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Goodwill and Intangible Assets (Goodwill) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Mar. 31, 2024 | Mar. 31, 2023
Goodwill [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | $ 1,289.5 | $ 2,764.5
Acquisition of eOne |  |  | 5.8 |
Impairment | $ (493.9) | $ (1,475.0) | (493.9) | (1,475.0)
Measurement period adjustments |  |  | (9.8) |
Balance, end of period |  |  | 811.2 | 1,289.5
Entertainment One Television and Film Business ("eOne") |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Measurement period adjustments |  |  | 9.8 |
Decrease to accounts receivable |  |  | 11.4 |
Decrease to other assets |  |  | 12.4 |
Increase to investment in film and television programs |  |  | 4.0 |
Decrease to content related payables |  |  | 1.9 |
Decrease to accrued liabilities |  |  | 3.8 |
Decrease to participation and residuals |  |  | 1.9 |
Decrease to deferred revenue |  |  | 2.4 |
Motion Picture |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | 393.7 | 393.7
Acquisition of eOne |  |  | 1.0 |
Impairment |  |  | 0.0 | 0.0
Measurement period adjustments |  |  | (3.9) |
Balance, end of period |  |  | 398.6 | 393.7
Television Production |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | 401.9 | 401.9
Acquisition of eOne |  |  | 4.8 |
Impairment |  |  | 0.0 | 0.0
Measurement period adjustments |  |  | (5.9) |
Balance, end of period |  |  | 412.6 | 401.9
Media Networks |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | 493.9 | 1,968.9
Acquisition of eOne |  |  | 0.0 |
Impairment |  |  | (493.9) | (1,475.0)
Measurement period adjustments |  |  | 0.0 |
Balance, end of period |  |  | 0.0 | 493.9
Accumulated goodwill impairment losses |  |  | $ 1,969.0 | $ 1,475.0

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