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Goodwill and Intangible Assets (Finite-Lived Intangible Assets) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Mar. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  | $ 1,839.1 | $ 1,839.1
Accumulated Amortization |  | 151.4 | 42.4
Net Carrying Amount |  | 1,687.7 | 1,796.7
Customer relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | [1] | 1,821.0 | 1,821.0
Accumulated Amortization | [1] | 141.4 | 33.9
Net Carrying Amount | [1] | 1,679.6 | 1,787.1
Trademarks and trade names |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  | 8.6 | 8.6
Accumulated Amortization |  | 7.2 | 6.9
Net Carrying Amount |  | 1.4 | 1.7
Other |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  | 9.5 | 9.5
Accumulated Amortization |  | 2.8 | 1.6
Net Carrying Amount |  | $ 6.7 | $ 7.9
[1] | Customer relationships primarily represent affiliation agreements with distributors acquired in the Starz Merger (see Note 2).

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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