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Fair Value Measurements (Details 2) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Mar. 31, 2015
Fair value measurements          
Proceeds from sale of available-for-sale securities     $ 68.0 $ 0.0  
Aggregate cost basis $ 47.9   47.9    
Other income (expense), net 0.2 $ (2.2) 36.3 $ (2.1)  
Aggregate cost basis, AFS securities reclassified to trading securities         $ 25.7
Proceeds from sale of trading securities 37.8        
Realized gain on trading securities $ 0.4   0.4    
Reclassification out of AOCI | Accumulated Net Unrealized Investment Gain (Loss)          
Fair value measurements          
Other income (expense), net     20.1    
Reclassification out of AOCI | Accumulated Net Unrealized Investment Gain (Loss) Transfered to Trading Securities          
Fair value measurements          
Other income (expense), net     $ 11.7