Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Anti-dilutive Securities Excluded from EPS Calculation (Details)

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Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Anti-dilutive Securities Excluded from EPS Calculation (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jul. 27, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
UMG Recordings - share price threshold | Common Stock          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Stock issued during period, litigation (in shares)   900,000      
Emerging Markets Communications LLC          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Deferred compensation to be paid $ 25.0        
Employee stock options          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Antidilutive securities excluded from computation of earnings per share (in shares)   6,600,000 3,545,000 6,076,000 3,004,000
Restricted stock units          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Antidilutive securities excluded from computation of earnings per share (in shares)   147,000 190,000 253,000 44,000
Non-employee stock options          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Antidilutive securities excluded from computation of earnings per share (in shares)   0 0 0 2,000
Equity warrants (1)          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Antidilutive securities excluded from computation of earnings per share (in shares)   1,163,000 392,000 1,163,000 475,000
Liability warrants (2)          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Antidilutive securities excluded from computation of earnings per share (in shares)   6,173,000 411,000 6,173,000 0
Convertible notes          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Antidilutive securities excluded from computation of earnings per share (in shares)   4,447,000 4,447,000 4,447,000 3,663,000
EMC deferred consideration (3)          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Antidilutive securities excluded from computation of earnings per share (in shares)   0 0 503,000 0
Contingently issuable shares (4)          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Antidilutive securities excluded from computation of earnings per share (in shares)   509,000 0 171,000 0