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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, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Feb. 04, 2019 | Apr. 15, 2018 | Oct. 27, 2016
Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity | $ 1,500.0 |  | $ 1,000.0 | $ 1,500.0 |  |  |  |  |
Debt instrument, term | 5 years |  | 5 years |  |  |  |  |  |
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 |  |  |  |  |  |
Principal amount of debt prepaid | $ 825.0 | $ 25.0 |  |  | $ 740.0 | $ 400.0 |  |  |
Term Loan | Term Loan A Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, term | 5 years |  |  |  |  |  |  |  |
Principal amount of notes | $ 750.0 |  |  |  |  |  |  |  |
Term Loan | Term Loan B Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, term | 7 years |  |  |  |  |  |  |  |
Principal amount of notes | $ 1,250.0 |  |  |  |  |  |  |  |
Repayments of Lines of Credit |  |  |  | $ 130.0 |  |  |  |  |
Senior Notes | 5.875% Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  |  |  |  |  |  | $ 520.0
Coupon rate |  |  |  | 5.875% |  |  |  |  |
Senior Notes | 6.375% Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  |  |  |  | $ 550.0 |  |
Coupon rate |  |  |  | 6.375% |  |  |  |  |
Convertible Senior Subordinated Notes | April 2013 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Coupon rate |  |  |  | 1.25% |  |  |  | 1.25% |
Starz | Starz Merger Financing |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from revolving credit facility used to finance a portion of Starz merger consideration |  |  | $ 50.0 |  |  |  |  |  |

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