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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 Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 35 -Paragraph 2 -SubTopic 740 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479176/718-740-35-2 + Details
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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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