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Acquisition (Details 3) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Business Acquisition        
Total revenues $ 2,239.6 $ 2,704.7 $ 6,616.9 $ 6,919.2
Net income (loss) 259.1 198.8 685.7 598.7
Cuprum
       
Business Acquisition        
Total revenues 44.1   120.8  
Net income (loss) $ 17.3   $ 52.7