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Investments (Summarized Balance Sheet) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Mar. 31, 2018
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Pop |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Current assets |  | $ 77.7 | $ 48.2
Non-current assets |  | 194.7 | 191.6
Current liabilities |  | 48.5 | 37.2
Non-current liabilities | [1] | 755.0 | 654.9
Redeemable preferred stock | [1] | 725.0 | 638.4
Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Current assets |  | 156.4 | 232.7
Non-current assets |  | 55.9 | 130.0
Current liabilities |  | 132.9 | 201.5
Non-current liabilities |  | $ 18.8 | $ 45.0
[1] | Non-current liabilities includes mandatorily redeemable preferred stock units.

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