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Noncontrolling Interests (Narrative) (Details) - USD ($) $ in Millions |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 12, 2024 | Nov. 12, 2022 | May 29, 2018 | Nov. 12, 2015 | Feb. 28, 2023 | Jun. 30, 2022 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021 | Nov. 14, 2022
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase of noncontrolling interest |  |  |  |  |  |  | $ (55.1) | $ 0.0 | $ 0.0 |
Call period |  | 30 days |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  | $ 1.7 | $ 0.0 | $ 0.0 |
3 Arts Entertainment |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred compensation arrangements |  |  | $ 38.3 |  |  |  |  |  |  |
Contingency period |  |  |  |  |  |  | 5 years |  |  |
Forecast |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Call period | 30 days |  |  |  |  |  |  |  |  |
3 Arts Entertainment |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Put rights exercise period |  |  |  |  |  |  | 60 days |  |  |
Period after expiration of put rights that call rights begin |  |  |  |  |  |  | 30 days |  |  |
Call rights exercise period |  |  |  |  |  |  | 60 days |  |  |
Pilgrim Media Group |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  | $ 2.7 |  |  |  |
3 Arts Entertainment |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Initial fair value of redeemable noncontrolling interests |  |  | $ 15.8 |  |  |  |  |  |  |
Redeemable noncontrolling interest, ownership percentage held by noncontrolling interest holders |  |  | 49.00% |  |  |  |  |  |  |
Pilgrim Media Group |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |
Initial fair value of redeemable noncontrolling interests |  |  |  | $ 90.1 |  |  |  |  |  |
Redeemable noncontrolling interest, ownership percentage held by noncontrolling interest holders |  |  |  | 37.50% |  |  |  |  |  |
Portion of noncontrolling interest redeemable after first term, five years after November 12, 2015 |  | 25.00% |  |  |  |  |  |  |  | 25.00%
Settlement of exercised put option |  |  |  |  | $ 36.5 |  |  |  |  |
Purchase of noncontrolling interest |  |  |  |  | (55.1) |  |  |  |  |
Reduction in accumulated deficit |  |  |  |  | $ 18.6 |  |  |  |  |

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