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Investments - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Nov. 30, 2014
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Highview Enterprises Limited        
Investment [Line Items]        
Ownership interest, percent 8.00%      
Payments to acquire investments $ 2.8      
Minimum        
Investment [Line Items]        
Remaining maturities range   1 year    
Maximum        
Investment [Line Items]        
Remaining maturities range   5 years    
Cost method investment        
Investment [Line Items]        
Available-for-sale securities, debt securities     $ 2.8 $ 2.8
Certificates of deposit        
Investment [Line Items]        
Investments     $ 0.3 $ 0.3