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Investments (Summarized Balance Sheet) (Details) - Other Equity Method Investments - USD ($) $ in Millions | Mar. 31, 2019 | Mar. 31, 2018
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Schedule of Equity Method Investments [Line Items] |  |
Current assets | $ 189.8 | $ 232.7
Non-current assets | 55.7 | 130.0
Current liabilities | 167.8 | 201.5
Non-current liabilities | $ 46.7 | $ 45.0

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