown claims related to the alleged failure or anticipated failure of Zurn brass fittings on PEX plumbing systems, subject to the right of eligible class members to opt-out of the settlement and pursue their claims independently.  The settlement received final court approval in February 2013, and utilizes a seven year claims fund, which is capped at $20 million, and is funded in installments over the seven year period based on claim activity and minimum funding criteria.  The settlement also covers class action plaintiffs' attorneys' fees and expenses totaling $8.5 million, which were paid in fiscal 2014.
	Historically, the Company's insurance carrier had funded the Company's defense in the above referenced proceedings. The Company, however, reached a settlement agreement with its insurer, whereby the insurer paid the Company a lump sum in exchange for a release of future exposure related to this liability.
	The Company has recorded an accrual related to this brass fittings liability, which takes into account, in pertinent part, the insurance carrier contribution, as well as exposure from the claims fund, opt-outs and the waiver of future insurance coverage.
	In 2010, Sloan Valve Company (“Sloan”) filed a complaint against the Company’s subsidiary, Zurn Industries, for patent infringement in the United States District Court for the Northern District of Illinois. The complaint alleged, among other things, that Zurn Industries’ manual dual flush valve infringed Sloan’s patent for its “Flush Valve Handle Assembly Providing Dual Mode Operation” and sought an unspecified amount of damages, including a request for treble damages and attorneys’ fees. In June 2014, the court entered a consent judgment, consistent with a settlement agreement between Zurn Industries and Sloan, which included, among other things, a dismissal of all claims and counterclaims between the parties. The resolution of this case did not have a material adverse impact on the Company's consolidated results of operations.

Common_Stock_Public_Offerings

Common Stock Public Offerings	12 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Common Stock Public Offerings	Common stock public offerings
	Fiscal 2014 Common Stock Offering
	On February 5, 2014, the Company closed a public offering of shares of its common stock. As part of that offering, the Company sold 3,000,000 shares of common stock, at a public offering price of $25.75 per share for aggregate offering proceeds of $73.8 million, net of underwriting discounts and commissions and other direct costs of the offering.
	Fiscal 2013 Initial Public Offering
	On April 3, 2012, the Company closed the IPO of its common stock. In connection with the IPO, the Company registered its common stock with the SEC and subsequently offered and sold 27,236,842 shares of common stock, at a public offering price of $18.00 per share for aggregate offering proceeds of $458.3 million, net of $28.2 million of underwriting discounts and commissions and other direct costs of the offering.

Business_Segment_Information

Business Segment Information	12 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Business Segment Information	Business Segment Information
	The results of operations are reported in two business segments, consisting of the Process & Motion Control platform and the Water Management platform. The Process & Motion Control platform designs, manufactures, markets and services specified, highly engineered mechanical components used within complex systems where our customers' reliability requirements and cost of failure or downtime is extremely high. The Process & Motion Control product portfolio includes gears and gear drives, couplings, industrial bearings, FlatTop™ and engineered chain, aerospace bearings and seals, conveying equipment and specialty components, as well as, repair and on-going service, Rexnord Innovation Center and Rexnord Technical Services. This segment serves a diverse group of end markets, including mining, general industrial applications, cement and aggregates, agriculture, forest and wood products, petrochemical, energy, food & beverage, aerospace and wind energy. The Water Management platform designs, procures, manufactures and markets products that provide and enhance water quality, safety, flow control and conservation. The Water Management product portfolio includes specification drainage products, sensor flush valves and faucet products, point-source wastewater pretreatment devices, backflow prevention devices, pressure release valves, sluice and slide gates, butterfly and plug valves, control valves and actuation systems and PEX piping. The financial information of the Company's segments is regularly evaluated by the chief operating decision maker in determining resource allocation and assessing performance. Management evaluates the performance of each business segment based on its operating results. The same accounting policies are used throughout the organization (see Note 2).
	Business Segment Information:
	(in Millions)
			Year Ended
			March 31, 2015				March 31, 2014				March 31, 2013
	Net sales by product
	Process & Motion Control:
	Original equipment manufacturers/ end-users		$	642.1			$	621.1			$	570.8
	Aftermarket		588.1				617.1				633.7
	Total Process & Motion Control		$	1,230.20			$	1,238.20			$	1,204.50
	Water Management:
	Water safety, quality, flow control and conservation		517.1				465.6				430.1
	Water infrastructure		302.9				330.5				308.9
	Total Water Management		820				796.1				739
	Consolidated net sales		$	2,050.20			$	2,034.30			$	1,943.50
	Income (loss) from operations
	Process & Motion Control		$	219.6			$	237.7			$	219.7
	Water Management		79				72.2				67.9
	Corporate		(94.9		)		(37.5		)		(44.7		)
	Consolidated		$	203.7			$	272.4			$	242.9
	Non-operating expense:
	Interest expense, net		$	(87.9	)		$	(109.1	)		$	(153.3	)
	Loss on the extinguishment of debt		—				(133.2		)		(24.0		)
	Other expense, net		(7.2		)		(15.1		)		(2.9		)
	Income from continuing operations before income taxes		108.6				15				62.7
	Provision (benefit) provision for income taxes		16.8				(10.0		)		15.4
	Net income from continuing operations		$	91.8			$	25			$	47.3
	(Loss) income from discontinued operations, net of tax		(8.0		)		4.6				2.8
	Net income		83.8				29.6				50.1
	Non-controlling interest loss		—				(0.6		)		—
	Net income attributable to Rexnord		$	83.8			$	30.2			$	50.1
	Depreciation and Amortization
	Process & Motion Control		$	74.1			$	69.7			$	69.8
	Water Management		38.1				37.2				41.1
	Consolidated		$	112.2			$	106.9			$	110.9
	Capital Expenditures
	Process & Motion Control		$	37.7			$	39.4			$	39.6
	Water Management		11.1				12.8				20.5
	Consolidated		$	48.8			$	52.2			$	60.1
			March 31, 2015				March 31, 2014				March 31, 2013
	Total Assets
	Process & Motion Control		$	2,412.80			$	2,251.70			$	2,426.20
	Water Management		981.4				1,039.00				1,012.50
	Corporate		18.3				92.8				35.1
	Consolidated		$	3,412.50			$	3,383.50			$	3,473.80
	Net sales to third parties and long-lived assets by geographic region are as follows (in millions):
		Net Sales												Long-lived Assets
		Year Ended March 31, 2015				Year Ended March 31, 2014				Year Ended March 31, 2013				March 31, 2015		March 31, 2014		March 31, 2013
	United States	$	1,380.00			$	1,337.20			$	1,283.90			$	279.4	$	284.6	$	257.5
	Europe	374				409.1				379.5				92.1		98.6		93.1
	Rest of World	296.2				288				280.1				46.1		40.5		43.5
		$	2,050.20			$	2,034.30			$	1,943.50			$	417.6	$	423.7	$	394.1
	Net sales to third parties are attributed to the geographic regions based on the country in which the shipment originates. Amounts attributed to the geographic regions for long-lived assets are based on the location of the entity that holds such assets. In accordance with ASC 280, Segment Reporting, long-lived assets includes movable assets and excludes net intangible assets and goodwill.

Quarterly_Results_of_Operation

Quarterly Results of Operations	12 Months Ended
	Mar. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Quarterly Results of Operations	Quarterly Results of Operations (unaudited)
	(in millions, except per share amounts)
		Fiscal 2015
		First Quarter			Second Quarter			Third Quarter			Fourth Quarter			Total
	Net sales	$	503.6		$	531		$	497.1		$	518.5		$	2,050.20
	Gross profit	178.2			197			181.5			189.5			746.2
	Net income from continuing operations	11.6			37.8			6.7			35.7			91.8
	Income (loss) from discontinued operations, net of tax	0.4			(0.7		)	(4.5		)	(3.2		)	(8.0		)
	Net income	12			37.1			2.2			32.5			83.8
	Non-controlling interest (loss) income	(0.1		)	(0.1		)	—			0.2			—
	Net income attributable to Rexnord	12.1			37.2			2.2			32.3			83.8
	Net income per share from continuing operations:
	Basic	$	0.11		$	0.37		$	0.07		$	0.35		$	0.9
	Diluted	$	0.11		$	0.36		$	0.06		$	0.34		$	0.88
	Income (loss) per share from discontinued operations:
	Basic	$	—		$	(0.01	)	$	(0.04	)	$	(0.03	)	$	(0.08	)
	Diluted	$	—		$	(0.01	)	$	(0.04	)	$	(0.03	)	$	(0.08	)
	Net income per share attributable to Rexnord:
	Basic	$	0.12		$	0.37		$	0.02		$	0.32		$	0.82
	Diluted	$	0.12		$	0.36		$	0.02		$	0.31		$	0.8
		Fiscal 2014
		First Quarter			Second Quarter			Third Quarter			Fourth Quarter			Total
	Net sales	$	494		$	501.4		$	478.1		$	560.8		$	2,034.30
	Gross profit	178.1			189			178.9			207.4			753.4
	Net income (loss) from continuing operations	11.6			(53.6		)	27.4			39.6			25
	Income (loss) from discontinued operations, net of tax	2			1.1			1.2			0.3			4.6
	Net income (loss)	13.6			(52.5		)	28.6			39.9			29.6
	Non-controlling interest loss	(0.2		)	(0.2		)	(0.1		)	(0.1		)	(0.6		)
	Net income (loss) attributable to Rexnord	13.8			(52.3		)	28.7			40			30.2
	Net income (loss) per share from continuing operations:
	Basic	$	0.12		$	(0.55	)	$	0.28		$	0.4		$	0.25
	Diluted	$	0.12		$	(0.55	)	$	0.27		$	0.38		$	0.25
	Net income per share from discontinued operations:
	Basic	$	0.02		$	0.01		$	0.01		$	—		$	0.05
	Diluted	$	0.02		$	0.01		$	0.01		$	—		$	0.05
	Net income (loss) per share attributable to Rexnord:
	Basic	$	0.14		$	(0.54	)	$	0.29		$	0.4		$	0.31
	Diluted	$	0.14		$	(0.54	)	$	0.28		$	0.39		$	0.3

Schedule_II_Valuation_and_Qual

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Mar. 31, 2015
Valuation and Qualifying Accounts [Abstract]
Schedule of Valuation and Qualifying Accounts Disclosure	Schedule II – Valuation and Qualifying Accounts
	(in Millions)
				Additions
	Description	Balance at		Charged to		Acquired		Charged			Deductions			Balance at
		Beginning		Costs and		Obligations		to Other			-1			End of
		of Year		Expenses				Accounts						Year
	Fiscal Year 2013:
	Valuation allowance for trade and notes receivable	$	6.2	$	1.3	$	1.4	$	(0.7	)	$	(0.5	)	$	7.7
	Valuation allowance for excess and obsolete inventory	30.9		4.9		3.3		(4.2		)	(4.4		)	30.5
	Valuation allowance for income taxes	90.3		3.9		—		—			(21.1		)	73.1
	Fiscal Year 2014:
	Valuation allowance for trade and notes receivable	$	7.7	$	1	$	0.2	$	(0.1	)	$	(2.4	)	$	6.4
	Valuation allowance for excess and obsolete inventory	30.5		3.8		4.1		0.2			(4.8		)	33.8
	Valuation allowance for income taxes	73.1		3.9		—		—			(22.6		)	54.4
	Fiscal Year 2015:
	Valuation allowance for trade and notes receivable	$	6.4	$	10.7	$	0.6	$	(0.4	)	$	(0.5	)	$	16.8
	Valuation allowance for excess and obsolete inventory	33.8		5.2		0.8		(0.6		)	(3.5		)	35.7
	Valuation allowance for income taxes	54.4		2		—		—			(31.4		)	25
	(1) Uncollectible amounts, dispositions charged against the accrual and utilization of net operating losses.
	All other schedules have been omitted because they are not applicable or because the information required is included in the notes to the consolidated financial statements.

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	12 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Use of Estimates	Use of Estimates
	The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates.
Reclassifications	Reclassifications
	Certain prior year amounts have been reclassified to conform to the fiscal 2015 presentation.
Revenue Recognition	Revenue Recognition
	Net sales are recorded upon transfer of title and risk of product loss to the customer. Net sales relating to any particular shipment are based upon the amount invoiced for the delivered goods less estimated future rebate payments and sales returns which are based upon the Company’s historical experience. Revisions to these estimates are recorded in the period in which the facts that give rise to the revision become known. The value of returned goods during the years ended March 31, 2015, 2014 and 2013 was approximately 1.0% or less of net sales. Other than a standard product warranty, there are no post-shipment obligations.
	The Company classifies shipping and handling fees billed to customers as net sales and the corresponding costs are classified as cost of sales in the consolidated statements of operations.
Stock Based Compensation	Stock Based Compensation
	The Company accounts for stock based compensation in accordance with Accounting Standards Codification ("ASC") 718, Accounting for Stock Compensation ("ASC 718"). ASC 718 requires compensation costs related to stock-based payment transactions to be recognized in the financial statements. Generally, compensation cost is measured based on the grant-date fair value of the equity instruments issued. Compensation cost is recognized over the requisite service period, generally as the awards vest. See further discussion of the Company’s equity plans in Note 15.
Per Share Data	Per Share Data
	Basic net income (loss) per share from continuing and discontinued operations is computed by dividing net income from continuing operations and (loss) income from discontinued operations, respectively, by the corresponding weighted average number of common shares outstanding for the period. Diluted net income (loss) per share from continuing and discontinued operations is computed based on the weighted average number of common shares outstanding increased by the number of incremental shares that would have been outstanding if the potential dilutive shares were issued through the exercise of outstanding stock options to purchase common shares, except when the effect would be anti-dilutive.
Cash and Cash Equivalents	Cash and Cash Equivalents
	The Company considers all highly liquid investments with a maturity of three months or less to be cash and cash equivalents.
Receivables	Receivables
	Receivables are stated net of allowances for doubtful accounts of $16.8 million at March 31, 2015 and $6.4 million at March 31, 2014. The Company evaluates the collectability of its receivables and establishes the allowance for doubtful accounts based on a combination of specific customer circumstances and historical write-off experience. Credit is extended to customers based upon an evaluation of their financial position. Generally, advance payment is not required. Allowances for doubtful accounts established are recorded within Selling, general and administrative expenses within the Consolidated Statements of Operations.
Inventories	Inventories
	Inventories are comprised of material, direct labor and manufacturing overhead, and are stated at the lower of cost or market. Market is determined based on estimated net realizable values. Approximately 61% of the Company’s total inventories as of both March 31, 2015 and 2014 were valued using the “last-in, first-out” (LIFO) method. All remaining inventories are valued using the “first-in, first-out” (FIFO) method.
	In some cases, the Company has determined a certain portion of inventories are excess or obsolete. In those cases, the Company writes down the value of those inventories to their net realizable value based upon assumptions about future demand and market conditions. If actual market conditions are less favorable than those projected by management, additional inventory write-downs may be required.
Property, Plant and Equipment	Property, Plant and Equipment
	Property, plant and equipment are stated at cost. Depreciation is provided using the straight-line method over 10 to 30 years for buildings and improvements, 5 to 10 years for machinery and equipment and 3 to 5 years for computer hardware and software. Maintenance and repair costs are expensed as incurred.
Goodwill and Intangible Assets	Goodwill and Intangible Assets
	Intangible assets consist of acquired trademarks and tradenames, customer relationships (including distribution network) and patents. The customer relationships, patents, and certain tradenames are being amortized using the straight-line method over their estimated useful lives of 1 to 20 years, 2 to 15 years, and 5 to 10 years, respectively. Goodwill, trademarks and certain tradenames have indefinite lives and are not amortized but are tested annually for impairment using a discounted cash flow and market value approach analysis.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets
	The carrying value of long-lived assets, including amortizable intangible assets and tangible fixed assets, are evaluated for impairment whenever events or changes in circumstances indicate that the related carrying amounts may not be recoverable. Impairment of amortizable intangible assets and tangible fixed assets is generally determined by comparing projected undiscounted cash flows to be generated by the asset, or group of assets, to its carrying value. If impairment is identified, a loss is recorded equal to the excess of the asset's net book value over its fair value, and the cost basis is adjusted. Determination of the fair value requires various estimates including internal cash flow estimates generated from the asset, quoted market prices and appraisals as appropriate to determine fair value. Actual results could vary from these estimates
Product Warranty	Product Warranty
	The Company offers warranties on the sales of certain of its products and records an accrual for estimated future claims. Such accruals are based upon historical experience and management’s estimate of the level of future claims.
Income Taxes	Income Taxes
	The Company accounts for income taxes in accordance with ASC 740, Accounting for Income Taxes (“ASC 740”). Deferred income taxes are provided for future tax effects attributable to temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases, net operating losses, tax credits and other applicable carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be actually paid or recovered. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in the results of continuing operations in the period that includes the date of enactment.
	The Company regularly reviews its deferred tax assets for recoverability and provides a valuation allowance against its deferred tax assets if, based upon consideration of all positive and negative evidence, the Company determines that it is more-likely-than-not that a portion or all of the deferred tax assets will ultimately not be realized in future tax periods. Such positive and negative evidence would include review of historical earnings and losses, anticipated future earnings, the time period over which the temporary differences and carryforwards are anticipated to reverse and implementation of feasible, prudent tax planning strategies.
	The Company is subject to income taxes in the United States and numerous foreign jurisdictions. Significant judgment is required in determining the Company's worldwide provision for income taxes and recording the related deferred tax assets and liabilities. In the ordinary course of the Company's business, there is inherent uncertainty in quantifying the ultimate tax outcome of all of the numerous transactions and required calculations relating to the Company's tax positions. Accruals for unrecognized tax benefits are provided for in accordance with the requirements of ASC 740. An unrecognized tax benefit represents the difference between the recognition of benefits related to uncertain tax positions for income tax reporting purposes and financial reporting purposes. The Company has established a reserve for interest and penalties, as applicable, for uncertain tax positions and it is recorded as a component of the overall income tax provision.
	The Company is subject to periodic income tax examinations by domestic and foreign income tax authorities. Although the outcome of income tax examinations is always uncertain, the Company believes that it has appropriate support for the positions taken on its income tax returns and has adequately provided for potential income tax assessments. Nonetheless, the amounts ultimately settled relating to issues raised by the taxing authorities may differ materially from the amounts accrued for each year.
	See Note 17 for more information on income taxes.
Derivative Financial Instruments	Derivative Financial Instruments
	The Company is exposed to certain financial risks relating to fluctuations in foreign currency exchange rates and interest rates. The Company selectively uses foreign currency forward contracts and interest rate derivatives to manage its foreign currency and interest rate risks. All hedging transactions are authorized and executed pursuant to defined policies and procedures which prohibit the use of financial instruments for speculative purposes.
	The Company accounts for derivative instruments in accordance with ASC 815, Accounting for Derivative Instruments and Hedging Activities (“ASC 815”). ASC 815 requires companies to recognize all of its derivative instruments as either assets or liabilities in the balance sheet at fair value. Fair value is defined under ASC 820, Fair Value Measurements and Disclosures (“ASC 820”), as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants. See more information as it relates to applying fair value to derivative instruments at Note 13. The accounting for changes in the fair value of a derivative instrument depends on whether the derivative instrument has been designated and qualifies as part of a hedging relationship and further, on the type of hedging relationship. As of March 31, 2015, the Company had forward-starting interest rate swaps and interest rate caps on its variable rate term debt that are designated and qualify as hedging instruments. For the derivative instruments designated and qualifying as effective hedging instruments under ASC 815, the changes in the fair value of the effective portion of the instrument are recognized in accumulated other comprehensive loss whereas any changes in the fair value of a derivative instrument that is not designated or does not qualify as an effective hedge are recorded in other non-operating expense. See Note 12 for further information regarding the classification and accounting for the Company’s derivative financial instruments.
	Financial Instrument Counterparties
	The Company is exposed to credit losses in the event of non-performance by counterparties to its financial instruments. The Company anticipates, however, that counterparties will be able to fully satisfy their obligations under these instruments. The Company places cash and temporary investments and foreign currency and interest rate swap and cap contracts with various high-quality financial institutions. Although the Company does not obtain collateral or other security to support these financial instruments, it does periodically evaluate the credit-worthiness of each of its counterparties.
Foreign Currency Translation	Foreign Currency Translation
	Assets and liabilities of subsidiaries operating outside of the United States with a functional currency other than the U.S. dollar are translated into U.S. dollars using exchange rates at the end of the respective period. Revenues and expenses of such entities are translated at average exchange rates in effect during the respective period. Foreign currency translation adjustments are included as a component of accumulated other comprehensive loss. Currency transaction losses are included in other expense, net in the consolidated statements of operations
Advertising Costs	Advertising Costs
	Advertising costs are charged to selling, general and administrative expenses as incurred
Research, Development and Engineering Costs	Research, Development and Engineering Costs
	Research, development and engineering costs are charged to selling, general and administrative expenses as incurred
Concentrations of Credit Risk	Concentrations of Credit Risk
	Financial instruments that potentially subject the Company to significant concentrations of credit risk consist of cash and temporary investments, forward currency contracts and trade accounts receivable.
Recent Accounting Pronouncements	Recent Accounting Pronouncements
	In March 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-08, Presentation of Financial Statements and Property, Plant, and Equipment: Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity ("ASU 2014-08"), which changes the criteria for reporting discontinued operations. ASU 2014-08 allows only disposals representing a strategic shift in operations to be presented as discontinued operations. Those strategic shifts should have a major effect on the organization’s operations and financial results. In addition, the new guidance requires expanded disclosures about discontinued operations, as well as pre-tax income attributable to a disposal of a significant part of an organization that does not qualify for discontinued operations reporting. ASU 2014-08 will be effective for the Company in the first quarter of fiscal 2016. As this guidance is a prospective change, adoption of this standard is not expected to have a material impact on the Company's results of operations, financial position or cash flows.
	In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers in order to develop a common revenue standard for U.S. GAAP and International Financial Reporting Standards. The guidance specifies revenue should be recognized in the amount that reflects the consideration the company expects to be entitled to in exchange for the transfer of promised goods or services to customers. ASU 2014-09 will be effective for the Company in the first quarter of fiscal 2017 and allows for full retrospective adoption applied to all periods presented or retrospective adoption with the cumulative effect of initially applying this update recognized at the date of initial application. The Company is currently evaluating the method of adoption and the potential impact adoption will have on its consolidated financial statements.
	In April 2015, the FASB issued ASU No. 2015-03, Simplifying the Presentation of Debt Issuance Costs ("ASU 2015-03"). ASU 2015-03 requires debt issuance costs related to a recognized debt liability to be presented in the balance sheet as a direct deduction from the debt liability rather than as an asset. ASU 2015-03 will be effective for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. The Company is currently evaluating the impact adoption of this standard will have on its consolidated financial statements.

Significant_Accounting_Policie2

Significant Accounting Policies (Tables)	12 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Schedule of Product Warranty Liability	The following table presents changes in the Company’s product warranty liability during each of the periods presented (in millions):
		Year Ended March 31, 2015			Year Ended March 31, 2014			Year Ended March 31, 2013
	Balance at beginning of period	$	8		$	7.7		$	7.7
	Acquired obligations	—			0.2			—
	Charged to operations	1.8			3.9			3.6
	Claims settled	(3.0		)	(3.8		)	(3.6		)
	Balance at end of period	$	6.8		$	8		$	7.7
Schedule of Accumulated Other Comprehensive Loss	The changes in accumulated other comprehensive loss, net of tax, for the fiscal years ending March 31, 2015, 2014 and 2013 are as follows (in millions):
		Interest Rate Derivatives			Foreign Currency Translation			Pension and Postretirement Plans			Total
	Balance April 1, 2012	$	—		$	15		$	(26.3	)	$	(11.3	)
	Other comprehensive loss before reclassifications	—			(14.3		)	(12.2		)	(26.5		)
	Amounts reclassified from accumulated other comprehensive loss	—			—			(0.9		)	(0.9		)
	Net current period other comprehensive loss	—			(14.3		)	(13.1		)	(27.4		)
	Balance at March 31, 2013	—			0.7			(39.4		)	(38.7		)
	Balance April 1, 2013	—			0.7			(39.4		)	(38.7		)
	Other comprehensive (loss) income before reclassifications	(1.7		)	7.1			10.5			15.9
	Amounts reclassified from accumulated other comprehensive loss	—			—			(1.0		)	(1.0		)
	Net current period other comprehensive (loss) income	(1.7		)	7.1			9.5			14.9
	Balance at March 31, 2014	(1.7		)	7.8			(29.9		)	(23.8		)
	Balance April 1, 2014	(1.7		)	7.8			(29.9		)	(23.8		)
	Other comprehensive loss before reclassifications	(10.9		)	(84.3		)	(14.1		)	(109.3		)
	Amounts reclassified from accumulated other comprehensive loss	—			—			2.9			2.9
	Net current period other comprehensive loss	(10.9		)	(84.3		)	(11.2		)	(106.4		)
	Balance at March 31, 2015	$	(12.6	)	$	(76.5	)	$	(41.1	)	$	(130.2	)
Reclassification out of Accumulated Other Comprehensive Loss	The following table summarizes the amounts reclassified from accumulated other comprehensive loss to net income during the fiscal years ending March 31, 2015, 2014 and 2013 (in millions):
	Pension and postretirement plans	Year Ending March 31, 2015			Year Ending March 31, 2014			Year Ending March 31, 2013			Income Statement Line Item
	Amortization of prior service credit	$	(1.7	)	$	(1.7	)	$	(1.4	)	Selling, general and administrative expenses
	Lump Sum Settlement	6.5			—			—			Actuarial loss on pension and postretirement benefit obligations
	(Benefit) provision for income taxes	(1.9		)	0.7			0.5
	Total, net of income taxes	$	2.9		$	(1.0	)	$	(0.9	)
Research, Development and Engineering Costs	Research, development and engineering costs are charged to selling, general and administrative expenses as incurred and for the years ended March 31, 2015, 2014 and 2013 amounted to the following (in millions):
		Year Ended March 31, 2015			Year Ended March 31, 2014			Year Ended March 31, 2013
	Research and development costs	$	12.8		$	13		$	13.7
	Engineering costs	26			28.4			24.3
	Total	$	38.8		$	41.4		$	38

Discontinued_Operations_Tables

Discontinued Operations (Tables)	12 Months Ended
	Mar. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Results of Discontinued Operations	The following table summarizes the results of the Mill Products business included within (loss) income from discontinued operations, net of tax on the Consolidated Statements of Operations (in millions):
		Year Ended
		31-Mar-15			31-Mar-14		31-Mar-13
	Net sales	$	34.1		$	47.7	$	61.6
	(Loss) income from operations before income taxes	(10.9		)	7.2		12.5
	(Benefit) provision for income taxes	(2.9		)	2.6		4.9
	Net (loss) income	$	(8.0	)	$	4.6	$	7.6
	Net (loss) income per share from discontinued operations:
	Basic	$	(0.08	)	$	0.05	$	0.08
	Diluted	$	(0.08	)	$	0.05	$	0.08

Restructuring_and_Other_Simila1

Restructuring and Other Similar Costs (Tables)	12 Months Ended
	Mar. 31, 2015
Restructuring and Related Activities [Abstract]
Restructuring Costs by Operating Segment	The following table summarizes the Company's restructuring and other similar costs incurred during the years ended March 31, 2015, 2014 and 2013 by classification of operating segment (in millions):
			Year Ended March 31, 2015
			Process & Motion Control			Water Management			Corporate			Consolidated
	Severance costs		$	7.6		$	3.3		$	—		$	10.9
	Lease termination and other costs		1.2			0.8			—			2
	Total restructuring and other similar costs		$	8.8		$	4.1		$	—		$	12.9
			Year Ended March 31, 2014
			Process & Motion Control			Water Management			Corporate			Consolidated
	Severance costs		$	3.3		$	2		$	0.8		$	6.1
	Lease termination and other costs		1.6			0.7			—			2.3
	Total restructuring and other similar costs		$	4.9		$	2.7		$	0.8		$	8.4
			Year Ended March 31, 2013
			Process & Motion Control			Water Management			Corporate			Consolidated
	Severance costs		$	5.3		$	1.5		$	—		$	6.8
	Lease termination and other costs		1.1			0.7			—			1.8
	Total restructuring and other similar costs		$	6.4		$	2.2		$	—		$	8.6
			Restructuring Costs To-date (Period from April 1, 2012 to March 31, 2015)
			Process & Motion Control			Water Management			Corporate			Consolidated
	Severance costs		$	16.2		$	6.8		$	0.8		$	23.8
	Lease termination and other costs		3.9			2.2			—			6.1
	Total restructuring and other similar costs		$	20.1		$	9		$	0.8		$	29.9
Accrual For Restructuring Costs	The following table summarizes the activity in the Company's accrual for restructuring costs for the fiscal years ended March 31, 2015 and 2014 (in millions):
			Severance Costs			Lease Termination and Other Costs			Total
	Accrued Restructuring Costs, March 31, 2013		$	3.7		$	0.1		$	3.8
	Charges		6.1			2.3			8.4
	Cash payments		(6.4		)	(2.0		)	(8.4		)
	Accrued Restructuring Costs, March 31, 2014 (1)		3.4			0.4			3.8
	Charges		10.9			2			12.9
	Cash payments		(7.6		)	(1.3		)	(8.9		)
	Non-cash charges		—			(0.8		)	(0.8		)
	Accrued Restructuring Costs, March 31, 2015 (1)		$	6.7		$	0.3		$	7
	-1	Accrued restructuring costs are included in other current liabilities in the consolidated balance sheets.

Inventories_Tables

Inventories (Tables)	12 Months Ended
	Mar. 31, 2015
Inventory Disclosure [Abstract]
Major Classes of Inventories	The major classes of inventories are summarized as follows (in millions):
		March 31,
		2015		2014
	Finished goods	$	146	$	148.4
	Work in progress	69.6		72.5
	Purchased components	85.2		75.8
	Raw materials	61.1		61.1
	Inventories at First-in, First-Out ("FIFO") cost	361.9		357.8
	Adjustment to state inventories at Last-in, First-Out ("LIFO") cost	5.8		1.9
		$	367.7	$	359.7

Property_Plant_and_Equipment_T

Property, Plant and Equipment (Tables)	12 Months Ended
	Mar. 31, 2015
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, plant and equipment, net is summarized as follows (in millions):
		March 31,
		2015			2014
	Land	$	33.5		$	32.1
	Buildings and improvements	217.7			215.6
	Machinery and equipment	388.2			390.7
	Hardware and software	61.5			62.5
	Construction in-progress	25.9			23.5
		726.8			724.4
	Less accumulated depreciation	(309.2		)	(301.3		)
		$	417.6		$	423.1

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in the Net Carrying Value of Goodwill and Identifiable Intangible Assets	The changes in the net carrying value of goodwill and identifiable intangible assets for the years ended March 31, 2015 and 2014 by operating segment, are presented below (in millions):
										Amortizable Intangible Assets
			Goodwill			Indefinite Lived Intangible Assets				Trade-Names			Customer Relationships			Patents			Total Identifiable Intangible Assets Excluding Goodwill
	Process & Motion Control
	Net carrying amount as of March 31, 2013		$	877.1		$	193.9			$	—		$	104.9		$	4.9		$	303.7
	Acquisitions		21.9			2.7				2			18.3			—			23
	Purchase price allocation adjustments		1.1			—				—			—			—
	Amortization		—			—				(0.1		)	(29.3		)	(1.2		)	(30.6		)
	Currency translation adjustment and other		3.9			1				—			0.5			—			1.5
	Net carrying amount as of March 31, 2014		$	904		$	197.6			$	1.9		$	94.4		$	3.7		$	297.6
	Acquisitions		54.7			—				5.2			51.6			—			56.8
	Purchase price allocation adjustments		1.8			(3.1		)		1.3			—			—			(1.8		)
	Amortization		—			—				(1.0		)	(31.0		)	(1.2		)	(33.2		)
	Currency translation adjustment and other (1)		(10.6		)	(1.6		)		(0.1		)	(2.0		)	—			(3.7		)
	Net carrying amount as of March 31, 2015		$	949.9		$	192.9			$	7.3		$	113		$	2.5		$	315.7
	Water Management
	Net carrying amount as of March 31, 2013		$	241.3		$	138.1			$	—		$	162.8		$	8.9		$	309.8
	Acquisitions		3			1.2				—			0.9			—			2.1
	Amortization		—			—				—			(18.4		)	(1.8		)	(20.2		)
	Currency translation adjustment and other		2.4			1.5				—			1.7			0.1			3.3
	Net carrying amount as of March 31, 2014		$	246.7		$	140.8			$	—		$	147		$	7.2		$	295
	Acquisitions		20			—				1.6			7.3			1.5			10.4
	Amortization		—			—				(0.2		)	(19.4		)	(2.3		)	(21.9		)
	Currency translation adjustment and other		(14.3		)	(5.6		)		—			(5.8		)	(0.1		)	(11.5		)
	Net carrying amount as of March 31, 2015		$	252.4		$	135.2			$	1.4		$	129.1		$	6.3		$	272
	Consolidated
	Net carrying amount as of March 31, 2013		$	1,118.40		$	332			$	—		$	267.7		$	13.8		$	613.5
	Acquisitions		24.9			3.9				2			19.2			—			25.1
	Purchase price allocation adjustments		1.1			—				—			—			—			—
	Amortization		—			—				(0.1		)	(47.7		)	(3.0		)	(50.8		)
	Currency translation adjustment and other		6.3			2.5				—			2.2			0.1			4.8
	Net carrying amount as of March 31, 2014		$	1,150.70		$	338.4			$	1.9		$	241.4		$	10.9		$	592.6
	Acquisitions		74.7			—				6.8			58.9			1.5			67.2
	Purchase price allocation adjustments		1.8			(3.1		)		1.3			—			—			(1.8		)
	Amortization		—			—				(1.2		)	(50.4		)	(3.5		)	(55.1		)
	Currency translation adjustment and other (1)		(24.9		)	(7.2		)		(0.1		)	(7.8		)	(0.1		)	(15.2		)
	Net carrying amount as of March 31, 2015		$	1,202.30		$	328.1			$	8.7		$	242.1		$	8.8		$	587.7
	(1) Includes $4.1 million of goodwill allocated to the Mill Products business in connection to the Company's decision to discontinue the Mill Products business during fiscal 2015. See Note 4 for additional information regarding the discontinued operation.
Gross Carrying Amount and Accumulated Amortization of Identifiable Intangible Assets	The gross carrying amount and accumulated amortization for each major class of identifiable intangible assets as of March 31, 2015 and March 31, 2014 are as follows (in millions):
				March 31, 2015
		Weighted Average Useful Life		Gross Carrying Amount			Accumulated Amortization				Net Carrying Amount
	Intangible assets subject to amortization:
	Patents	10 years		$	40.1		$	(31.3	)		$	8.8
	Customer relationships (including distribution network)	13 years		635.4			(393.3		)		242.1
	Tradenames	8 years		10			(1.3		)		8.7
	Intangible assets not subject to amortization - trademarks and tradenames			328.1			—				328.1
				$	1,013.60		$	(425.9	)		$	587.7
				March 31, 2014
		Weighted Average Useful Life		Gross Carrying Amount			Accumulated Amortization				Net Carrying Amount
	Intangible assets subject to amortization:
	Patents	10 years		$	38.7		$	(27.8	)		$	10.9
	Customer relationships (including distribution network)	12 years		584.3			(342.9		)		241.4
	Tradenames	7 years		2			(0.1		)		1.9
	Intangible assets not subject to amortization - trademarks and tradenames			338.4			—				338.4
				$	963.4		$	(370.8	)		$	592.6

Other_Current_Liabilities_Tabl

Other Current Liabilities (Tables)	12 Months Ended
	Mar. 31, 2015
Other Liabilities Disclosure [Abstract]
Other Current Liabilities	Other current liabilities are summarized as follows (in millions):
		March 31,
		2015		2014
	Customer advances	$	7	$	8.1
	Sales rebates	25.4		22.7
	Commissions	3.9		7.9
	Restructuring and other similar charges (1)	7		3.8
	Product warranty (2)	6.8		8
	Risk management (3)	9.4		9.1
	Legal and environmental	3.8		4.5
	Deferred income taxes	12.9		10.9
	Taxes, other than income taxes	8		9.5
	Income taxes payable	17.9		11.2
	Interest payable	5.5		—
	Other	19.7		16.5
		$	127.3	$	112.2
	____________________
	-1	See more information related to the restructuring obligations balance within Note 5.
	-2	See more information related to the product warranty obligations balance within Note 2.
	-3	Includes projected liabilities related to losses arising from automobile, general and product liability claims.

LongTerm_Debt_Tables

Long-Term Debt (Tables)	12 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Summary of Long-Term Debt	Long-term debt is summarized as follows (in millions):
			March 31,
			2015		2014
	Term loans (1)		1,905.40		1,921.90
	8.875% Senior notes due 2016		1.3		1.3
	Other (2)		43.8		48.8
	Total		1,950.50		1,972.00
	Less current maturities		24.3		29
	Long-term debt		$	1,926.20	$	1,943.00
	____________________
	-1	Includes an unamortized original issue discount of $15.4 million and $18.3 million at March 31, 2015 and March 31, 2014, respectively.
	-2	Includes financing related to the Company's participation in the New Market Tax Credit incentive program of $37.4 million as of March 31, 2015 and 2014.
Schedule of Maturities of Long-Term Debt	Future maturities of debt as of March 31, 2015, excluding the unamortized original issue discount of $15.4 million from the Term Loan, were as follows (in millions):
	Years ending March 31:
	2016	$	24.3
	2017	21.5
	2018	19.7
	2019	19.7
	2020	19.5
	Thereafter	1,861.20
		$	1,965.90

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	12 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair Value of Derivative Instruments	Fair value of derivatives designated as hedging instruments under ASC 815 (in millions):
		31-Mar-15				31-Mar-14				Balance Sheet Classification
		Liability Derivatives
	Interest rate swaps	$	17.7			$	2.7			Other liabilities
		Asset Derivatives
	Interest rate caps	$	3			$	—			Other assets
	Fair value of derivatives not designated as hedging instruments under ASC 815 (in millions):
		March 31, 2015				March 31, 2014				Balance Sheet Classification
		Asset Derivatives
	Foreign currency forward contracts	$	0.4			$	0.1			Other current assets
Location and Amount of Losses and Gains - Derivative Instruments	The following tables indicate the location and the amount of losses and gains associated with the Company's derivative instruments, net of tax, within the consolidated balance sheets (for qualifying ASC 815 instruments) and recognized within the consolidated statements of operations. The information is segregated between designated, qualifying ASC 815 hedging instruments and non-qualifying, non-designated hedging instruments (in millions). As of March 31, 2015, there was no ineffectiveness on the Company's designated hedging instruments.
		Amount of loss recognized in accumulated other comprehensive loss on derivatives
	Derivative instruments designated as cash flow hedging relationships under ASC 815
		March 31, 2015				March 31, 2014
	Interest rate swaps	$	9.2			$	1.7
	Interest rate caps	$	1.7			$	—
				Amount recognized in other expense, net
	Derivative instruments not designated as hedging instruments under ASC 815	Location of gain recognized in income on derivatives		Year Ended
				March 31, 2015				March 31, 2014			March 31, 2013
	Foreign currency forward contracts	Other income (expense), net		$	0.5			$	0.4		$	0.5

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Assets and Liabilities Recognized at Fair Value on a Recurring Basis	The following table provides a summary of the Company's assets and liabilities that were recognized at fair value on a recurring basis as of March 31, 2015 and March 31, 2014 (in millions):
		Fair Value as of March 31, 2015
		Level 1		Level 2		Level 3		Total
	Assets:
	Interest rate caps	$	—	$	3	$	—	$	3
	Foreign currency forward contracts	—		0.4		—		0.4
	Total assets at fair value	$	—	$	3.4	$	—	$	3.4
	Liabilities:
	Interest rate swaps	$	—	$	17.7	$	—	$	17.7
	Total liabilities at fair value	$	—	$	17.7	$	—	$	17.7
		Fair Value as of March 31, 2014
		Level 1		Level 2		Level 3		Total
	Assets:
	Foreign currency forward contracts	$	—	$	0.1	$	—	$	0.1
	Total assets at fair value	$	—	$	0.1	$	—	$	0.1
	Liabilities:
	Interest rate swaps	$	—	$	2.7	$	—	$	2.7
	Total liabilities at fair value	$	—	$	2.7	$	—	$	2.7

Leases_Tables

Leases (Tables)	12 Months Ended
	Mar. 31, 2015
Leases [Abstract]
Future Minimum Rental Payments for Operating Leases	Future minimum rental payments for operating leases with initial terms in excess of one year as of March 31, 2015 are as follows (in millions):
	Years ending March 31:
	2016	$	14.8
	2017	11.5
	2018	9.5
	2019	7.8
	2020	6.9
	Thereafter	4.4
		$	54.9

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	12 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Fair Value of Options Granted	The fair value of each option granted under the Incentive Plans was estimated on the date of grant using the Black-Scholes valuation model that uses the following weighted-average assumptions:
		Year Ended March 31, 2015		Year Ended March 31, 2014		Year Ended March 31, 2013
	Expected option term (in years)	7.1		7.5		7.5
	Expected volatility factor	26	%	35	%	34	%
	Weighted-average risk free interest rate	2.1	%	1.57	%	1.71	%
	Expected dividend rate	0	%	0	%	0	%
Schedule of Stock Options Activity	Other information relative to stock options and the changes period over period are as follows:
		Year-Ended March 31, 2015					Year-Ended March 31, 2014				Year-Ended March 31, 2013
		Shares		Weighted Avg. Exercise Price			Shares		Weighted Avg. Exercise Price		Shares		Weighted Avg. Exercise Price
	Number of shares under options:
	Outstanding at beginning of period	8,652,834		$	10.79		9,450,197		$	9.85	10,874,371		$	5.27
	Granted	1,268,124		28.3			978,849		19.82		2,626,157		20.56
	Exercised (1)	(743,807	)	5.85			(1,154,011	)	5.91		(3,746,740	)	3.77
	Canceled/Forfeited	(588,633	)	21.65			(622,201	)	19.91		(303,591	)	13.58
	Outstanding at end of period (2)	8,588,518		$	13.06		8,652,834		$	10.79	9,450,197		$	9.85
	Exercisable at end of period (3)	4,798,457		$	5.67		5,225,236		$	5.46	5,879,052		$	5.3
	______________________
	-1	The total intrinsic value of options exercised during fiscal 2015, 2014 and 2013 was $16.7 million, $18.7 million and $56.1 million, respectively.
	-2	The weighted average remaining contractual life of options outstanding was 5.0 years at March 31, 2015, 5.5 years at March 31, 2014 and 6.1 years at March 31, 2013. The aggregate intrinsic value of options outstanding at March 31, 2015 was $119.1 million.
	-3	The weighted average remaining contractual life of options exercisable was 2.6 years at March 31, 2015, 3.7 years at March 31, 2014 and 4.6 years at March 31, 2013. The aggregate intrinsic value of options exercisable at March 31, 2015 was $100.9 million.
		Shares		Weighted
				Average  Grant
				Date Fair Value
	Non-vested options at March 31, 2014	3,427,598		$	7.62
	Granted	1,268,124		9.21
	Vested	(318,774	)	3.99
	Canceled/Forfeited	(588,633	)	8.43
	Non-vested options at March 31, 2015	3,788,315		$	8.33

Retirement_Benefits_Tables

Retirement Benefits (Tables)	12 Months Ended
	Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Components of Net Benefit Costs	The components of net periodic benefit cost reported in the consolidated statements of operations are as follows (in millions):
		Year Ended
		March 31, 2015				March 31, 2014				March 31, 2013
	Pension Benefits:
	Service cost	$	1.4			$	1.8			$	1.9
	Interest cost	30				30.1				31.6
	Expected return on plan assets	(29.8		)		(30.5		)		(31.9		)
	Amortization of:
	Prior service cost	0.2				0.2				0.6
	Curtailment loss	—				—				0.2
	Settlement loss	6.5				—				—
	Recognition of actuarial losses	51.7				2.7				7.2
	Net periodic benefit cost	$	60			$	4.3			$	9.6
	Other Postretirement Benefits:
	Service cost	$	0.1			$	0.1			$	0.1
	Interest cost	1.3				1.2				1.5
	Amortization:
	Prior service credit	(1.9		)		(1.9		)		(2.0		)
	Recognition of actuarial losses (gains)	1.2				—				(1.7		)
	Net periodic benefit cost	$	0.7			$	(0.6	)		$	(2.1	)
Summary of the Plan's Status	The status of the plans are summarized as follows (in millions):
		Pension Benefits								Other Postretirement Benefits
		Year Ended March 31, 2015				Year Ended March 31, 2014				Year Ended March 31, 2015			Year Ended March 31, 2014
	Benefit obligation at beginning of period	$	(700.0	)		$	(720.6	)		$	(31.2	)	$	(33.6	)
	Service cost	(1.4		)		(1.8		)		(0.1		)	(0.1		)
	Interest cost	(30.0		)		(30.1		)		(1.3		)	(1.2		)
	Actuarial (losses) gains	(114.2		)		18.2				(2.1		)	0.4
	Plan amendments	—				0.2				—			—
	Benefits paid	40.8				38.5				3.2			4.1
	Plan participant contributions	(0.4		)		(0.4		)		(0.9		)	(0.8		)
	Settlements	65				—				—			—
	Translation adjustment	21.4				(4.0		)		—			—
	Benefit obligation at end of period	$	(718.8	)		$	(700.0	)		$	(32.4	)	$	(31.2	)
	Plan assets at the beginning of the period	$	577.7			$	577.7			$	—		$	—
	Actual return on plan assets	65				25.6				—			—
	Contributions	12.5				12.8				3.2			4.1
	Benefits paid	(40.8		)		(38.5		)		(3.2		)	(4.1		)
	Settlements	(65.0		)		—				—			—
	Translation adjustment	(6.2		)		0.1				—			—
	Plan assets at end of period	$	543.2			$	577.7			$	—		$	—
	Funded status of plans	$	(175.6	)		$	(122.3	)		$	(32.4	)	$	(31.2	)
	Net amount on Consolidated Balance Sheets consists of:
	Current liabilities	$	(2.3	)		$	(3.0	)		$	(2.7	)	$	(2.8	)
	Long-term liabilities	(173.3		)		(119.3		)		(29.7		)	(28.4		)
	Total net funded status	$	(175.6	)		$	(122.3	)		$	(32.4	)	$	(31.2	)
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized	Amounts included in accumulated other comprehensive loss (income), net of tax, related to defined benefit plans at March 31, 2015 and 2014 consist of the following (in millions):
		As of March 31, 2015
		Pension				Postretirement				Total
		Benefits				Benefits
	Unrecognized prior service cost (credit)	$	0.2			$	(7.1	)		$	(6.9	)
	Unrecognized actuarial loss	71.7				1.2				72.9
	Accumulated other comprehensive loss (income), gross	71.9				(5.9		)		66
	Deferred income tax (benefit) provision	(27.4		)		2.5				(24.9		)
	Accumulated other comprehensive loss (income), net	$	44.5			$	(3.4	)		$	41.1
		As of March 31, 2014
		Pension				Postretirement				Total
		Benefits				Benefits
	Unrecognized prior service cost (credit)	$	0.5			$	(9.1	)		$	(8.6	)
	Unrecognized actuarial loss	54.9				0.4				55.3
	Accumulated other comprehensive loss (income), gross	55.4				(8.7		)		46.7
	Deferred income tax (benefit) provision	(19.7		)		2.9				(16.8		)
	Accumulated other comprehensive loss (income), net	$	35.7			$	(5.8	)		$	29.9
Schedule of Assumptions Used	The following table presents significant assumptions used to determine benefit obligations and net periodic benefit cost (income) in weighted-average percentages:
		Pension Benefits									Other Postretirement Benefits
		March 31, 2015			March 31, 2014			March 31, 2013			March 31, 2015		March 31, 2014			March 31, 2013
	Benefit Obligations:
	Discount rate	3.7	%		4.54	%		4.25	%		3.8	%	4.3	%		3.8	%
	Rate of compensation increase	3.4	%		3.41	%		3.42	%		n/a		n/a			n/a
	Net Periodic Benefit Cost:
	Discount rate	4.54	%		4.25	%		4.83	%		4.3	%	3.8	%		4.4	%
	Rate of compensation increase	3.41	%		3.42	%		3.4	%		n/a		n/a			n/a
	Expected return on plan assets	5.3	%		5.48	%		6	%		n/a		n/a			n/a
Schedule of Allocation of Plan Assets	The following table presents the Company’s target investment allocations for the year ended March 31, 2015 and actual investment allocations at March 31, 2015 and 2014.
		Plan Assets
		2015								2014
		Investment		Target			Actual			Actual
		Policy (1)		Allocation (2)			Allocation			Allocation
	Equity securities	20 - 30%		29	%		28	%		30	%
	Debt securities (including cash and cash equivalents)	55 - 80%		67	%		67	%		67	%
	Other	0 - 10%		4	%		5	%		3	%
	-1	The investment policy allocation represents the guidelines of the Company's principal U.S. pension plans based on the changes in the plans funded status.
	-2	The target allocations represent the weighted average target allocations for the Company's principal U.S. pension plans.
Schedule of Fair Value of Pension Plan Assets	The fair values of the Company’s pension plan assets for both the U.S and non-U.S. plans at March 31, 2015 and 2014, by asset category are included in the table below (in millions). For additional information on the fair value hierarchy and the inputs used to measure fair value, see Note 13 Fair Value Measurements.
		As of March 31, 2015
		Quoted Prices in				Significant Other				Significant			Total
		Active  Market				Observable  Inputs				Unobservable
		(Level 1)				(Level 2)				Inputs (Level 3)
	Cash and cash equivalents	$	1.8			$	5.6			$	—		$	7.4
	Investment funds
	Fixed income funds (1)	—				355.5				—			355.5
	U.S. equity funds (2)	—				68.1				—			68.1
	International equity funds (2)	—				35.8				—			35.8
	Balanced funds (2)	—				10.1				—			10.1
	Alternative investment funds (3)	—				—				42.9			42.9
	Insurance contracts	—				—				23.4			23.4
	Total	$	1.8			$	475.1			$	66.3		$	543.2
		As of March 31, 2014
		Quoted Prices in				Significant Other				Significant			Total
		Active  Market				Observable  Inputs				Unobservable
		(Level 1)				(Level 2)				Inputs (Level 3)
	Cash and cash equivalents	$	5.8			$	3			$	—		$	8.8
	Investment funds
	Fixed income funds (1)	—				374.4				—			374.4
	U.S. equity funds (2)	—				74.4				—			74.4
	International equity funds (2)	—				39.8				—			39.8
	Balanced funds (2)	—				10.2				—			10.2
	Alternative investment funds (3)	—				—				53.6			53.6
	Insurance contracts	—				—				16.5			16.5
	Total	$	5.8			$	501.8			$	70.1		$	577.7
	-1	The Company's fixed income mutual and commingled funds primarily include investments in U.S. government securities and corporate bonds. The commingled funds also include an insignificant portion of investments in asset-backed securities or partnerships. The mutual and commingled funds are valued using quoted market prices of the underlying investments.
	-2	The Company's equity mutual and commingled funds primarily include investments in U.S. and international common stock. The balanced mutual and commingled funds invest in a combination of fixed income and equity securities. The mutual and commingled funds are valued using quoted market prices of the underlying securities.
	-3	The Company's alternative investments include venture capital and partnership investments. Alternative investments are valued using the net asset value, which reflects the plan's share of the fair value of the investments.
Summary of Changes in Fair Value, Level 3	The table below sets forth a summary of changes in the fair value of the Level 3 investments for the years ended March 31, 2015 and 2014 (in millions):
		Alternative				Insurance				Total
		Investments				Contracts
	Beginning balance, March 31, 2013	$	52			$	12.3			$	64.3
	Actual return on assets:
	Related to assets held at reporting date	2.4				4.2				6.6
	Related to assets sold during the period	0.1				—				0.1
	Purchases, sales, issuances and settlements	(0.9		)		—				(0.9		)
	Transfers in and/or out of Level 3	—				—				—
	Ending balance, March 31, 2014	53.6				16.5				70.1
	Actual return on assets:
	Related to assets held at reporting date	(1.6		)		6.9				5.3
	Related to assets sold during the period	2.3				—				2.3
	Purchases, sales, issuances and settlements	(11.4		)		—				(11.4		)
	Transfers in and/or out of Level 3	—				—				—
	Ending balance, March 31, 2015	$	42.9			$	23.4			$	66.3
Schedule of Expected Benefit Payments	Expected benefit payments to be paid in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter are as follows (in millions):
	Year Ending March 31:	Pension				Other
		Benefits				Postretirement
						Benefits
	2016	$	40			$	2.7
	2017	40.3				2.7
	2018	40.6				2.8
	2019	40.7				2.7
	2020	40.8				2.6
	2021-2025	204.6				10.8
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates	A one-percentage point change in assumed health care cost trend rates would have the following effect (in millions):
		One Percentage Point Increase											One Percentage Point Decrease
		Year Ended March 31,											Year Ended March 31,
		2015				2014				2013			2015				2014			2013
	Increase (decrease) in total of service and interest cost components	$	0.1			$	0.1			$	0.1		$	(0.1	)		$	(0.1	)	$	(0.1	)
	Increase (decrease) in postretirement benefit obligation	2.9				2.4				2.7			(2.5		)		(2.1		)	(2.3		)

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Components of the Provision (Benefit) For Income Taxes	The components of the provision (benefit) for income taxes are as follows (in millions):
		Year ended March 31,
		2015			2014			2013
	Current:
	United States	$	17.2		$	0.8		$	0.1
	Non-United States	15.6			14.6			16.8
	State and local	4.7			1.6			0.5
	Total current	37.5			17			17.4
	Deferred:
	United States	(8.2		)	(8.6		)	6
	Non-United States	(10.5		)	(16.4		)	(7.0		)
	State and local	(2.0		)	(2.0		)	(1.0		)
	Total deferred	(20.7		)	(27.0		)	(2.0		)
	Provision (benefit) for income taxes	$	16.8		$	(10.0	)	$	15.4
U.S. Statutory Income Tax Rate Reconciliation	The provision (benefit) for income taxes differs from the United States statutory income tax rate due to the following items (in millions):
		Year ended March 31,
		2015			2014			2013
	Provision for income taxes at U.S. federal statutory income tax rate	$	37.9		$	5.2		$	21.9
	State and local income taxes, net of federal benefit	2.6			(1.1		)	2.5
	Net effects of foreign rate differential	(3.3		)	(3.6		)	(5.3		)
	Net effects of foreign related operations	8.9			5.7			(4.2		)
	Net effect to deferred taxes for changes in tax rates	0.2			0.6			(0.1		)
	Unrecognized tax benefits, net of federal benefit	(0.5		)	(4.7		)	0.2
	Domestic production activities deduction	(2.3		)	—			—
	Change in valuation allowance	(27.4		)	(11.5		)	—
	Other	0.7			(0.6		)	0.4
	Provision (benefit) for income taxes	$	16.8		$	(10.0	)	$	15.4
Components of Income (Loss) Before Income Taxes	The provision (benefit) for income taxes was calculated based upon the following components of income (loss) before income taxes (in millions):
		Year ended March 31,
		2015			2014			2013
	United States	$	89.9		$	(25.9	)	$	26
	Non-United States	18.7			40.9			36.7
	Income before income taxes	$	108.6		$	15		$	62.7
Schedule of Deferred Income Taxes	Deferred income taxes consist of the tax effects of the following temporary differences (in millions):
		March 31, 2015			March 31, 2014
	Deferred tax assets:
	Compensation and retirement benefits	$	86.9		$	76.5
	US federal and state tax net operating loss carryforwards	27.8			63.1
	Foreign tax credit carryforwards	26.5			46.8
	Foreign net operating loss carryforwards	17.1			17.2
	Other	25.3			7.4
	Total deferred tax assets before valuation allowance	183.6			211
	Valuation allowance	(25.0		)	(54.4		)
	Total deferred tax assets	158.6			156.6
	Deferred tax liabilities:
	Property, plant and equipment	47.8			45.6
	Inventories	30.8			31.8
	Intangible assets and goodwill	218.5			222.7
	Cancellation of indebtedness	58.8			74.5
	Total deferred tax liabilities	355.9			374.6
	Net deferred tax liabilities	$	197.3		$	218
Reconciliation of Gross Unrecognized Tax Benefits	The following table represents a reconciliation of the beginning and ending amount of the gross unrecognized tax benefits, excluding interest and penalties, for the fiscal years ended March 31, 2015 and March 31, 2014 (in millions):
		Year Ended March 31,
		2015			2014
	Balance at beginning of period	$	20.9		$	24
	Additions based on tax positions related to the current year	3.2			2.5
	Additions for tax positions of prior years	—			—
	Reductions for tax positions of prior years	—			—
	Settlements	—			(0.8		)
	Reductions due to lapse of applicable statute of limitations	(1.7		)	(4.7		)
	Cumulative translation adjustment	(0.7		)	(0.1		)
	Balance at end of period	$	21.7		$	20.9

Business_Segment_Information_T

Business Segment Information (Tables)	12 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Schedule of Business Segment Information	Business Segment Information:
	(in Millions)
			Year Ended
			March 31, 2015				March 31, 2014				March 31, 2013
	Net sales by product
	Process & Motion Control:
	Original equipment manufacturers/ end-users		$	642.1			$	621.1			$	570.8
	Aftermarket		588.1				617.1				633.7
	Total Process & Motion Control		$	1,230.20			$	1,238.20			$	1,204.50
	Water Management:
	Water safety, quality, flow control and conservation		517.1				465.6				430.1
	Water infrastructure		302.9				330.5				308.9
	Total Water Management		820				796.1				739
	Consolidated net sales		$	2,050.20			$	2,034.30			$	1,943.50
	Income (loss) from operations
	Process & Motion Control		$	219.6			$	237.7			$	219.7
	Water Management		79				72.2				67.9
	Corporate		(94.9		)		(37.5		)		(44.7		)
	Consolidated		$	203.7			$	272.4			$	242.9
	Non-operating expense:
	Interest expense, net		$	(87.9	)		$	(109.1	)		$	(153.3	)
	Loss on the extinguishment of debt		—				(133.2		)		(24.0		)
	Other expense, net		(7.2		)		(15.1		)		(2.9		)
	Income from continuing operations before income taxes		108.6				15				62.7
	Provision (benefit) provision for income taxes		16.8				(10.0		)		15.4
	Net income from continuing operations		$	91.8			$	25			$	47.3
	(Loss) income from discontinued operations, net of tax		(8.0		)		4.6				2.8
	Net income		83.8				29.6				50.1
	Non-controlling interest loss		—				(0.6		)		—
	Net income attributable to Rexnord		$	83.8			$	30.2			$	50.1
	Depreciation and Amortization
	Process & Motion Control		$	74.1			$	69.7			$	69.8
	Water Management		38.1				37.2				41.1
	Consolidated		$	112.2			$	106.9			$	110.9
	Capital Expenditures
	Process & Motion Control		$	37.7			$	39.4			$	39.6
	Water Management		11.1				12.8				20.5
	Consolidated		$	48.8			$	52.2			$	60.1
			March 31, 2015				March 31, 2014				March 31, 2013
	Total Assets
	Process & Motion Control		$	2,412.80			$	2,251.70			$	2,426.20
	Water Management		981.4				1,039.00				1,012.50
	Corporate		18.3				92.8				35.1
	Consolidated		$	3,412.50			$	3,383.50			$	3,473.80
Summary of Net Sales and Long-Lived Assets	Net sales to third parties and long-lived assets by geographic region are as follows (in millions):
		Net Sales												Long-lived Assets
		Year Ended March 31, 2015				Year Ended March 31, 2014				Year Ended March 31, 2013				March 31, 2015		March 31, 2014		March 31, 2013
	United States	$	1,380.00			$	1,337.20			$	1,283.90			$	279.4	$	284.6	$	257.5
	Europe	374				409.1				379.5				92.1		98.6		93.1
	Rest of World	296.2				288				280.1				46.1		40.5		43.5
		$	2,050.20			$	2,034.30			$	1,943.50			$	417.6	$	423.7	$	394.1

Quarterly_Results_of_Operation1

Quarterly Results of Operations (Tables)	12 Months Ended
	Mar. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information
		Fiscal 2015
		First Quarter			Second Quarter			Third Quarter			Fourth Quarter			Total
	Net sales	$	503.6		$	531		$	497.1		$	518.5		$	2,050.20
	Gross profit	178.2			197			181.5			189.5			746.2
	Net income from continuing operations	11.6			37.8			6.7			35.7			91.8
	Income (loss) from discontinued operations, net of tax	0.4			(0.7		)	(4.5		)	(3.2		)	(8.0		)
	Net income	12			37.1			2.2			32.5			83.8
	Non-controlling interest (loss) income	(0.1		)	(0.1		)	—			0.2			—
	Net income attributable to Rexnord	12.1			37.2			2.2			32.3			83.8
	Net income per share from continuing operations:
	Basic	$	0.11		$	0.37		$	0.07		$	0.35		$	0.9
	Diluted	$	0.11		$	0.36		$	0.06		$	0.34		$	0.88
	Income (loss) per share from discontinued operations:
	Basic	$	—		$	(0.01	)	$	(0.04	)	$	(0.03	)	$	(0.08	)
	Diluted	$	—		$	(0.01	)	$	(0.04	)	$	(0.03	)	$	(0.08	)
	Net income per share attributable to Rexnord:
	Basic	$	0.12		$	0.37		$	0.02		$	0.32		$	0.82
	Diluted	$	0.12		$	0.36		$	0.02		$	0.31		$	0.8
		Fiscal 2014
		First Quarter			Second Quarter			Third Quarter			Fourth Quarter			Total
	Net sales	$	494		$	501.4		$	478.1		$	560.8		$	2,034.30
	Gross profit	178.1			189			178.9			207.4			753.4
	Net income (loss) from continuing operations	11.6			(53.6		)	27.4			39.6			25
	Income (loss) from discontinued operations, net of tax	2			1.1			1.2			0.3			4.6
	Net income (loss)	13.6			(52.5		)	28.6			39.9			29.6
	Non-controlling interest loss	(0.2		)	(0.2		)	(0.1		)	(0.1		)	(0.6		)
	Net income (loss) attributable to Rexnord	13.8			(52.3		)	28.7			40			30.2
	Net income (loss) per share from continuing operations:
	Basic	$	0.12		$	(0.55	)	$	0.28		$	0.4		$	0.25
	Diluted	$	0.12		$	(0.55	)	$	0.27		$	0.38		$	0.25
	Net income per share from discontinued operations:
	Basic	$	0.02		$	0.01		$	0.01		$	—		$	0.05
	Diluted	$	0.02		$	0.01		$	0.01		$	—		$	0.05
	Net income (loss) per share attributable to Rexnord:
	Basic	$	0.14		$	(0.54	)	$	0.29		$	0.4		$	0.31
	Diluted	$	0.14		$	(0.54	)	$	0.28		$	0.39		$	0.3

Significant_Accounting_Policie3

Significant Accounting Policies - Narrative (Details) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
	Rate	Rate	Rate
Property, Plant and Equipment [Line Items]
Value of returned goods as percentage of net sales (or less)	1.00%	1.00%	1.00%
Anti-dilutive shares excluded from computation for diluted net income (loss) per share	1,268,623	1,278,316	2,924,547
Allowance for doubtful accounts	$16.80	$6.40
Largest customer percentage of consolidated net sales	8.90%	7.80%	7.40%
Largest customer accounts receivable balance	10.2	9.8
Percentage of LIFO inventory	61.00%	61.00%
Write-down of inventories	5.2	3.8	4.9
Deferred financing costs	9.9	12.1
Accumulated amortization	6.8	4.7
Foreign currency translation gains (losses)	-76.5	7.8
Unrealized gains (losses) on interest rate derivatives	-12.6	-1.7
Unrecognized actuarial gains (losses) and unrecognized prior services costs	-41.1	-29.9
Currency translation gains (losses)	-1.5	-3.9	-6.8
Advertising costs	10.4	9.6	10
Minimum | Customer Relationships
Property, Plant and Equipment [Line Items]
Estimated useful life	1 year
Minimum | Patents
Property, Plant and Equipment [Line Items]
Estimated useful life	2 years
Minimum | Tradenames
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Minimum | Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life	10 years
Minimum | Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life	5 years
Minimum | Hardware and software
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life	3 years
Maximum | Customer Relationships
Property, Plant and Equipment [Line Items]
Estimated useful life	20 years
Maximum | Patents
Property, Plant and Equipment [Line Items]
Estimated useful life	15 years
Maximum | Tradenames
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years
Maximum | Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life	30 years
Maximum | Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life	10 years
Maximum | Hardware and software
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life	5 years
VAG [Member]
Property, Plant and Equipment [Line Items]
Reserve for all outstanding receivables	$9.10

Significant_Accounting_Policie4

Significant Accounting Policies - Product Warranty (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$8	$7.70	$7.70
Acquired obligations	0	0.2	0
Charged to operations	1.8	3.9	3.6
Claims settled	-3	-3.8	-3.6
Balance at end of period	$6.80	$8	$7.70

Significant_Accounting_Policie5

Significant Accounting Policies - Accumulated Other Comprehensive Loss (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance				($23.80)				($38.70)	($23.80)	($38.70)	($11.30)
Other comprehensive (loss) income before reclassifications									-109.3	15.9	-26.5
Amounts reclassified from accumulated other comprehensive loss									2.9	-1	-0.9
Other comprehensive (loss) income, net of tax									-106.4	14.9	-27.4
Balance	-130.2				-23.8				-130.2	-23.8	-38.7
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Selling, general and administrative expenses									-415.1	-419.1	-398.4
Actuarial loss on pension and postretirement benefit obligations									59.4	2.7	5.5
(Benefit) provision for income taxes									16.8	-10	15.4
Total, net of income taxes	32.5	2.2	37.1	12	39.9	28.6	-52.5	13.6	83.8	29.6	50.1
Interest Rate Derivatives
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance				-1.7				0	-1.7	0	0
Other comprehensive (loss) income before reclassifications									-10.9	-1.7	0
Amounts reclassified from accumulated other comprehensive loss									0	0	0
Other comprehensive (loss) income, net of tax									-10.9	-1.7	0
Balance	-12.6				-1.7				-12.6	-1.7	0
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance				7.8				0.7	7.8	0.7	15
Other comprehensive (loss) income before reclassifications									-84.3	7.1	-14.3
Amounts reclassified from accumulated other comprehensive loss									0	0	0
Other comprehensive (loss) income, net of tax									-84.3	7.1	-14.3
Balance	-76.5				7.8				-76.5	7.8	0.7
Pension and Postretirement Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance				-29.9				-39.4	-29.9	-39.4	-26.3
Other comprehensive (loss) income before reclassifications									-14.1	10.5	-12.2
Amounts reclassified from accumulated other comprehensive loss									2.9	-1	-0.9
Other comprehensive (loss) income, net of tax									-11.2	9.5	-13.1
Balance	-41.1				-29.9				-41.1	-29.9	-39.4
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
(Benefit) provision for income taxes									-1.9	0.7	0.5
Total, net of income taxes									2.9	-1	-0.9
Pension and Postretirement Plans | Amortization of prior service credit
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Selling, general and administrative expenses									-1.7	-1.7	-1.4
Pension and Postretirement Plans | Lump Sum Settlement
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Actuarial loss on pension and postretirement benefit obligations									$6.50	$0	$0

Significant_Accounting_Policie6

Significant Accounting Policies - Research and Development (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Accounting Policies [Abstract]
Research and development costs	$12.80	$13	$13.70
Engineering costs	26	28.4	24.3
Total	$38.80	$41.40	$38

Acquisitions_Details

Acquisitions (Details)

12 Months Ended

0 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

0 Months Ended

0 Months Ended

3 Months Ended

In Millions, unless otherwise specified

Mar. 31, 2015

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2012

Mar. 31, 2015

Jan. 12, 2015

Oct. 30, 2014

Oct. 30, 2014

Oct. 30, 2014

Apr. 15, 2014

Mar. 31, 2015

Dec. 16, 2013

Mar. 31, 2015

Aug. 30, 2013

Aug. 21, 2013

Apr. 26, 2013

Mar. 31, 2014

Dec. 13, 2012

Dec. 13, 2012

Dec. 29, 2012

Mar. 31, 2014

USD ($)

USD ($)

USD ($)

Rate

Acquisitions 2015

Euroflex Transmissions

Tollok S.p.A.

Tollok S.p.A.

Tollok S.p.A.

Green Turtle

2014 Acquisitions

Precision Gear Holdings

Precision Gear Holdings

L.W. Gemmell

Micro Precision

Klamflex

Water Management

Cline

Cline

VAG

Co-venturer [Member]

Rate

USD ($)

USD ($)

USD ($)

EUR (€)

EUR (€)

USD ($)

USD ($)

USD ($)

subsidiary

USD ($)

USD ($)

USD ($)

Rate

USD ($)

USD ($)

USD ($)

Water Management

installment

employee

Business Acquisition [Line Items]

Total cash purchase price

$77.10

$27.70

$77.10

$8.20

$22.20

$4.50

$19.60

$1.40

Number of operating subsidiaries

2

Maximum purchase price, net of cash acquired

40.9

Purchase price, net of cash acquired

138.2

112

21

33.4

Purchase price, amount of installment payments

4

Purchase price, number of installment payments

2

Contingent consideration, not to exceed

3

Contingent consideration, term for payments

2 years

2 years

Acquisition - goodwill

1,202.30

1,150.70

1,118.40

74.7

26.7

12.2

Acquisition - other intangible assets

67.2

23.3

9.6

Acquisition - other net assets

3.8

25.3

Entity Number of Employees

6

Purchase price adjustments - increase (decrease) in goodwill

1.8

1.1

1.8

Purchase price adjustments - increase (decrease) in intangibles

-1.8

Acquisition - goodwill, tax deductible amount

24.6

Acquisition, property - plant and equipment

36.7

Non-controlling interest, percentage owned by parent

51.00%

Non-controlling interest percentage

49.00%

20.00%

49.00%

Acquisition - intangibles, including goodwill

$21.80

Discontinued_Operations_Narrat

Discontinued Operations - Narrative (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Business Divestiture [Line Items]
Gain (loss) from discontinued operations	($3.20)	($4.50)	($0.70)	$0.40	$0.30	$1.20	$1.10	$2	($8)	$4.60	$2.80
Gain (loss) from discontinued operations per share, basic and diluted (in dollars per share)											$0.03
Mill Products business
Business Divestiture [Line Items]
Discontinued operations, proceeds from sale	9.2
Provision for loss (gain) on disposal	9.7
Impairment of property, plant and equipment	3.8								3.8
Impairment of goodwill	4.1
Other exit related costs	1.8
Trade working capital	5.8								5.8
Discontinued operations, net income (loss) from operations									-8	4.6	7.6
Mill Products business | Other current assets
Business Divestiture [Line Items]
Long-lived assets held for sale	2.6				17.8				2.6	17.8
Non-core engineered chain business
Business Divestiture [Line Items]
Discontinued operations, proceeds from sale											2.5
Discontinued operations, pretax gain (loss) on disposal											-0.5
Discontinued operations, net income (loss) from operations											($4.30)

Discontinued_Operations_Result

Discontinued Operations - Results of Discontinued Operations (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Net (loss) income per share from discontinued operations:
Basic (in dollars per share)	($0.03)	($0.04)	($0.01)	$0	$0	$0.01	$0.01	$0.02	($0.08)	$0.05	$0.03
Diluted (in dollars per share)	($0.03)	($0.04)	($0.01)	$0	$0	$0.01	$0.01	$0.02	($0.08)	$0.05	$0.03
Mill Products business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales									$34.10	$47.70	$61.60
(Loss) income from operations before income taxes									-10.9	7.2	12.5
(Benefit) provision for income taxes									-2.9	2.6	4.9
Net (loss) income									($8)	$4.60	$7.60
Net (loss) income per share from discontinued operations:
Basic (in dollars per share)									($0.08)	$0.05	$0.08
Diluted (in dollars per share)									($0.08)	$0.05	$0.08

Restructuring_and_Other_Simila2

Restructuring and Other Similar Costs - By Operating Segment (Details) (USD $)	12 Months Ended			48 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring and other similar costs	$12.90	$8.40	$8.60	$29.90
Severance costs
Restructuring Cost and Reserve [Line Items]
Restructuring and other similar costs	10.9	6.1	6.8	23.8
Lease termination and other costs
Restructuring Cost and Reserve [Line Items]
Restructuring and other similar costs	2	2.3	1.8	6.1
Process & Motion Control
Restructuring Cost and Reserve [Line Items]
Restructuring and other similar costs	8.8	4.9	6.4	20.1
Process & Motion Control | Severance costs
Restructuring Cost and Reserve [Line Items]
Restructuring and other similar costs	7.6	3.3	5.3	16.2
Process & Motion Control | Lease termination and other costs
Restructuring Cost and Reserve [Line Items]
Restructuring and other similar costs	1.2	1.6	1.1	3.9
Water Management
Restructuring Cost and Reserve [Line Items]
Restructuring and other similar costs	4.1	2.7	2.2	9
Water Management | Severance costs
Restructuring Cost and Reserve [Line Items]
Restructuring and other similar costs	3.3	2	1.5	6.8
Water Management | Lease termination and other costs
Restructuring Cost and Reserve [Line Items]
Restructuring and other similar costs	0.8	0.7	0.7	2.2
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring and other similar costs	0	0.8	0	0.8
Corporate | Severance costs
Restructuring Cost and Reserve [Line Items]
Restructuring and other similar costs	0	0.8	0	0.8
Corporate | Lease termination and other costs
Restructuring Cost and Reserve [Line Items]
Restructuring and other similar costs	$0	$0	$0	$0

Restructuring_and_Other_Simila3

Restructuring and Other Similar Costs - Restructuring Reserve Rollforward (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Restructuring Reserve [Roll Forward]
Accrued Restructuring Costs, Beginning of Period	$3.80	$3.80
Charges	12.9	8.4	8.6
Cash payments	-8.9	-8.4
Non-cash charges	-0.8
Accrued Restructuring Costs, End of Period	7	3.8	3.8
Severance Costs
Restructuring Reserve [Roll Forward]
Accrued Restructuring Costs, Beginning of Period	3.4	3.7
Charges	10.9	6.1
Cash payments	-7.6	-6.4
Non-cash charges	0
Accrued Restructuring Costs, End of Period	6.7	3.4
Lease Termination and Other Costs
Restructuring Reserve [Roll Forward]
Accrued Restructuring Costs, Beginning of Period	0.4	0.1
Charges	2	2.3
Cash payments	-1.3	-2
Non-cash charges	-0.8
Accrued Restructuring Costs, End of Period	$0.30	$0.40

Recovery_Under_Continued_Dumpi1

Recovery Under Continued Dumping and Sudsidy Offset Act ("CDSOA") (Details) (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Component of Other Income, Nonoperating [Line Items]
Income distributed from CBP	($7,200,000)	($15,100,000)	($2,900,000)
Recovery under CDSOA
Component of Other Income, Nonoperating [Line Items]
Income distributed from CBP	$0	$0	$16,600,000

Inventories_By_Category_Detail

Inventories - By Category (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014
In Millions, unless otherwise specified
Inventory Disclosure [Abstract]
Finished goods	$146	$148.40
Work in progress	69.6	72.5
Purchased components	85.2	75.8
Raw materials	61.1	61.1
Inventories at First-in, First-Out (FIFO) cost	361.9	357.8
Adjustment to state inventories at Last-in, First-Out (LIFO) cost	5.8	1.9
Inventories, net	$367.70	$359.70

Property_Plant_and_Equipment_D

Property, Plant and Equipment (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014
In Millions, unless otherwise specified
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$726.80	$724.40
Less accumulated depreciation	-309.2	-301.3
Property, plant and equipment, net	417.6	423.1
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	33.5	32.1
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	217.7	215.6
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	388.2	390.7
Hardware and software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	61.5	62.5
Construction in-progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$25.90	$23.50

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets - Schedule of Changes (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Goodwill [Roll Forward]
Net carrying amount, beginning of period	$1,150.70	$1,118.40
Acquisitions	74.7	24.9
Purchase price allocation adjustments	1.8	1.1
Amortization	0	0
Currency translation adjustment and other	-24.9	6.3
Net carrying amount, end of period	1,202.30	1,150.70	1,118.40
Indefinite-lived Intangible Assets [Roll Forward]
Net carrying amount, beginning of period	338.4	332
Acquisitions	0	3.9
Purchase price allocation adjustments	-3.1	0
Amortization	0	0
Currency translation adjustment and other	-7.2	2.5
Net carrying amount, end of period	328.1	338.4	332
Finite-lived Intangible Assets [Roll Forward]
Amortization	-55.1	-50.8	-51.1
Intangibles (Excluding Goodwill) [Roll Forward]
Net carrying amount, beginning of period	592.6	613.5
Acquisitions	67.2	25.1
Purchase price allocation adjustments	-1.8	0
Amortization	-55.1	-50.8	-51.1
Currency translation adjustment and other	-15.2	4.8
Net carrying amount, end of period	587.7	592.6	613.5
Mill Products business
Goodwill [Roll Forward]
Net carrying amount, end of period	4.1
Trade-Names
Finite-lived Intangible Assets [Roll Forward]
Net carrying amount, beginning of period	1.9	0
Acquisitions	6.8	2
Purchase price allocation adjustments	1.3	0
Amortization	-1.2	-0.1
Currency translation adjustment and other	-0.1	0
Net carrying amount, end of period	8.7	1.9
Intangibles (Excluding Goodwill) [Roll Forward]
Amortization	-1.2	-0.1
Customer Relationships
Finite-lived Intangible Assets [Roll Forward]
Net carrying amount, beginning of period	241.4	267.7
Acquisitions	58.9	19.2
Purchase price allocation adjustments	0	0
Amortization	-50.4	-47.7
Currency translation adjustment and other	-7.8	2.2
Net carrying amount, end of period	242.1	241.4
Intangibles (Excluding Goodwill) [Roll Forward]
Amortization	-50.4	-47.7
Patents
Finite-lived Intangible Assets [Roll Forward]
Net carrying amount, beginning of period	10.9	13.8
Acquisitions	1.5	0
Purchase price allocation adjustments	0	0
Amortization	-3.5	-3
Currency translation adjustment and other	-0.1	0.1
Net carrying amount, end of period	8.8	10.9
Intangibles (Excluding Goodwill) [Roll Forward]
Amortization	-3.5	-3
Process & Motion Control
Goodwill [Roll Forward]
Net carrying amount, beginning of period	904	877.1
Acquisitions	54.7	21.9
Purchase price allocation adjustments	1.8	1.1
Amortization	0	0
Currency translation adjustment and other	-10.6	3.9
Net carrying amount, end of period	949.9	904
Indefinite-lived Intangible Assets [Roll Forward]
Net carrying amount, beginning of period	197.6	193.9
Acquisitions	0	2.7
Purchase price allocation adjustments	-3.1	0
Amortization	0	0
Currency translation adjustment and other	-1.6	1
Net carrying amount, end of period	192.9	197.6
Finite-lived Intangible Assets [Roll Forward]
Amortization	-33.2	-30.6
Intangibles (Excluding Goodwill) [Roll Forward]
Net carrying amount, beginning of period	297.6	303.7
Acquisitions	56.8	23
Purchase price allocation adjustments	-1.8
Amortization	-33.2	-30.6
Currency translation adjustment and other	-3.7	1.5
Net carrying amount, end of period	315.7	297.6
Process & Motion Control | Trade-Names
Finite-lived Intangible Assets [Roll Forward]
Net carrying amount, beginning of period	1.9	0
Acquisitions	5.2	2
Purchase price allocation adjustments	1.3	0
Amortization	-1	-0.1
Currency translation adjustment and other	-0.1	0
Net carrying amount, end of period	7.3	1.9
Intangibles (Excluding Goodwill) [Roll Forward]
Amortization	-1	-0.1
Process & Motion Control | Customer Relationships
Finite-lived Intangible Assets [Roll Forward]
Net carrying amount, beginning of period	94.4	104.9
Acquisitions	51.6	18.3
Purchase price allocation adjustments	0	0
Amortization	-31	-29.3
Currency translation adjustment and other	-2	0.5
Net carrying amount, end of period	113	94.4
Intangibles (Excluding Goodwill) [Roll Forward]
Amortization	-31	-29.3
Process & Motion Control | Patents
Finite-lived Intangible Assets [Roll Forward]
Net carrying amount, beginning of period	3.7	4.9
Acquisitions	0	0
Purchase price allocation adjustments	0	0
Amortization	-1.2	-1.2
Currency translation adjustment and other	0	0
Net carrying amount, end of period	2.5	3.7
Intangibles (Excluding Goodwill) [Roll Forward]
Amortization	-1.2	-1.2
Water Management
Goodwill [Roll Forward]
Net carrying amount, beginning of period	246.7	241.3
Acquisitions	20	3
Amortization	0	0
Currency translation adjustment and other	-14.3	2.4
Net carrying amount, end of period	252.4	246.7
Indefinite-lived Intangible Assets [Roll Forward]
Net carrying amount, beginning of period	140.8	138.1
Acquisitions	0	1.2
Amortization	0	0
Currency translation adjustment and other	-5.6	1.5
Net carrying amount, end of period	135.2	140.8
Finite-lived Intangible Assets [Roll Forward]
Amortization	-21.9	-20.2
Intangibles (Excluding Goodwill) [Roll Forward]
Net carrying amount, beginning of period	295	309.8
Acquisitions	10.4	2.1
Amortization	-21.9	-20.2
Currency translation adjustment and other	-11.5	3.3
Net carrying amount, end of period	272	295
Water Management | Trade-Names
Finite-lived Intangible Assets [Roll Forward]
Net carrying amount, beginning of period	0	0
Acquisitions	1.6	0
Amortization	-0.2	0
Currency translation adjustment and other	0	0
Net carrying amount, end of period	1.4	0
Intangibles (Excluding Goodwill) [Roll Forward]
Amortization	-0.2	0
Water Management | Customer Relationships
Finite-lived Intangible Assets [Roll Forward]
Net carrying amount, beginning of period	147	162.8
Acquisitions	7.3	0.9
Amortization	-19.4	-18.4
Currency translation adjustment and other	-5.8	1.7
Net carrying amount, end of period	129.1	147
Intangibles (Excluding Goodwill) [Roll Forward]
Amortization	-19.4	-18.4
Water Management | Patents
Finite-lived Intangible Assets [Roll Forward]
Net carrying amount, beginning of period	7.2	8.9
Acquisitions	1.5	0
Amortization	-2.3	-1.8
Currency translation adjustment and other	-0.1	0.1
Net carrying amount, end of period	6.3	7.2
Intangibles (Excluding Goodwill) [Roll Forward]
Amortization	($2.30)	($1.80)

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets - Intangible Asset Schedule (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Finite-Lived Intangible Assets [Abstract]
Accumulated Amortization	($425.90)	($370.80)
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying amount of indefinite-lived intangible assets	328.1	338.4	332
Gross carrying amount	1,013.60	963.4
Net carrying amount	587.7	592.6	613.5
Patents
Finite-Lived Intangible Assets [Abstract]
Weighted Average Useful Life	10 years	10 years
Gross Carrying Amount	40.1	38.7
Accumulated Amortization	-31.3	-27.8
Net Carrying Amount	8.8	10.9
Customer relationships (including distribution network)
Finite-Lived Intangible Assets [Abstract]
Weighted Average Useful Life	13 years	12 years
Gross Carrying Amount	635.4	584.3
Accumulated Amortization	-393.3	-342.9
Net Carrying Amount	242.1	241.4
Tradenames
Finite-Lived Intangible Assets [Abstract]
Weighted Average Useful Life	8 years	7 years
Gross Carrying Amount	10	2
Accumulated Amortization	-1.3	-0.1
Net Carrying Amount	8.7	1.9
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying amount of indefinite-lived intangible assets	$328.10	$338.40

Goodwill_and_Intangible_Assets4

Goodwill and Intangible Assets - Narrative (Details) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets		$55,100,000	$50,800,000	$51,100,000
Future amortization expense
Expected amortization expense, 2016		57,000,000
Expected amortization expense, 2017		37,900,000
Expected amortization expense, 2018		26,700,000
Expected amortization expense, 2019		26,500,000
Expected amortization expense, 2020		26,300,000
Goodwill and intangible asset impairment	0
Cumulative goodwill impairment charges		$323,400,000	$319,300,000

Other_Current_Liabilities_Deta

Other Current Liabilities (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014
In Millions, unless otherwise specified
Components of Other Current Liabilities [Line Items]
Other current liabilities	$127.30	$112.20
Customer advances
Components of Other Current Liabilities [Line Items]
Other current liabilities	7	8.1
Sales rebates
Components of Other Current Liabilities [Line Items]
Other current liabilities	25.4	22.7
Commissions
Components of Other Current Liabilities [Line Items]
Other current liabilities	3.9	7.9
Restructuring and other similar charges
Components of Other Current Liabilities [Line Items]
Other current liabilities	7	3.8
Product warranty
Components of Other Current Liabilities [Line Items]
Other current liabilities	6.8	8
Risk management
Components of Other Current Liabilities [Line Items]
Other current liabilities	9.4	9.1
Legal and environmental
Components of Other Current Liabilities [Line Items]
Other current liabilities	3.8	4.5
Deferred income taxes
Components of Other Current Liabilities [Line Items]
Other current liabilities	12.9	10.9
Taxes, other than income taxes
Components of Other Current Liabilities [Line Items]
Other current liabilities	8	9.5
Income taxes payable
Components of Other Current Liabilities [Line Items]
Other current liabilities	17.9	11.2
Interest payable
Components of Other Current Liabilities [Line Items]
Other current liabilities	5.5	0
Other
Components of Other Current Liabilities [Line Items]
Other current liabilities	$19.70	$16.50

LongTerm_Debt_Summary_of_Debt_

Long-Term Debt - Summary of Debt (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Debt Instrument [Line Items]
Long-term debt, net of unamortized original discount	$1,950,500,000	$1,972,000,000
Less current maturities	24,300,000	29,000,000
Long-term debt	1,926,200,000	1,943,000,000
Long-term debt, gross	1,965,900,000
Credit Facility | Term loans
Debt Instrument [Line Items]
Long-term debt, net of unamortized original discount	1,905,400,000	1,921,900,000
Unamortized original issue discount	15,400,000	18,300,000
Senior Notes | 8.875% Senior Notes, due 2016
Debt Instrument [Line Items]
Long-term debt, net of unamortized original discount	1,300,000	1,300,000
Other | Other
Debt Instrument [Line Items]
Long-term debt, net of unamortized original discount	43,800,000	48,800,000
Other | New Market Tax Credit
Debt Instrument [Line Items]
Long-term debt, gross	$37,400,000	$37,400,000	$37,400,000

LongTerm_Debt_Future_Debt_Matu

Long-Term Debt - Future Debt Maturities (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014
Maturities of Long-term Debt [Abstract]
2016	$24,300,000
2017	21,500,000
2018	19,700,000
2019	19,700,000
2020	19,500,000
Thereafter	1,861,200,000
Long-term debt, gross	1,965,900,000
Credit Facility | Term loans
Maturities of Long-term Debt [Abstract]
Unamortized original issue discount	$15,400,000	$18,300,000

LongTerm_Debt_Narrative_Detail

Long-Term Debt - Narrative (Details) (USD $)	12 Months Ended			3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Jun. 29, 2013	Sep. 28, 2013	Mar. 31, 2012
Debt Instrument [Line Items]
Loss on extinguishment of debt	$0	$133,200,000	$24,000,000
Long-term debt, gross	1,965,900,000
Outstanding principal	1,950,500,000	1,972,000,000
Proceeds from borrowings of long-term debt	100,000	1,935,100,000	15,400,000
Interest paid	84,100,000	151,100,000	149,400,000
Term loans | Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity					2,215,000,000
Unamortized original issue discount	15,400,000	18,300,000
Outstanding principal	1,905,400,000	1,921,900,000
Term loans | Credit Facility | Senior Secured Leverage Ratio (Numerator)
Debt Instrument [Line Items]
Covenant terms, positive ratio	7.75
Term loans | Term Loan Facility
Debt Instrument [Line Items]
Maximum borrowing capacity					1,950,000,000
Long-term debt, gross	1,905,400,000
LIBOR floor	1.00%
Step-down covenant terms, positive ratio	3.25
Principal payments prior to maturity	102,400,000
Periodic payment, principal	4,900,000
Term loans | Term Loan Facility | Eurocurrency Borrowings
Debt Instrument [Line Items]
Basis spread on variable rate	3.00%
Term loans | Term Loan Facility | ABR Borrowings
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
Interest rate based on Federal Funds effective rate	0.50%
Interest rate based on LIBOR	1.00%
Term loans | Term Loan Facility | April 2013 Incremental Assumption Agreement
Debt Instrument [Line Items]
Repayments of debt				150,000,000
Loss on extinguishment of debt				4,000,000
Retirement of debt, premium				800,000
Write-off of deferred costs				3,200,000
Term loans | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity					265,000,000
Long-term debt, gross	0	0
Average interest rate	4.00%
Step-up interest rate	-0.25%
Unused capacity, commitment fee percentage	0.50%
Outstanding letters of credit	24,000,000	29,100,000
Term loans | Revolving Credit Facility | Eurocurrency Borrowings
Debt Instrument [Line Items]
Step-down covenant terms, positive ratio	1.5
Step-down interest rate	4.00%
Covenant terms, company's ratio	3.85
Term loans | Revolving Credit Facility | ABR Borrowings
Debt Instrument [Line Items]
Step-down interest rate	3.00%
8.5% Senior Notes, due 2018 | Term Loan Facility
Debt Instrument [Line Items]
Repayments of debt					786,200,000
Loss on extinguishment of debt					129,200,000
Retirement of debt, premium					109,900,000
Third party transaction costs					5,300,000
Write-off of deferred costs					14,000,000
8.5% Senior Notes, due 2018 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate					8.50%
8.875% Senior Notes, due 2016 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate	8.88%
Outstanding principal	1,300,000	1,300,000
11.75% Senior Subordinated Notes, due 2016 | Senior Subordinated Notes
Debt Instrument [Line Items]
Stated interest rate		11.75%	11.75%
Loss on extinguishment of debt			21,100,000
Retirement of debt, premium			17,600,000
Long-term debt, gross			300,000,000
Retirement of debt, cost			325,000,000
Payment of accrued interest			7,400,000
Retirement of debt, deferred financing costs			3,500,000
New Market Tax Credit- Phase 2 | Other
Debt Instrument [Line Items]
Proceeds from borrowings of long-term debt			4,300,000
New Market Tax Credit- Phase 1 | Other
Debt Instrument [Line Items]
Proceeds from borrowings of long-term debt						5,500,000
New Market Tax Credit | Other
Debt Instrument [Line Items]
Long-term debt, gross	37,400,000	37,400,000	37,400,000
Payments to acquire loans receivable			27,600,000
Loan receivable, terms			30 years
Loan receivable, stated percentage			2.00%
Forgiveness of debt, possible non-operating gain			9,800,000
Loans receivables		27,600,000	27,600,000
Debt issuance costs		700,000
Other | Other
Debt Instrument [Line Items]
Outstanding principal	43,800,000	48,800,000
Accounts Receivable Securitization Program | Other
Debt Instrument [Line Items]
Maximum borrowing capacity						100,000,000
Interest rate based on LIBOR						2.25%
Unused capacity, commitment fee percentage						0.50%
Line of credit facility, expiration period						5 years
Potential availability for an increase in borrowings						75,000,000
Remaining borrowing capacity	$100,000,000
North America [Member] | Manufacturing Facility [Member]
Debt Instrument [Line Items]
Number of Plants			2

Derivative_Financial_Instrumen2

Derivative Financial Instruments - Fair Value of Derivative Instruments (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014
In Millions, unless otherwise specified
Designated as hedging instruments | Interest rate swaps | Other liabilities
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	$17.70	$2.70
Designated as hedging instruments | Interest rate caps | Other assets
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	3	0
Not designated as hedging instrument | Foreign currency forward contracts | Other current assets
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	$0.40	$0.10

Derivative_Financial_Instrumen3

Derivative Financial Instruments - Amount of Losses and Gains on Derivative Instruments (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss recognized in accumulated other comprehensive loss on derivatives	($12.60)	($1.70)
Foreign currency forward contracts | Other income (expense), net
Derivative Instruments, Gain (Loss) [Line Items]
Amount recognized in other expense, net	0.5	0.4	0.5
Designated as hedging instruments | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss recognized in accumulated other comprehensive loss on derivatives	9.2	1.7
Designated as hedging instruments | Interest rate caps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss recognized in accumulated other comprehensive loss on derivatives	$1.70	$0

Derivative_Financial_Instrumen4

Derivative Financial Instruments - Narrative (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
		derivative
Derivatives, Fair Value [Line Items]
Effectiveness of hedge	73.00%
Estimated reclassification of accumulated other comprehensive gain (loss)	($5.20)
Interest rate swaps
Derivatives, Fair Value [Line Items]
Number of interest rate derivatives held		3
Derivative, notional amount		650
Weighted average fixed interest rate		2.55%
Interest rate swaps | London Interbank Offered Rate (LIBOR)
Derivatives, Fair Value [Line Items]
LIBOR floor		1.00%
Interest rate caps
Derivatives, Fair Value [Line Items]
Number of interest rate derivatives held	2
Derivative liability, notional amount	750
Derivative, cap interest rate	3.00%
Derivative premium	$5.80
Applicable margin	3.00%
Maximum | Interest rate caps
Derivatives, Fair Value [Line Items]
Weighted average interest rate, maximum	2.79%

Fair_Value_Measurements_Assets

Fair Value Measurements - Assets and Liabilities Recognized at Fair Value on a Recurring Basis (Details) (Fair Value, Measurements, Recurring, USD $)	Mar. 31, 2015	Mar. 31, 2014
In Millions, unless otherwise specified
Assets:
Total assets at fair value	$3.40	$0.10
Total liabilities at fair value	17.7	2.7
Level 1
Assets:
Total assets at fair value	0	0
Total liabilities at fair value	0	0
Level 2
Assets:
Total assets at fair value	3.4	0.1
Total liabilities at fair value	17.7	2.7
Level 3
Assets:
Total assets at fair value	0	0
Total liabilities at fair value	0	0
Interest rate caps
Assets:
Assets	3
Interest rate caps | Level 1
Assets:
Assets	0
Interest rate caps | Level 2
Assets:
Assets	3
Interest rate caps | Level 3
Assets:
Assets	0
Foreign currency forward contracts
Assets:
Assets	0.4	0.1
Foreign currency forward contracts | Level 1
Assets:
Assets	0	0
Foreign currency forward contracts | Level 2
Assets:
Assets	0.4	0.1
Foreign currency forward contracts | Level 3
Assets:
Assets	0	0
Interest rate swaps
Assets:
Liabilities	17.7	2.7
Interest rate swaps | Level 1
Assets:
Liabilities	0	0
Interest rate swaps | Level 2
Assets:
Liabilities	17.7	2.7
Interest rate swaps | Level 3
Assets:
Liabilities	$0	$0

Fair_Value_Measurements_Narrat

Fair Value Measurements - Narrative (Details) (USD $)	3 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2015	Mar. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Fair value of long-term debt	$1,970.60	$1,970.60	$1,995.10
Mill Products business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of long-lived assets	3.8	3.8
Mill Products business | Other current assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Long-lived assets held for sale	$2.60	$2.60	$17.80

Leases_Details

Leases (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Leases [Abstract]
Rent expense	$19.40	$17	$16
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2016	14.8
2017	11.5
2018	9.5
2019	7.8
2020	6.9
Thereafter	4.4
Future minimum rental payments	$54.90

StockBased_Compensation_Fair_V

Stock-Based Compensation - Fair Value Options Granted (Details) (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
	Rate	Rate	Rate
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Expected option term (in years)	7 years 1 month 6 days	7 years 6 months	7 years 6 months
Expected volatility factor	26.00%	35.00%	34.00%
Weighted-average risk free interest rate	2.10%	1.57%	1.71%
Expected dividend rate	$0	$0	$0

StockBased_Compensation_Activi

Stock-Based Compensation - Activity (Details) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of period (shares)	8,652,834	9,450,197	10,874,371
Granted (shares)	1,268,124	978,849	2,626,157
Exercised (shares)	-743,807	-1,154,011	-3,746,740
Canceled/Forfeited (shares)	-588,633	-622,201	-303,591
Outstanding at end of period (shares)	8,588,518	8,652,834	9,450,197
Exercisable at end of period (shares)	4,798,457	5,225,236	5,879,052
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding at beginning of period (in dollars per share)		$10.79	$9.85	$5.27
Granted (in dollars per share)	$28.30	$19.82	$20.56
Exercised (in dollars per share)	$5.85	$5.91	$3.77
Canceled/Forfeited (in dollars per share)	$21.65	$19.91	$13.58
Outstanding at end of period (in dollars per share)	$13.06	$10.79	$9.85
Exercisable at end of period (in dollars per share)	$5.67	$5.46	$5.30
Total intrinsic value of options exercised	$16.70	$18.70	$56.10
Weighted average remaining contractual life of options outstanding	5 years 0 months	5 years 6 months	6 years 1 month
Aggregate intrinsic value of options outstanding	119.1
Weighted average remaining contractual life of options exercisable	2 years 7 months	3 years 8 months	4 years 7 months
Aggregate intrinsic value of options exercisable	$100.90

StockBased_Compensation_NonVes

Stock-Based Compensation - Non-Vested Options (Details) (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Shares [Abstract]
Non-vested options beginning of period (shares)	3,427,598
Granted (shares)	1,268,124	978,849	2,626,157
Vested (shares)	-318,774
Canceled/Forfeited (shares)	-588,633
Non-vested options end of period (shares)	3,788,315	3,427,598
Weighted Average Grant Date Fair Value [Abstract]
Non-vested options at beginning of period (in dollars per share)	$7.62
Granted (in dollars per share)	$9.21	$8.06	$8.22
Vested (in dollars per share)	$3.99
Canceled/Forfeited (in dollars per share)	$8.43
Non-vested options at end of period (in dollars per share)	$8.33	$7.62

StockBased_Compensation_Narrat

Stock-Based Compensation - Narrative (Details) (USD $)	1 Months Ended	12 Months Ended				8 Months Ended	12 Months Ended	40 Months Ended
	Feb. 28, 2015	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2007	Mar. 31, 2015	Mar. 31, 2012	Jul. 31, 2014
								Rate
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period					5 years
Award maximum term		10 years
Stock-based compensation expense		$6,400,000	$7,000,000	$7,100,000
Tax benefit on stock-based compensation		2,200,000	2,500,000	2,500,000
Excess tax benefit related to stock options exercised		5,800,000	5,800,000	18,100,000
Unrecognized compensation cost		17,300,000				17,300,000
Unrecognized compensation cost, weighted-average period of recognition		3 years 2 months 12 days
Stock repurchase program, authorized amount	200,000,000
Expected dividends		0	0	0
Weighted-average grant date fair value (in dollars per share)		$9.21	$8.06	$8.22
Fair value of options vested		$1,300,000	$1,800,000	$2,200,000
2006 Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized to be granted					11,239,290
2012 Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized to be granted							8,350,000
Vesting period						4 years
Award maximum term							10 years
Percentage vesting after three years								50.00%
Percentage vesting after five years								50.00%
2012 Incentive Plan | 50% vest after three years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period								3 years
2012 Incentive Plan | 50% vest after five years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period								5 years
2012 Incentive Plan | Options granted to directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period						3 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		4 years
RSUs granted (in shares)		58,883
Weighted-average grant date fair value of RSUs granted (in dollars per share)		$29.08

Retirement_Benefits_Pension_an

Retirement Benefits - Pension and Other Postretirement Benefits (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Pension Benefits
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$1.40	$1.80	$1.90
Interest cost	30	30.1	31.6
Expected return on plan assets	-29.8	-30.5	-31.9
Amortization of prior service cost (credit)	0.2	0.2	0.6
Curtailment loss	0	0	0.2
Settlement loss	6.5	0	0
Recognition of actuarial losses (gains)	51.7	2.7	7.2
Net periodic benefit cost	60	4.3	9.6
Other Postretirement Benefits
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	0.1	0.1	0.1
Interest cost	1.3	1.2	1.5
Amortization of prior service cost (credit)	-1.9	-1.9	-2
Recognition of actuarial losses (gains)	1.2	0	-1.7
Net periodic benefit cost	$0.70	($0.60)	($2.10)

Retirement_Benefits_Status_of_

Retirement Benefits - Status of Plans (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Actuarial (losses) gains	$59.40	$2.70	$5.50
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at the beginning of the period	577.7
Plan assets at end of period	543.2	577.7
Net amount on Consolidated Balance Sheets consists of:
Current liabilities	-5	-5.8
Long-term liabilities	-203	-147.7
Pension Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of period	-700	-720.6
Service cost	-1.4	-1.8	-1.9
Interest cost	-30	-30.1	-31.6
Actuarial (losses) gains	-114.2	18.2
Plan amendments	0	0.2
Benefits paid	40.8	38.5
Plan participant contributions	-0.4	-0.4
Settlements	65	0
Translation adjustment	21.4	-4
Benefit obligation at end of period	-718.8	-700	-720.6
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at the beginning of the period	577.7	577.7
Actual return on plan assets	65	25.6
Contributions	12.5	12.8
Benefits paid	-40.8	-38.5
Settlements	-65	0
Translation adjustment	-6.2	0.1
Plan assets at end of period	543.2	577.7	577.7
Funded status of plans	-175.6	-122.3
Net amount on Consolidated Balance Sheets consists of:
Current liabilities	-2.3	-3
Long-term liabilities	-173.3	-119.3
Total net funded status	-175.6	-122.3
Defined Benefit Plan, Accumulated Benefit Obligation	-706.3	-687.2
Other Postretirement Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of period	-31.2	-33.6
Service cost	-0.1	-0.1	-0.1
Interest cost	-1.3	-1.2	-1.5
Actuarial (losses) gains	-2.1	0.4
Plan amendments	0	0
Benefits paid	3.2	4.1
Plan participant contributions	-0.9	-0.8
Settlements	0	0
Translation adjustment	0	0
Benefit obligation at end of period	-32.4	-31.2	-33.6
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at the beginning of the period	0	0
Actual return on plan assets	0	0
Contributions	3.2	4.1
Benefits paid	-3.2	-4.1
Settlements	0	0
Translation adjustment	0	0
Plan assets at end of period	0	0	0
Funded status of plans	-32.4	-31.2
Net amount on Consolidated Balance Sheets consists of:
Current liabilities	-2.7	-2.8
Long-term liabilities	-29.7	-28.4
Total net funded status	($32.40)	($31.20)

Retirement_Benefits_Accumulate

Retirement Benefits - Accumulated Other Comprehensive Income (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014
In Millions, unless otherwise specified
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service cost (credit)	($6.90)	($8.60)
Unrecognized actuarial loss	72.9	55.3
Accumulated other comprehensive loss (income), gross	66	46.7
Deferred income tax (benefit) provision	-24.9	-16.8
Accumulated other comprehensive loss (income), net	41.1	29.9
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service cost (credit)	0.2	0.5
Unrecognized actuarial loss	71.7	54.9
Accumulated other comprehensive loss (income), gross	71.9	55.4
Deferred income tax (benefit) provision	-27.4	-19.7
Accumulated other comprehensive loss (income), net	44.5	35.7
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service cost (credit)	-7.1	-9.1
Unrecognized actuarial loss	1.2	0.4
Accumulated other comprehensive loss (income), gross	-5.9	-8.7
Deferred income tax (benefit) provision	2.5	2.9
Accumulated other comprehensive loss (income), net	($3.40)	($5.80)

Retirement_Benefits_Significan

Retirement Benefits - Significant Assumptions (Details)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
	Rate	Rate	Rate
Pension Benefits
Benefit Obligations:
Discount rate	3.70%	4.54%	4.25%
Rate of compensation increase	3.40%	3.41%	3.42%
Net Periodic Benefit Cost:
Discount rate	4.54%	4.25%	4.83%
Rate of compensation increase	3.41%	3.42%	3.40%
Expected return on plan assets	5.30%	5.48%	6.00%
Other Postretirement Benefits
Benefit Obligations:
Discount rate	3.80%	4.30%	3.80%
Net Periodic Benefit Cost:
Discount rate	4.30%	3.80%	4.40%

Retirement_Benefits_Target_Inv

Retirement Benefits - Target Investment Allocations (Details)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
	Rate	Rate
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Investment policy, minimum allocation	20.00%
Investment policy, maximum allocation	30.00%
Target Allocation	29.00%
Actual Allocation	28.00%	30.00%
Debt securities (including cash and cash equivalents)
Defined Benefit Plan Disclosure [Line Items]
Investment policy, minimum allocation	55.00%
Investment policy, maximum allocation	80.00%
Target Allocation	67.00%
Actual Allocation	67.00%	67.00%
Other
Defined Benefit Plan Disclosure [Line Items]
Investment policy, minimum allocation	0.00%
Investment policy, maximum allocation	10.00%
Target Allocation	4.00%
Actual Allocation	5.00%	3.00%

Retirement_Benefits_Fair_Value

Retirement Benefits - Fair Value Measurements (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
In Millions, unless otherwise specified
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$543.20	$577.70
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1.8	5.8
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	475.1	501.8
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	66.3	70.1	64.3
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7.4	8.8
Cash and cash equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1.8	5.8
Cash and cash equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5.6	3
Cash and cash equivalents | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	355.5	374.4
Fixed income funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fixed income funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	355.5	374.4
Fixed income funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
US equity funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	68.1	74.4
US equity funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
US equity funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	68.1	74.4
US equity funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International equity funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	35.8	39.8
International equity funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International equity funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	35.8	39.8
International equity funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Balanced funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10.1	10.2
Balanced funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Balanced funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10.1	10.2
Balanced funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Alternative Investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	42.9	53.6
Alternative Investments | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Alternative Investments | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Alternative Investments | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	42.9	53.6	52
Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	23.4	16.5
Insurance contracts | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Insurance contracts | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Insurance contracts | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$23.40	$16.50	$12.30

Retirement_Benefits_Changes_in

Retirement Benefits - Changes in Fair Value of Level 3 Investments (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Actual return on assets:
Plan assets at end of period	$543.20	$577.70
Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets at the beginning of the period	70.1	64.3
Actual return on assets:
Related to assets held at reporting date	5.3	6.6
Related to assets sold during the period	2.3	0.1
Purchases, sales, issuances and settlements	-11.4	-0.9
Transfers in and/or out of Level 3	0	0
Plan assets at end of period	66.3	70.1
Alternative Investments
Actual return on assets:
Plan assets at end of period	42.9	53.6
Alternative Investments | Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets at the beginning of the period	53.6	52
Actual return on assets:
Related to assets held at reporting date	-1.6	2.4
Related to assets sold during the period	2.3	0.1
Purchases, sales, issuances and settlements	-11.4	-0.9
Transfers in and/or out of Level 3	0	0
Plan assets at end of period	42.9	53.6
Insurance Contracts
Actual return on assets:
Plan assets at end of period	23.4	16.5
Insurance Contracts | Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets at the beginning of the period	16.5	12.3
Actual return on assets:
Related to assets held at reporting date	6.9	4.2
Related to assets sold during the period	0	0
Purchases, sales, issuances and settlements	0	0
Transfers in and/or out of Level 3	0	0
Plan assets at end of period	$23.40	$16.50

Retirement_Benefits_Expected_F

Retirement Benefits - Expected Future Benefit Payments (Details) (USD $)	Mar. 31, 2015
In Millions, unless otherwise specified
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2016	$40
2017	40.3
2018	40.6
2019	40.7
2020	40.8
2021-2025	204.6
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
2016	2.7
2017	2.7
2018	2.8
2019	2.7
2020	2.6
2021-2025	$10.80

Retirement_Benefits_Assumed_He

Retirement Benefits - Assumed Health Care Cost Trend (Details) (Other Postretirement Benefits, USD $)	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Other Postretirement Benefits
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
One percentage point increase - Increase (decrease) in total of service and interest cost components	$0.10	$0.10	$0.10
One percentage point decrease - increase (decrease) in total of service and interest cost components	-0.1	-0.1	-0.1
One percentage point increase - increase (decrease) in postretirement benefit obligation	2.9	2.4	2.7
One percentage point decrease - increase (decrease) in postretirement benefit obligation	($2.50)	($2.10)	($2.30)

Retirement_Benefits_Narrative_

Retirement Benefits - Narrative (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
	participant
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Actuarial gain (loss)	($59.40)	($2.70)	($5.50)
Inactive participants	4,500
Settlement paid	65
Non-cash actuarial gains (losses)	6.5
Gains (losses) associated with re-measurement of plan assets and liabilities	52.9
Plan assets	543.2	577.7
Multi-employer and government-sponsored plans - Expense recognized	0.2	0.3	0.3
Defined contribution savings plan - expense recognized	15.2	15.6	14.2
U.S qualified pension plan trusts
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contributions	7.9	7.8	8.4
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Actuarial gain (loss)	114.2	-18.2
Contributions	12.5	12.8
Projected benefit obligation	718.8	700	720.6
Plan assets	543.2	577.7	577.7
Under-funded status	-175.6	-122.3
Future amortization of prior service cost (credit)	0.1
Expected contributions in fiscal 2016	7.3
Pension plans that are not fully funded - projected benefit obligation	717.1	695.8
Pension plans that are not fully funded - accumulated benefit obligation	706.3	687.2
Pension plans that are not fully funded - fair value of plan assets	541.5	573.5
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Actuarial gain (loss)	2.1	-0.4
Contributions	3.2	4.1
Projected benefit obligation	32.4	31.2	33.6
Plan assets	0	0	0
Under-funded status	-32.4	-31.2
Future amortization of prior service cost (credit)	-2
Expected contributions in fiscal 2016	$2.70
Assumed health care cost trend rate	7.00%
Ultimate health care cost trend rate	5.00%

Income_Taxes_Income_Tax_Provis

Income Taxes - Income Tax Provision (Benefit) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Current:
United States	$17.20	$0.80	$0.10
Non-United States	15.6	14.6	16.8
State and local	4.7	1.6	0.5
Total current	37.5	17	17.4
Deferred:
United States	-8.2	-8.6	6
Non-United States	-10.5	-16.4	-7
State and local	-2	-2	-1
Total deferred	-20.7	-27	-2
Provision (benefit) for income taxes	$16.80	($10)	$15.40

Income_Taxes_US_Statutory_Inco

Income Taxes - U.S. Statutory Income Tax Rate Reconciliation (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Provision for income taxes at U.S. federal statutory income tax rate	$37.90	$5.20	$21.90
State and local income taxes, net of federal benefit	2.6	-1.1	2.5
Net effects of foreign rate differential	-3.3	-3.6	-5.3
Net effects of foreign related operations	8.9	5.7	-4.2
Net effect to deferred taxes for changes in tax rates	0.2	0.6	-0.1
Unrecognized tax benefits, net of federal benefit	-0.5	-4.7	0.2
Domestic production activities deduction	-2.3	0	0
Change in valuation allowance	-27.4	-11.5	0
Other	0.7	-0.6	0.4
Provision (benefit) for income taxes	$16.80	($10)	$15.40

Income_Taxes_Components_of_Inc

Income Taxes - Components of Income (Loss) Before Income Taxes (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]
United States	$89.90	($25.90)	$26
Non-United States	18.7	40.9	36.7
Income from continuing operations before income taxes	$108.60	$15	$62.70

Income_Taxes_Deferred_Income_T

Income Taxes - Deferred Income Tax Assets and Liabilities (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014
In Millions, unless otherwise specified
Deferred tax assets:
Compensation and retirement benefits	$86.90	$76.50
US federal and state tax net operating loss carryforwards	27.8	63.1
Foreign tax credit carryforwards	26.5	46.8
Foreign net operating loss carryforwards	17.1	17.2
Other	25.3	7.4
Total deferred tax assets before valuation allowance	183.6	211
Valuation allowance	-25	-54.4
Total deferred tax assets	158.6	156.6
Deferred tax liabilities:
Property, plant and equipment	47.8	45.6
Inventories	30.8	31.8
Intangible assets and goodwill	218.5	222.7
Cancellation of indebtedness	58.8	74.5
Total deferred tax liabilities	355.9	374.6
Net deferred tax liabilities	$197.30	$218

Income_Taxes_Gross_Unrecognize

Income Taxes - Gross Unrecognized Tax Benefits (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance at beginning of period	$20.90	$24
Additions based on tax positions related to the current year	3.2	2.5
Additions for tax positions of prior years	0	0
Reductions for tax positions of prior years	0	0
Settlements	0	-0.8
Reductions due to lapse of applicable statute of limitations	-1.7	-4.7
Cumulative translation adjustment	-0.7	-0.1
Balance at end of period	$21.70	$20.90

Income_Taxes_Narrative_Details

Income Taxes - Narrative (Details) (USD $)	12 Months Ended			3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Jun. 29, 2013	Sep. 28, 2013
Operating Loss Carryforwards [Line Items]
Foreign tax credit carryforward period	10 years
U.S. federal net operating loss carryforward period	20 years
Foreign net operating loss carryforward period	5 years
Valuation allowance for state NOL carryforwards	$520.50
Foreign NOL carryforwards	77.6
Valuation allowance for foreign NOL carryforward	5.8
Undistributed earnings of foreign subsidiaries	149
Undistributed earnings of foreign subsidiaries, potential related taxes	6.1
Net cash paid for income taxes	21.2	13.6	16.7
Liability for unrecognized tax benefits	26.6	23.6
Unrecognized tax benefits, income tax penalties and interest accrued	12.4	9.9
Unrecognized tax benefits, income tax penalties and interest expense (benefit)	0.7	-0.6	0.9
State tax authority
Operating Loss Carryforwards [Line Items]
State NOL carryforwards	18.3
Foreign tax authority | Ministry of Economic Affairs and Finance, Italy
Operating Loss Carryforwards [Line Items]
Income Tax Examination, Penalties and Interest Expense				0.7
Foreign tax authority | Federal Ministry of Finance, Germany
Operating Loss Carryforwards [Line Items]
Income Tax Examination, Penalties and Interest Expense					$0.40
Minimum
Operating Loss Carryforwards [Line Items]
State net operating loss carryforward period, minimum of range	5 years
Maximum
Operating Loss Carryforwards [Line Items]
State net operating loss carryforward period, minimum of range	20 years

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)	12 Months Ended				1 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2006	Feb. 28, 2014	Aug. 31, 2013
				agreement
Related Party Transaction [Line Items]
Management agreement, termination fee per agreement			$20,100,000
Number of stockholders' agreements				2
Offering expenses (excluding underwriters' discounts and commissions) paid by the Company on behalf of selling stockholders	500,000	1,400,000
Aggregate principal amount redeemed	1,965,900,000
Senior Subordinated Notes | 11.75% Senior Subordinated Notes, due 2016
Related Party Transaction [Line Items]
Aggregate principal amount redeemed			300,000,000
Stated interest rate		11.75%	11.75%
Early redemption premiums paid			17,600,000
Payment of accrued interest			7,400,000
Majority Shareholder
Related Party Transaction [Line Items]
Management agreement, term			12 years
Majority Shareholder | Contract termination
Related Party Transaction [Line Items]
Management fees paid to affiliate			15,000,000
Majority Shareholder | Unreimbursed expenses
Related Party Transaction [Line Items]
Management fees paid to affiliate			700,000
Board of Directors Chairman | Senior Subordinated Notes | 11.75% Senior Subordinated Notes, due 2016
Related Party Transaction [Line Items]
Related party debt redemption			2,600,000
Chief Executive Officer | Senior Subordinated Notes | 11.75% Senior Subordinated Notes, due 2016
Related Party Transaction [Line Items]
Related party debt redemption			300,000
Executive Vice President | Senior Subordinated Notes | 11.75% Senior Subordinated Notes, due 2016
Related Party Transaction [Line Items]
Related party debt redemption			300,000
Apollo Global Securities, LLC
Related Party Transaction [Line Items]
Related party, offering discounts and commissions					100,000
Related party, refinance arrangement fee						600,000
Related party, IPO customary discounts and commissions			1,400,000
Morgan Joseph TriArtisan LLC
Related Party Transaction [Line Items]
Related party, IPO customary discounts and commissions			$300,000

Commitments_and_Contingencies_

Commitments and Contingencies (Details) (USD $)	12 Months Ended		1 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2002	Mar. 31, 2015	Feb. 28, 2013	Nov. 30, 2002
	defendant	lawsuit
		claimant
Loss Contingencies [Line Items]
Indemnity obligations (in excess of)				$900
Available insurance coverage		248.1
Layer 1
Loss Contingencies [Line Items]
Available insurance coverage		172.1
Environmental Issue | Ellsworth Industrial Park Site
Loss Contingencies [Line Items]
Number of defendants (at least)	10
Percentage of indemnity obligations paid by seller	100.00%
Asbestos Issue | Stearns
Loss Contingencies [Line Items]
Percentage of indemnity obligations paid by seller	100.00%
Number of pending claims	700
Asbestos Issue | Prager
Loss Contingencies [Line Items]
Number of pending lawsuits	2
Percentage of costs paid by insurance providers	100.00%
Asbestos Issue | Falk
Loss Contingencies [Line Items]
Percentage of indemnity obligations paid by seller		100.00%
Number of pending claims		50
Asbestos Issue | Zurn
Loss Contingencies [Line Items]
Number of pending claims		21,000
Number of pending lawsuits		7,000
Timeframe of estimated claims disbursements		10 years
Estimate of potential liability		35
Amount expected to be paid by insurance providers		27
Receivable from insurance carriers		35
Damages from Product Defects | Zurn
Loss Contingencies [Line Items]
Claim settlement funding period			7 years
Settlement amount			20
Settlement, plaintiffs' attorneys' fees and expenses			$8.50

Common_Stock_Public_Offerings_

Common Stock Public Offerings (Details) (USD $)	0 Months Ended		12 Months Ended
In Millions, except Share data, unless otherwise specified	Feb. 05, 2014	Apr. 03, 2012	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Feb. 05, 2014	Apr. 03, 2012
Equity [Abstract]
Sale of common stock (in shares)	3,000,000	27,236,842
Offering price (in dollars per share)						$25.75	$18
Aggregate offering proceeds, net - common stock offering	$73.80
Aggregate offering proceeds, net - initial public offering		458.3	0	73.8	458.3
Offering costs		$28.20

Business_Segment_Information_D

Business Segment Information (Details) (USD $)	3 Months Ended								12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
									segment
Segment Reporting Information [Line Items]
Number of segments									2
Segment Reporting Information, Additional Information [Abstract]
Net sales	$518,500,000	$497,100,000	$531,000,000	$503,600,000	$560,800,000	$478,100,000	$501,400,000	$494,000,000	$2,050,200,000	$2,034,300,000	$1,943,500,000
Income (loss) from operations									203,700,000	272,400,000	242,900,000
Interest expense, net									-87,900,000	-109,100,000	-153,300,000
Loss on the extinguishment of debt									0	-133,200,000	-24,000,000
Other expense, net									-7,200,000	-15,100,000	-2,900,000
Income from continuing operations before income taxes									108,600,000	15,000,000	62,700,000
Provision (benefit) for income taxes									16,800,000	-10,000,000	15,400,000
Net income from continuing operations	35,700,000	6,700,000	37,800,000	11,600,000	39,600,000	27,400,000	-53,600,000	11,600,000	91,800,000	25,000,000	47,300,000
(Loss) gain from discontinued operations, net of tax	-3,200,000	-4,500,000	-700,000	400,000	300,000	1,200,000	1,100,000	2,000,000	-8,000,000	4,600,000	2,800,000
Net income	32,500,000	2,200,000	37,100,000	12,000,000	39,900,000	28,600,000	-52,500,000	13,600,000	83,800,000	29,600,000	50,100,000
Non-controlling interest loss	200,000	0	-100,000	-100,000	-100,000	-100,000	-200,000	-200,000	0	-600,000	0
Net income attributable to Rexnord	32,300,000	2,200,000	37,200,000	12,100,000	40,000,000	28,700,000	-52,300,000	13,800,000	83,800,000	30,200,000	50,100,000
Depreciation and Amortization									112,200,000	106,900,000	110,900,000
Capital Expenditures									48,800,000	52,200,000	60,100,000
Total Assets	3,412,500,000				3,383,500,000				3,412,500,000	3,383,500,000	3,473,800,000
Segments, Geographical Areas [Abstract]
Net Sales									2,050,200,000	2,034,300,000	1,943,500,000
Long-lived Assets	417,600,000				423,700,000				417,600,000	423,700,000	394,100,000
United States
Segments, Geographical Areas [Abstract]
Net Sales									1,380,000,000	1,337,200,000	1,283,900,000
Long-lived Assets	279,400,000				284,600,000				279,400,000	284,600,000	257,500,000
Europe
Segments, Geographical Areas [Abstract]
Net Sales									374,000,000	409,100,000	379,500,000
Long-lived Assets	92,100,000				98,600,000				92,100,000	98,600,000	93,100,000
Rest of World
Segments, Geographical Areas [Abstract]
Net Sales									296,200,000	288,000,000	280,100,000
Long-lived Assets	46,100,000				40,500,000				46,100,000	40,500,000	43,500,000
Process & Motion Control
Segment Reporting Information, Additional Information [Abstract]
Net sales									1,230,200,000	1,238,200,000	1,204,500,000
Income (loss) from operations									219,600,000	237,700,000	219,700,000
Depreciation and Amortization									74,100,000	69,700,000	69,800,000
Capital Expenditures									37,700,000	39,400,000	39,600,000
Total Assets	2,412,800,000				2,251,700,000				2,412,800,000	2,251,700,000	2,426,200,000
Process & Motion Control | Original equipment manufacturers/ end-users
Segment Reporting Information, Additional Information [Abstract]
Net sales									642,100,000	621,100,000	570,800,000
Process & Motion Control | Aftermarket
Segment Reporting Information, Additional Information [Abstract]
Net sales									588,100,000	617,100,000	633,700,000
Water Management
Segment Reporting Information, Additional Information [Abstract]
Net sales									820,000,000	796,100,000	739,000,000
Income (loss) from operations									79,000,000	72,200,000	67,900,000
Depreciation and Amortization									38,100,000	37,200,000	41,100,000
Capital Expenditures									11,100,000	12,800,000	20,500,000
Total Assets	981,400,000				1,039,000,000				981,400,000	1,039,000,000	1,012,500,000
Water Management | Water safety, quality, flow control and conservation
Segment Reporting Information, Additional Information [Abstract]
Net sales									517,100,000	465,600,000	430,100,000
Water Management | Water infrastructure
Segment Reporting Information, Additional Information [Abstract]
Net sales									302,900,000	330,500,000	308,900,000
Corporate
Segment Reporting Information, Additional Information [Abstract]
Income (loss) from operations									-94,900,000	-37,500,000	-44,700,000
Total Assets	$18,300,000				$92,800,000				$18,300,000	$92,800,000	$35,100,000

Quarterly_Results_of_Operation2

Quarterly Results of Operations (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Net sales	$518.50	$497.10	$531	$503.60	$560.80	$478.10	$501.40	$494	$2,050.20	$2,034.30	$1,943.50
Gross profit	189.5	181.5	197	178.2	207.4	178.9	189	178.1	746.2	753.4	716.6
Net income from continuing operations	35.7	6.7	37.8	11.6	39.6	27.4	-53.6	11.6	91.8	25	47.3
(Loss) gain from discontinued operations, net of tax	-3.2	-4.5	-0.7	0.4	0.3	1.2	1.1	2	-8	4.6	2.8
Net income	32.5	2.2	37.1	12	39.9	28.6	-52.5	13.6	83.8	29.6	50.1
Non-controlling interest (loss) income	0.2	0	-0.1	-0.1	-0.1	-0.1	-0.2	-0.2	0	-0.6	0
Net income attributable to Rexnord	$32.30	$2.20	$37.20	$12.10	$40	$28.70	($52.30)	$13.80	$83.80	$30.20	$50.10
Net income (loss) per share from continuing operations:
Basic (in dollars per share)	$0.35	$0.07	$0.37	$0.11	$0.40	$0.28	($0.55)	$0.12	$0.90	$0.25	$0.49
Diluted (in dollars per share)	$0.34	$0.06	$0.36	$0.11	$0.38	$0.27	($0.55)	$0.12	$0.88	$0.25	$0.47
Net income per share from discontinued operations:
Basic (in dollars per share)	($0.03)	($0.04)	($0.01)	$0	$0	$0.01	$0.01	$0.02	($0.08)	$0.05	$0.03
Diluted (in dollars per share)	($0.03)	($0.04)	($0.01)	$0	$0	$0.01	$0.01	$0.02	($0.08)	$0.05	$0.03
Net income (loss) per share attributable to Rexnord:
Basic (in dollars per share)	$0.32	$0.02	$0.37	$0.12	$0.40	$0.29	($0.54)	$0.14	$0.82	$0.31	$0.52
Diluted (in dollars per share)	$0.31	$0.02	$0.36	$0.12	$0.39	$0.28	($0.54)	$0.14	$0.80	$0.30	$0.50

Schedule_II_Valuation_and_Qual1

Schedule II - Valuation and Qualifying Accounts (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Valuation allowance for trade and notes receivable
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$6.40	$7.70	$6.20
Charged to Costs and Expenses	10.7	1	1.3
Acquired Obligations	0.6	0.2	1.4
Charged to Other Accounts	-0.4	-0.1	-0.7
Deductions	-0.5	-2.4	-0.5
Ending balance	16.8	6.4	7.7
Valuation allowance for excess and obsolete inventory
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	33.8	30.5	30.9
Charged to Costs and Expenses	5.2	3.8	4.9
Acquired Obligations	0.8	4.1	3.3
Charged to Other Accounts	-0.6	0.2	-4.2
Deductions	-3.5	-4.8	-4.4
Ending balance	35.7	33.8	30.5
Valuation allowance for income taxes
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	54.4	73.1	90.3
Charged to Costs and Expenses	2	3.9	3.9
Acquired Obligations	0	0	0
Charged to Other Accounts	0	0	0
Deductions	-31.4	-22.6	-21.1
Ending balance	$25	$54.40	$73.10