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Taxes on Income (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Mar. 31, 2012
Sep. 30, 2013
Sep. 30, 2012
Income Tax Disclosure [Abstract]          
Effective tax rate (as percent) 35.40% 34.20% 42.60% 42.00%  
Expected effective income tax rate (as percent)       41.00%  
Provision for taxes on income $ (132.4) $ (130.8)   $ (287.7) $ (225.7)