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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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