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Income Taxes Income Tax (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2012
Oct. 31, 2011
Income Tax Disclosure [Abstract]        
Effective Income Tax Rate, Continuing Operations 14.00% 20.00% 23.00% 21.00%
Effective Tax Rate - Increase/Decrease in the effective tax rate 6.00%   2.00%  
Discrete Tax Items $ 15.4   $ 19.0  
Effective tax rate excluding the impact of discrete tax items 25.00%      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate 35.00%      
Unrecognized Tax Benefits (in usd) 206.0   206.0  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate (in usd) 195.3   195.3  
Deferred Tax Assets, Net (in usd) $ 176.7   $ 176.7