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Redeemable Noncontrolling Interests (Narrative) (Details)
Mar. 31, 2015
Oct. 23, 2014
Noncontrolling Interest [Line Items]    
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 50.10%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners  
New Video (BBC AMERICA) [Member]    
Noncontrolling Interest [Line Items]    
Equity Method Investment, Ownership Percentage   49.90%us-gaap_EquityMethodInvestmentOwnershipPercentage
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