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Debt (Summary of Loss on Extinguishment of Debt) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Extinguishment of Debt [Line Items]
Loss on extinguishment of debt	$ 40.4	$ 0.0	$ 11.7
Revolving Credit Facility
Extinguishment of Debt [Line Items]
Loss on extinguishment of debt	0.6		0.0
Term Loan Due 2022 & 5.25% Senior Notes
Extinguishment of Debt [Line Items]
Loss on extinguishment of debt	24.5		0.0
Starz credit facility & Starz Senior Notes
Extinguishment of Debt [Line Items]
Loss on extinguishment of debt	3.2		0.0
Term Loan B Facility
Extinguishment of Debt [Line Items]
Loss on extinguishment of debt	12.1		0.0
Term Loan Due 2020
Extinguishment of Debt [Line Items]
Loss on extinguishment of debt	0.0		10.4
Convertible Senior Subordinated Notes
Extinguishment of Debt [Line Items]
Loss on extinguishment of debt	$ 0.0		$ 1.3

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629

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