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Derivative Instruments, (Gain) Loss by Hedging Relationship, by Income Statement Location (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Derivative Instruments, (Gain) Loss [Line Items] |  |  |  |
Reclassified gains from foreign exchange contracts to net sales | [1] | $ 0.1 |  |
Non-Designated Derivative [Member] |  |  |  |
Derivative Instruments, (Gain) Loss [Line Items] |  |  |  |
Total gains (losses) |  | (0.2) | $ 1.8 | $ (0.1)
Commodity Derivatives [Member] | Other Comprehensive Income (Loss) [Member] | Designated [Member] |  |  |  |
Derivative Instruments, (Gain) Loss [Line Items] |  |  |  |
Total gains (losses) |  | 0.2 |  |
Commodity Derivatives [Member] | Cost of Sales [Member] | Non-Designated Derivative [Member] |  |  |  |
Derivative Instruments, (Gain) Loss [Line Items] |  |  |  |
Total gains (losses) |  | 0.4 | 0.5 | (0.7)
Foreign Exchange Contracts [Member] | Other Comprehensive Income (Loss) [Member] | Designated [Member] |  |  |  |
Derivative Instruments, (Gain) Loss [Line Items] |  |  |  |
Total gains (losses) |  | 0.1 |  |
Foreign Exchange Contracts [Member] | Net Sales [Member] | Non-Designated Derivative [Member] |  |  |  |
Derivative Instruments, (Gain) Loss [Line Items] |  |  |  |
Total gains (losses) |  | (0.1) | 0.0 | 0.0
Foreign Exchange Contracts [Member] | Other Income (Expense) - Net [Member] | Non-Designated Derivative [Member] |  |  |  |
Derivative Instruments, (Gain) Loss [Line Items] |  |  |  |
Total gains (losses) |  | $ (0.5) | $ 1.3 | $ 0.6
[1] | Amounts reclassified to net earnings. See Note 17 for additional information regarding derivative instruments.

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41638-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details
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