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Debt (Narrative - Debt Transactions) (Details) - USD ($) $ in Millions |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 22, 2018 | Dec. 11, 2017 | Dec. 08, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 28, 2018 | Dec. 12, 2017 | Dec. 07, 2016 | Oct. 27, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  | $ 35.7 | $ 40.4 | $ 0.0 |  |  |  |
Coupon rate |  |  |  |  | 5.875% |  |  |  |  |  |
Principal amount of debt outstanding |  |  |  |  | $ 2,520.0 | 3,107.5 |  |  |  |  |
Senior Secured Second-Priority Notes | 5.25% Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Coupon rate |  |  |  |  | 5.25% |  |  |  |  |  |
Principal amount of debt outstanding |  |  |  | $ 225.0 |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  | $ 1,500.0 |  | $ 1,000.0 | $ 1,500.0 |  |  |  |  | $ 800.0 |
Debt instrument, term |  | 5 years |  | 5 years |  |  |  |  |  |  |
Outstanding obligations |  |  |  | $ 241.0 |  |  |  |  |  |  |
Principal amount of debt outstanding |  |  |  |  | $ 0.0 | 0.0 |  |  |  |  |
Revolving Credit Facility | Base Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable interest rate |  |  |  |  | 0.75% |  |  |  |  |  |
Revolving Credit Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable interest rate |  |  |  |  | 1.75% |  |  |  |  |  |
Term Loan | Previous Term Loan A |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  | 5 years |  |  |  |  |  |  |
Principal amount of notes |  |  |  | $ 1,000.0 |  |  |  |  |  |  |
Principal amount of debt prepaid |  | $ 950.0 |  |  |  |  |  |  |  |  |
Term Loan | Previous Term Loan B |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  | 7 years |  |  |  |  |  |  |
Principal amount of notes |  |  |  | $ 2,000.0 |  |  |  |  | $ 900.0 |  |
Previous Term loan B facility, initial issuance price, percentage |  |  |  | 99.50% |  |  |  |  |  |  |
Principal amount of debt prepaid |  |  | $ 25.0 |  |  |  |  |  |  |  |
Term Loan | Previous Term Loan B-1 Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  | 6 years |  |  |  |  |  |  |  |
Principal amount of notes |  |  | $ 900.0 |  |  |  |  |  |  |  |
Principal amount of debt prepaid |  | $ 825.0 |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage, amount less than previous interest rate |  |  | 0.75% |  |  |  |  |  |  |  |
Term Loan | Previous Term Loan B-1 Facility | Base Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable interest rate |  |  | 1.25% |  |  |  |  |  |  |  |
Term Loan | Previous Term Loan B-1 Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable interest rate |  |  | 2.25% |  |  |  |  |  |  |  |
Term Loan | Term Loan A Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  | 5 years |  |  |  |  |  |  |  |  |
Principal amount of notes |  | $ 750.0 |  |  |  |  |  |  |  |  |
Principal amount of debt outstanding | [1] |  |  |  | $ 750.0 | 987.5 |  |  |  |  |
Term Loan | Term Loan A Facility | Base Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable interest rate |  |  |  |  | 0.75% |  |  |  |  |  |
Term Loan | Term Loan A Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable interest rate |  |  |  |  | 1.75% |  |  |  |  |  |
Term Loan | Term Loan B Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  | 7 years |  |  |  |  |  |  |  |  |
Principal amount of notes |  | $ 1,250.0 |  |  |  |  |  |  |  |  |
Principal amount of debt outstanding | [1] |  |  |  | $ 1,250.0 | 1,600.0 |  |  |  |  |
Term Loan | Term Loan B Facility | Base Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable interest rate |  | 1.25% |  |  |  |  |  |  |  |  |
Term Loan | Term Loan B Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable interest rate |  | 2.25% |  |  |  |  |  |  |  |  |
Term Loan | Previous Term Loan B & Previous Term Loan B-1 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt prepaid |  |  |  |  | $ 740.0 | $ 400.0 |  |  |  |  |
Term Loan | Term Loan Due 2022 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  | 7 years |  |  |  |  |  |  |
Principal amount of debt outstanding |  |  |  | $ 400.0 |  |  |  |  |  |  |
Senior Notes | 2016 5.875% Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  |  |  |  |  |  |  |  | $ 520.0
Senior Notes | 2018 5.875% Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  |  |  |  |  | $ 512.3 |  |  |
Senior Notes | Starz Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt outstanding |  |  |  | 675.0 |  |  |  |  |  |  |
Starz | Starz Merger Financing |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from revolving credit facility used to finance a portion of Starz merger consideration |  |  |  | 50.0 |  |  |  |  |  |  |
Starz | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 1,000.0 |
Outstanding obligations |  |  |  | $ 255.0 |  |  |  |  |  |  |
Minimum | Revolving Credit Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Coupon rate |  |  |  |  | 0.00% |  |  |  |  |  |
Minimum | Term Loan | Previous Term Loan B-1 Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Coupon rate |  |  | 0.75% |  |  |  |  |  |  |  |
Minimum | Term Loan | Term Loan A Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Coupon rate |  |  |  |  | 0.00% |  |  |  |  |  |
Minimum | Term Loan | Term Loan B Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Coupon rate |  |  |  |  | 0.00% |  |  |  |  |  |
[1] | As of March 31, 2017, amounts were outstanding under the Previous Term Loan A and Previous Term Loan B, as defined below under the "Debt Transactions" section.

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