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Financing Instruments - Note Purchase Agreement - Guaranty Agreement (Details) - Note Purchase Agreement [Member] - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Dec. 10, 2013
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Restricted stock issued during the period (shares) 3.7 3.1 2.5
Restricted common stock par value (in USD per share) $ 0.01    
Temporary equity redemption price (usd per share) $ 0.60    
Value of restricted stock issued during the period $ 2.2 $ 1.9 $ 1.5