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Financial Instruments (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Jul. 31, 2018 | Jun. 25, 2018 | May 23, 2018
Derivative [Line Items] |  |  |  |  |
Remaining maturity of forward foreign exchange contracts, maximum | 16 months |  |  |  |
Foreign currency cash flow hedge gain estimated to be reclassified into earnings during next 12 months | $ 0.7 |  |  |  |
Interest rate swap cash flow hedge loss estimated to be reclassified into earnings during next 12 months | (42.8) |  |  |  |
Interest Rate Swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | $ 1,700.0 | $ 1,700.0 | $ 300.0 | $ 200.0 | $ 1,000.0

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + 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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