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Subsequent Event Subsequent Event (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended
Dec. 28, 2013
Dec. 28, 2013
Prothena [Member]
Feb. 06, 2014
Prothena [Member]
Subsequent Event [Member]
Jan. 29, 2014
Prothena [Member]
Subsequent Event [Member]
Subsequent Event [Line Items]        
Investment, Ownership Percentage   14.60%    
Number of shares of investment sold through tender offer       2,767,177
Share Price       $ 26.00
Number of shares of investment sold through option agreement       415,076
Proceeds from Sale of Available-for-sale Securities     $ 79.4  
Equity securities - current, at cost less impairments 90.3 84.4    
Unrealized gains (losses) on equity securities   (4.8)    
Loss on sale of investment securities     $ 9.8