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Restructuring and Other (Restructuring and Other) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2024
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other |  | $ 508.5 | $ 411.9 | $ 16.8 |
Total restructuring and other and other unusual charges not included in restructuring and other |  | 507.5 | 407.3 | 56.2 |
Development costs, written off |  | 12.8 |  |  |
Incremental compensation expense | $ 49.2 | 49.2 | 0.0 | 0.0 |
Insurance recoveries |  | 1.2 | 14.1 | 22.1 |
Minimum |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring initiative, expected future cash outlay | 80.0 | 80.0 |  |  | $ 80.0
Maximum |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring initiative, expected future cash outlay | $ 90.0 | 90.0 |  |  | 90.0
Severance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other |  | 46.6 | 22.2 | 4.6 |
COVID-19 related charges |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other |  | 0.0 | 0.1 | 1.1 |
Transaction and related costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other |  | 84.6 | 4.4 | 11.1 |
Content And Other Impairments |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other |  | 377.3 | 385.2 | 0.0 |
Operating lease, impairment loss |  |  | 5.8 |  |
Content And Other Impairments | Media Networks |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other |  | 364.5 | 379.3 |  | $ 743.8
Content And Other Impairments | Television Production |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Development costs, written off |  | 12.8 |  |  |
Transaction And Other Cost |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
COVID-19 related charges (benefit) |  | $ 16.6 |  |  |
Transaction And Other Cost | Consolidated Entity |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Ownership percentage, parent | 51.00% | 51.00% |  |  | 51.00%
Transaction And Other Cost | Media Networks |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Settlement of a legal matter |  |  | 11.0 |  |
Transaction And Other Cost, Migration Benefit |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other |  | $ 5.4 |  |  |
Cash | Severance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other |  | 37.2 | 18.0 | 4.6 |
Accelerated vesting on equity awards | Severance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and other |  | 9.4 | 4.2 | 0.0 |
Direct operating expense |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Programming and content charges |  | 0.0 | 7.0 | 36.9 |
COVID-19 related charges (benefit) |  | (1.0) | (11.6) | (3.6) |
Charges related to Russia's invasion of Ukraine included in direct operating expense |  | 0.0 | 0.0 | 5.9 |
Distribution and marketing expense |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
COVID-19 related charges (benefit) |  | $ 0.0 | $ 0.0 | $ 0.2 |

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