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Acquisitions (Narrative) (Details) - USD ($) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
May 29, 2018 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 2,833.5 | $ 2,833.5 | $ 2,740.8
3 Arts Entertainment |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Equity interests acquired | 51.00% |  |  |
Aggregate purchase price | $ 166.6 |  |  |
Percentage of cash consideration | 50.00% |  |  |
Period for issuance of equity interests after closing date | 1 year |  |  |
Period for weighted average closing price | 20 days |  |  |
Deferred compensation arrangements | $ 38.3 |  |  |
Contingency period |  | 5 years |  |
Noncontrolling interest, fair value | 15.8 |  |  |
Intangible assets | 47.0 |  |  |
Goodwill | 92.7 |  |  |
Business acquisition, transaction costs | $ 1.3 |  |  |
3 Arts Entertainment | Class B Non-Voting Common Shares |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Percentage at closing | 32.50% |  |  |
Percentage paid one-year from closing | 17.50% |  |  |
Customer relationships | 3 Arts Entertainment |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Weighted-average useful life |  | 12 years |  |
Noncontrolling Interest Holders | 3 Arts Entertainment |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Redeemable noncontrolling interest, ownership percentage held by noncontrolling interest holders | 49.00% |  |  |

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