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Related Party Transactions (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	May 20, 2019
Related Party Transaction [Line Items]
Investment in equity method investees	$ 48.6	$ 53.4	$ 20.6
Director
Related Party Transaction [Line Items]
Related party, ownership percentage of entity	100.00%
Related party transaction, amounts paid		0.1	0.0
Equity Method Investees
Related Party Transaction [Line Items]
Related party expenses incurred	$ 32.2	22.0	10.5
Loans receivable net of equity interest losses included in other assets, noncurrent	7.3	0.2
Atom Tickets | Equity Method Investees
Related Party Transaction [Line Items]
Investment in equity method investees		10.0	0.0
Class A Voting Common Shares | Subsequent Event | Chairman of the Board of Directors
Related Party Transaction [Line Items]
Percentage of common stock outstanding held by Mark H. Rachesky				19.00%
Class B Non-Voting Common Shares | Subsequent Event | Chairman of the Board of Directors
Related Party Transaction [Line Items]
Percentage of common stock outstanding held by Mark H. Rachesky				11.00%
Voting Agreement | Chairman of the Board of Directors
Related Party Transaction [Line Items]
Maximum out-of-pocket expenses reimbursable			1.6
Related party expenses incurred			0.5
Voting Agreement | Director
Related Party Transaction [Line Items]
Maximum out-of-pocket expenses reimbursable			1.6
Related party expenses incurred			1.5
Other | Director
Related Party Transaction [Line Items]
Related party expenses incurred	3.3	$ 5.6	$ 1.0
Maximum | Director
Related Party Transaction [Line Items]
Related party transaction, amounts paid	0.1
Other Non-Current Assets | Equity Method Investees
Related Party Transaction [Line Items]
Loans receivable net of equity interest losses included in other assets, noncurrent	$ 7.3

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