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Share-Based Compensation - Narrative (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Income tax expense benefit share based compensation | $ (15.1) | $ (17.8) | $ (16.7)
Share based compensation by share based award unrecognized compensation on stock options | 2.3 |  |
STARZ BUSINESS OF LIONS GATE ENTERTAINMENT CORP. |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Income tax expense benefit associated with share based compensation | 0.0 | 0.0 | (0.6)
Income tax expense benefit share based compensation | (5.9) | (6.2) | (6.7)
Share based compensation by share based award unrecognized compensation on stock options | 0.0 |  |
Two Thousand And Nineteen Lions Gate Plan |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Income tax expense benefit associated with share based compensation | 7.4 | 8.7 | 12.7
Share based compensation by share based award aggregate intrinsic value of stock options exercised during the period | 0.2 | 1.1 | 2.1
Restricted Stock And Restricted Share Units | STARZ BUSINESS OF LIONS GATE ENTERTAINMENT CORP. |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Income tax expense benefit share based compensation | 4.6 | 2.6 | 3.0
Other Share Based Compensation | Two Thousand And Nineteen Lions Gate Plan |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Share based compensation by share based award shares granted during the period value | $ 2.3 | $ 2.3 | $ 2.3
Share based compensation by share based award shares granted during the period shares | 0.2 | 0.3 | 0.1
Minimum | STARZ BUSINESS OF LIONS GATE ENTERTAINMENT CORP. |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Share based compensation by share based award vesting period | 1 year |  |
Share based compensation by share based expiration period | 7 years |  |
Minimum | Stock options | Two Thousand And Nineteen Lions Gate Plan |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Share based compensation by share based award period of service | 1 year |  |
Share based compensation by share based expiration period | 7 years |  |
Minimum | Restricted Stock And Restricted Share Units | Two Thousand And Nineteen Lions Gate Plan |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Share based compensation by share based award period of service | 1 year |  |
Minimum | Restricted Stock | STARZ BUSINESS OF LIONS GATE ENTERTAINMENT CORP. |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Share based compensation by share based award period of service | 1 year |  |
Maximum | STARZ BUSINESS OF LIONS GATE ENTERTAINMENT CORP. |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Share based compensation by share based award vesting period | 4 years |  |
Share based compensation by share based expiration period | 10 years |  |
Share based compensation by share based award aggregate intrinsic value of stock options exercised during the period | $ 0.1 | $ 0.1 | $ 0.2
Maximum | Stock options | Two Thousand And Nineteen Lions Gate Plan |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Share based compensation by share based award period of service | 5 years |  |
Share based compensation by share based expiration period | 10 years |  |
Maximum | Restricted Stock And Restricted Share Units | Two Thousand And Nineteen Lions Gate Plan |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Share based compensation by share based award period of service | 3 years |  |
Maximum | Restricted Stock | STARZ BUSINESS OF LIONS GATE ENTERTAINMENT CORP. |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Share based compensation by share based award period of service | 3 years |  |

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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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