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Share-Based Compensation - Summary Of Share-Based Compensation Expense, By Expense Category (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |
Share-Based Compensation Expense: | $ 14.3 | $ 12.7 | $ 31.4 |  | $ 34.2 |  | $ 62.5 | $ 73.4 | $ 70.2
Starz Business of Lions Gate Entertainment Corp |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |
Share-Based Compensation Expense: |  |  | 13.7 | [1] | 20.3 | [1] | 24.6 | 25.7 | 28.0
Direct Operating Expenses | Starz Business of Lions Gate Entertainment Corp |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |
Share-Based Compensation Expense: |  |  | 2.1 |  | 2.3 |  | 2.7 | 1.6 | 1.2
Selling and Marketing Expense | Starz Business of Lions Gate Entertainment Corp |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |
Share-Based Compensation Expense: |  |  | 0.7 |  | 0.7 |  | 0.8 | 0.7 | 0.5
General and administrative expense |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |
Share-Based Compensation Expense: |  |  |  |  |  |  | 54.8 | 69.2 | 70.2
General and administrative expense | Starz Business of Lions Gate Entertainment Corp |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |
Share-Based Compensation Expense: |  |  | 10.6 |  | 16.4 |  | 19.7 | 23.4 | 26.3
Restructuring and other |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |
Share-Based Compensation Expense: |  |  | $ 0.3 |  | $ 0.9 |  | 7.7 | 4.2 | 0.0
Restructuring and other | Starz Business of Lions Gate Entertainment Corp |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |  |
Share-Based Compensation Expense: |  |  |  |  |  |  | $ 1.4 | $ 0.0 | $ 0.0
[1] | Included in net earnings (loss) from discontinued operations for the nine months ended December 31, 2024 was share-based compensation expense of $0.3 million (2023 — $1.4 million).

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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