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Fair Value Measurements (Details 2) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value Disclosures [Abstract]                      
Aggregate cost basis for available-for-sale securities $ 47.9       $ 73.6       $ 47.9 $ 73.6 $ 18.6
Other than temporary impairment losses                   4.7  
Proceeds from sale of available-for-sale securities                 68.0 0.0 24.7
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                      
Other income (expense), net $ 0.2 $ 0.3 $ 0.2 $ 36.0 $ (3.6) $ 2.1 $ (2.2) $ 0.1 36.7 $ (3.7) 13.5
Available-for-sale securities transferred to trading       $ 25.7              
Proceeds from trading securities     $ 37.8                
Realized gain on trading securities                 0.4    
Accumulated Net Unrealized Investment Gain | Reclassification out of Accumulated Other Comprehensive Income                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                      
Other income (expense), net                 20.1   $ 6.1
Accumulated Net Unrealized Investment Gain (Loss) Transfered to Trading Securities | Reclassification out of Accumulated Other Comprehensive Income                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                      
Other income (expense), net                 $ 11.7