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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2014
Sep. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Mar. 31, 2013
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale marketable securities, continuous unrealized loss position for more than 12 months     $ 71.4 $ 0.0  
ADS Divesiture          
Schedule of Available-for-sale Securities [Line Items]          
Face value of convertible note receivable received for divestiture of a business         $ 25.0
Convertible note receivable converted to preferred stock amount $ 12.5        
Proceeds from conversion of note receivable   $ 12.5      
Level 3 | ADS Divesiture          
Schedule of Available-for-sale Securities [Line Items]          
Face value of convertible note receivable received for divestiture of a business     $ 25.0