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Financial Instruments (Details Textual 1) - USD ($) $ in Millions | Jun. 30, 2018 | Mar. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Non-current investments | $ 69.5 | $ 86.2
Bank Time Deposits [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Short-term Investments | 1,334.0 | 480.2
Non-current investments | 69.5 | 86.2
Commercial Paper [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Short-term Investments | $ 153.6 | $ 219.2

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