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Investments - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Nov. 30, 2014
Sep. 30, 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]      
Investment securities, maturities range   1 year  
Maximum      
Investment [Line Items]      
Investment securities, 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