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Investments (Summarized Balance Sheet) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Mar. 31, 2018
Pop    
Schedule of Equity Method Investments [Line Items]    
Current assets $ 73.5 $ 48.2
Non-current assets 190.6 191.6
Current liabilities 46.5 37.2
Non-current liabilities [1] 716.5 654.9
Redeemable preferred stock [1] 692.7 638.4
Other    
Schedule of Equity Method Investments [Line Items]    
Current assets 181.4 232.7
Non-current assets 59.5 130.0
Current liabilities 149.9 201.5
Non-current liabilities $ 10.2 $ 45.0
[1] Non-current liabilities includes mandatorily redeemable preferred stock units.