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Derivative Instruments - Freestanding Derivative Forward Contracts (Details) $ in Millions | 12 Months Ended
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Mar. 31, 2019 USD ($) contract | Mar. 31, 2018 USD ($) contract | Mar. 31, 2017 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Percentage of company sales denominated in Us dollars | 99.00% |  |
Foreign currency transaction gains (loss), before tax | $ 1.7 | $ 9.3 | $ 1.0
Number of foreign currency derivatives held | contract | 0 | 0 |
Foreign Exchange Forward |  |  |
Derivative [Line Items] |  |  |
Gain (loss) on foreign currency derivatives | $ 0.0 | $ 4.2 | $ (2.3)

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- Definition Aggregate impact of foreign currency derivatives on earnings for the period. Includes impact of foreign currency cash flow hedge ineffectiveness and the ineffectiveness of fair value hedging derivatives and full change in fair value of the foreign currency derivatives not designated as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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