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Consolidating Financial Information - Convertible Senior Subordinated Notes (Statement of Cash Flows) (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Consolidating Financial Information [Line Items] |  |  |
Net Cash Flows Provided By (Used In) Operating Activities | $ 389.2 | $ 558.6 | $ (19.0)
Investing Activities: |  |  |
Proceeds from the sale of equity method investee, net of transaction costs | 393.7 | 0.0 | 0.0
Investment in equity method investees | (53.4) | (20.6) | (16.8)
Distributions from equity method investee | 0.0 | 3.1 | 0.0
Business acquisitions, net of cash acquired of $18.7, $73.5, and $15.8 in 2018, 2017 and 2016, respectively (see Note 2) | (1.8) | (1,102.6) | (126.9)
Capital expenditures | (45.9) | (25.2) | (18.4)
Net Cash Flows Provided By (Used In) Investing Activities | 292.6 | (1,145.3) | (162.1)
Financing Activities: |  |  |
Debt - borrowings | 3,712.6 | 4,002.8 | 629.5
Debt - repayments | (4,335.7) | (2,766.9) | (444.5)
Production loans - borrowings | 319.7 | 296.0 | 572.6
Production loans - repayments | (332.8) | (632.6) | (483.1)
Repurchase of common shares | 0.0 | 0.0 | (73.2)
Dividends paid | 0.0 | (26.8) | (47.5)
Distributions to noncontrolling interest | (8.2) | (6.9) | 0.0
Exercise of stock options | 44.9 | 25.4 | 6.1
Tax withholding required on equity awards | (22.9) | (40.9) | (24.2)
Net Cash Flows Provided By (Used In) Financing Activities | (622.4) | 850.1 | 135.7
Net Change In Cash And Cash Equivalents | 59.4 | 263.4 | (45.4)
Foreign Exchange Effects on Cash | (3.2) | 0.8 | 0.4
Cash and Cash Equivalents - Beginning Of Period | 321.9 | 57.7 | 102.7
Cash and Cash Equivalents - End Of Period | 378.1 | 321.9 | 57.7
Convertible Senior Subordinated Notes |  |  |
Consolidating Financial Information [Line Items] |  |  |
Net Cash Flows Provided By (Used In) Operating Activities | 389.2 | 558.6 | (19.0)
Investing Activities: |  |  |
Proceeds from the sale of equity method investee, net of transaction costs | 393.7 |  | 0.0
Investment in equity method investees | (53.4) | (20.6) | (16.8)
Distributions from equity method investee |  | 3.1 |
Business acquisitions, net of cash acquired of $18.7, $73.5, and $15.8 in 2018, 2017 and 2016, respectively (see Note 2) | (1.8) | (1,102.6) | (126.9)
Capital expenditures | (45.9) | (25.2) | (18.4)
Net Cash Flows Provided By (Used In) Investing Activities | 292.6 | (1,145.3) | (162.1)
Financing Activities: |  |  |
Debt - borrowings | 3,712.6 | 4,002.8 | 629.5
Debt - repayments | (4,335.7) | (2,766.9) | (444.5)
Production loans - borrowings | 319.7 | 296.0 | 572.6
Production loans - repayments | (332.8) | (632.6) | (483.1)
Repurchase of common shares |  |  | (73.2)
Dividends paid |  | (26.8) | (47.5)
Distributions to noncontrolling interest | (8.2) | (6.9) |
Exercise of stock options | 44.9 | 25.4 | 6.1
Tax withholding required on equity awards | (22.9) | (40.9) | (24.2)
Net Cash Flows Provided By (Used In) Financing Activities | (622.4) | 850.1 | 135.7
Net Change In Cash And Cash Equivalents | 59.4 | 263.4 | (45.4)
Foreign Exchange Effects on Cash | (3.2) | 0.8 | 0.4
Cash and Cash Equivalents - Beginning Of Period | 321.9 | 57.7 | 102.7
Cash and Cash Equivalents - End Of Period | 378.1 | 321.9 | 57.7
Consolidating Adjustments | Convertible Senior Subordinated Notes |  |  |
Consolidating Financial Information [Line Items] |  |  |
Net Cash Flows Provided By (Used In) Operating Activities | 0.0 | 0.0 | 0.0
Investing Activities: |  |  |
Proceeds from the sale of equity method investee, net of transaction costs | 0.0 |  | 0.0
Investment in equity method investees | 0.0 | 0.0 | 0.0
Distributions from equity method investee |  | 0.0 |
Business acquisitions, net of cash acquired of $18.7, $73.5, and $15.8 in 2018, 2017 and 2016, respectively (see Note 2) | 0.0 | 0.0 | 0.0
Capital expenditures | 0.0 | 0.0 | 0.0
Net Cash Flows Provided By (Used In) Investing Activities | 0.0 | 0.0 | 0.0
Financing Activities: |  |  |
Debt - borrowings | 0.0 | 0.0 | 0.0
Debt - repayments | 0.0 | 0.0 | 0.0
Production loans - borrowings | 0.0 | 0.0 | 0.0
Production loans - repayments | 0.0 | 0.0 | 0.0
Repurchase of common shares |  |  | 0.0
Dividends paid |  | 0.0 | 0.0
Distributions to noncontrolling interest | 0.0 | 0.0 |
Exercise of stock options | 0.0 | 0.0 | 0.0
Tax withholding required on equity awards | 0.0 | 0.0 | 0.0
Net Cash Flows Provided By (Used In) Financing Activities | 0.0 | 0.0 | 0.0
Net Change In Cash And Cash Equivalents | 0.0 | 0.0 | 0.0
Foreign Exchange Effects on Cash | 0.0 | 0.0 | 0.0
Cash and Cash Equivalents - Beginning Of Period | 0.0 | 0.0 | 0.0
Cash and Cash Equivalents - End Of Period | 0.0 | 0.0 | 0.0
Reportable Legal Entities [Member] | Lions Gate Entertainment Corp. | Convertible Senior Subordinated Notes |  |  |
Consolidating Financial Information [Line Items] |  |  |
Net Cash Flows Provided By (Used In) Operating Activities | 2,554.0 | (2,121.9) | (49.1)
Investing Activities: |  |  |
Proceeds from the sale of equity method investee, net of transaction costs | 0.0 |  | 0.0
Investment in equity method investees | 0.0 | 0.0 | 0.0
Distributions from equity method investee |  | 0.0 |
Business acquisitions, net of cash acquired of $18.7, $73.5, and $15.8 in 2018, 2017 and 2016, respectively (see Note 2) | 0.0 | 0.0 | 0.0
Capital expenditures | 0.0 | 0.0 | 0.0
Net Cash Flows Provided By (Used In) Investing Activities | 0.0 | 0.0 | 0.0
Financing Activities: |  |  |
Debt - borrowings | 1,041.5 | 4,002.8 | 629.5
Debt - repayments | (3,630.5) | (1,824.1) | (444.5)
Production loans - borrowings | 0.0 | 0.0 | 0.0
Production loans - repayments | 0.0 | 0.0 | 0.0
Repurchase of common shares |  |  | (73.2)
Dividends paid |  | (26.8) | (47.5)
Distributions to noncontrolling interest | 0.0 | 0.0 |
Exercise of stock options | 44.9 | 25.4 | 6.1
Tax withholding required on equity awards | (22.9) | (40.9) | (24.2)
Net Cash Flows Provided By (Used In) Financing Activities | (2,567.0) | 2,136.4 | 46.2
Net Change In Cash And Cash Equivalents | (13.0) | 14.5 | (2.9)
Foreign Exchange Effects on Cash | 0.0 | 0.0 | 0.0
Cash and Cash Equivalents - Beginning Of Period | 15.1 | 0.6 | 3.5
Cash and Cash Equivalents - End Of Period | 2.1 | 15.1 | 0.6
Reportable Legal Entities [Member] | Lions Gate Entertainment Inc. | Convertible Senior Subordinated Notes |  |  |
Consolidating Financial Information [Line Items] |  |  |
Net Cash Flows Provided By (Used In) Operating Activities | 130.6 | 145.2 | 7.7
Investing Activities: |  |  |
Proceeds from the sale of equity method investee, net of transaction costs | 0.0 |  | 0.0
Investment in equity method investees | (31.9) | (4.2) | (8.6)
Distributions from equity method investee |  | 0.4 |
Business acquisitions, net of cash acquired of $18.7, $73.5, and $15.8 in 2018, 2017 and 2016, respectively (see Note 2) | 0.0 | 0.0 | 0.0
Capital expenditures | (11.6) | (8.9) | (18.3)
Net Cash Flows Provided By (Used In) Investing Activities | (43.5) | (12.7) | (26.9)
Financing Activities: |  |  |
Debt - borrowings | 0.0 | 0.0 | 0.0
Debt - repayments | 0.0 | 0.0 | 0.0
Production loans - borrowings | 0.0 | 0.0 | 0.0
Production loans - repayments | 0.0 | 0.0 | 0.0
Repurchase of common shares |  |  | 0.0
Dividends paid |  | 0.0 | 0.0
Distributions to noncontrolling interest | 0.0 | 0.0 |
Exercise of stock options | 0.0 | 0.0 | 0.0
Tax withholding required on equity awards | 0.0 | 0.0 | 0.0
Net Cash Flows Provided By (Used In) Financing Activities | 0.0 | 0.0 | 0.0
Net Change In Cash And Cash Equivalents | 87.1 | 132.5 | (19.2)
Foreign Exchange Effects on Cash | 0.0 | 0.0 | 0.0
Cash and Cash Equivalents - Beginning Of Period | 160.6 | 28.1 | 47.3
Cash and Cash Equivalents - End Of Period | 247.7 | 160.6 | 28.1
Reportable Legal Entities [Member] | Non-guarantor Subsidiaries | Convertible Senior Subordinated Notes |  |  |
Consolidating Financial Information [Line Items] |  |  |
Net Cash Flows Provided By (Used In) Operating Activities | (2,295.4) | 2,535.3 | 22.4
Investing Activities: |  |  |
Proceeds from the sale of equity method investee, net of transaction costs | 393.7 |  | 0.0
Investment in equity method investees | (21.5) | (16.4) | (8.2)
Distributions from equity method investee |  | 2.7 |
Business acquisitions, net of cash acquired of $18.7, $73.5, and $15.8 in 2018, 2017 and 2016, respectively (see Note 2) | (1.8) | (1,102.6) | (126.9)
Capital expenditures | (34.3) | (16.3) | (0.1)
Net Cash Flows Provided By (Used In) Investing Activities | 336.1 | (1,132.6) | (135.2)
Financing Activities: |  |  |
Debt - borrowings | 2,671.1 | 0.0 | 0.0
Debt - repayments | (705.2) | (942.8) | 0.0
Production loans - borrowings | 319.7 | 296.0 | 572.6
Production loans - repayments | (332.8) | (632.6) | (483.1)
Repurchase of common shares |  |  | 0.0
Dividends paid |  | 0.0 | 0.0
Distributions to noncontrolling interest | (8.2) | (6.9) |
Exercise of stock options | 0.0 | 0.0 | 0.0
Tax withholding required on equity awards | 0.0 | 0.0 | 0.0
Net Cash Flows Provided By (Used In) Financing Activities | 1,944.6 | (1,286.3) | 89.5
Net Change In Cash And Cash Equivalents | (14.7) | 116.4 | (23.3)
Foreign Exchange Effects on Cash | (3.2) | 0.8 | 0.4
Cash and Cash Equivalents - Beginning Of Period | 146.2 | 29.0 | 51.9
Cash and Cash Equivalents - End Of Period | $ 128.3 | $ 146.2 | $ 29.0

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