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Financial Instruments (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Jul. 31, 2018 | Jun. 25, 2018 | May 23, 2018 | Mar. 31, 2018
Derivative [Line Items] |  |  |  |  |
Remaining maturity of forward foreign exchange contracts, maximum | 12 months |  |  |  |
Interest rate swap cash flow hedge loss estimated to be reclassified into earnings during next 12 months | $ 3.7 |  |  |  |
Interest Rate Swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | 1,700.0 | $ 300.0 | $ 200.0 | $ 1,000.0 | $ 0.0
Maximum |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Foreign currency cash flow hedge loss estimated to be reclassified into earnings during next 12 months | $ 0.1 |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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- Definition Maximum amount of time remaining before foreign currency exchange rate derivatives mature or expire, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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