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Investments (Summarized Balance Sheet) (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Mar. 31, 2019
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Schedule of Equity Method Investments [Line Items] |  |
Current assets | $ 126.6 | $ 189.8
Non-current assets | 66.1 | 55.7
Current liabilities | 142.6 | 167.8
Non-current liabilities | $ 44.6 | $ 46.7

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