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Acquisitions (Narrative) (Details) - USD ($) $ in Millions |  |  | 6 Months Ended |
--- | --- | --- | --- | ---
May 29, 2018 | Oct. 11, 2017 | Sep. 30, 2018 | Mar. 31, 2018
Business Acquisition [Line Items] |  |  |  |
Period for weighted average closing price (number of consecutive trading days) | 20 days |  |  |
Goodwill |  |  | $ 2,833.5 | $ 2,740.8
Deferred compensation arrangements |  |  | $ 38.3 |
Redeemable noncontrolling interest | $ (15.8) |  |  |
Business combination, contingent consideration, contingency period |  |  | 5 years |
3 Arts Entertainment |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition, percentage of membership interest acquired | 51.00% |  |  |
Purchase price | $ 166.6 |  |  |
Percent of purchase price paid in cash at closing | 50.00% |  |  |
Acquisition related costs | $ 1.3 |  |  |
Goodwill | 92.7 |  |  |
Finite-lived intangible assets | $ 47.0 |  |  |
Period for issuance of equity interests after closing date | 1 year |  |  |
Good Universe |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 29.0 |  |
Purchase price, cash consideration |  | 20.4 |  |
Purchase price, cash consideration to be paid after one-year of the closing date |  | $ 1.4 |  |
Period for issuance of equity interests after closing date |  | 1 year |  |
Purchase price, loans assumed |  | $ 23.6 |  |
Repayments of corporate debt and production loans |  |  | $ 14.9 |
Class B Non-Voting Shares | 3 Arts Entertainment |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Percent of purchase price paid in Class B non-voting common shares at closing | 32.50% |  |  |
Percent of purchase prince to be paid in Class B non-voting common shares on the one-year anniversary of closing | 17.50% |  |  |
Class B Non-Voting Shares | Good Universe |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Purchase price, common shares to be issued, number of shares |  | 119,751 |  |
Customer relationships | 3 Arts Entertainment |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life |  |  | 12 years |
3 Arts Entertainment |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Redeemable noncontrolling interest, ownership percentage held by noncontrolling interest holders | 49.00% |  |  |

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