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Mergers and Acquisitions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 11, 2017 | Dec. 08, 2016 | Nov. 12, 2015 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 11, 2017 | Mar. 31, 2016 | Nov. 30, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Common shares, no par value |  |  |  |  |  |  |  | $ 0
Dissenting shareholders' liability |  |  |  | $ 869.3 | $ 0.0 |  |  |
Accrued merger consideration payable |  |  |  | $ 0.0 | 812.9 |  |  |
Interest rate, percentage spread on federal reserve discount rate |  |  |  | 5.00% |  |  |  |
Principal amount of debt outstanding |  |  |  | $ 2,520.0 | 3,107.5 |  |  |
Goodwill |  |  |  | $ 2,740.8 | $ 2,700.5 |  | $ 534.8 |
Class A Voting Common Shares |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Common shares, no par value |  |  |  | $ 0 | $ 0 |  |  |
Class B Non-Voting Common Shares |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Common shares, no par value |  |  |  | $ 0 | $ 0 |  |  |
Starz |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price, cash consideration |  | $ 1,176.1 |  |  |  |  |  |
Goodwill |  | 2,177.0 |  |  |  |  |  |
Starz | Acquisition-related Costs |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Merger-related transaction costs |  |  |  |  | $ 70.9 |  |  |
Starz | Starz Series A Common Stock |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price, cash consideration |  | 1,123.3 |  |  |  |  |  |
Starz | Starz Series B Common Stock |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price, cash consideration |  | $ 52.8 |  |  |  |  |  |
Starz | Class A Voting Common Shares | Common Stock |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Conversion of Stock, Shares Issued |  | 0.5 |  |  |  |  |  |
Starz | Class B Non-Voting Common Shares | Common Stock |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Conversion of Stock, Shares Issued |  | 0.5 |  |  |  |  |  |
Good Universe |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price, cash consideration | $ 20.4 |  |  |  |  |  |  |
Purchase price, cash consideration to be paid after one-year of the closing date | $ 1.4 |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 29.0 |  |
Period for issuance of equity interests after closing date | 1 year |  |  |  |  |  |  |
Purchase price, loans assumed | $ 23.6 |  |  |  |  |  |  |
Repayments of corporate debt and production loans |  |  |  | $ 14.9 |  |  |  |
Good Universe | Class B Non-Voting Common Shares |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price, common shares issued or issuable (in shares) | 119,751 |  |  |  |  |  |  |
Pilgrim Media Group |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price, common shares issued or issuable (in shares) |  |  | 1,517,451 |  |  |  |  |
Purchase price, cash consideration |  |  | $ 144.7 |  |  |  |  |
Equity interests acquired |  |  | 62.50% |  |  |  |  |
Aggregate purchase price |  |  | $ 201.7 |  |  |  |  |
Purchase price, common shares issued, value assigned |  |  | $ 57.0 |  |  |  |  |
Customer relationships | Starz |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Weighted-average useful life |  | 17 years |  |  |  |  |  |
Starz Dissenting Shareholders | Starz |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Outstanding equity interests (in shares) |  | 25,000,000 |  | 22,500,000 |  |  |  |
Period for demanding appraisal rights |  |  |  | 60 days |  |  |  |
Dissenting shareholders' liability |  |  |  | $ 869.3 |  |  |  |
Shareholders withdrawing demands of appraisal rights (in shares) |  |  |  | 2,510,485 |  |  |  |
Accrued merger consideration payable |  | $ 797.3 |  |  |  |  |  |
Starz Dissenting Shareholders | Starz | Class B Non-Voting Common Shares |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price, common shares issued or issuable (in shares) |  |  |  | 15,300,000 |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Principal amount of debt outstanding |  |  |  | $ 0.0 | $ 0.0 |  |  |
Outstanding obligations |  | 241.0 |  |  |  |  |  |
Revolving Credit Facility | Starz |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Outstanding obligations |  | 255.0 |  |  |  |  |  |
Starz Senior Notes | Senior Notes |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Principal amount of debt outstanding |  | $ 675.0 |  |  |  |  |  |

X
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