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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

X

- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Gross amount of debt extinguished.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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