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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Oct. 04, 2012
Income Tax Disclosure [Abstract]      
Effective Income Tax Rate, Continuing Operations 23.00% 42.00%  
Other Assets     $ 2.9
Accrued interest epense related to unrecognized income tax benefits 0.2    
Gross unrecognized tax benefits 8.8    
Unrecognized tax benefits related to HRE Trust Fund 7.2    
Total amount of unrecognized tax benefits, if recognized, would affect the effective tax rate 0.9    
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit $ 8.0