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Investments (Summarized Balance Sheet) (Details) - USD ($) $ in Millions		Dec. 31, 2018	Mar. 31, 2018
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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