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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Income taxes    
Net deferred income tax liability, consolidated $ 492  
Net deferred income tax liability 492.0 450.0
Deferred tax asset valuation allowance 0  
Indemnity
   
Income taxes    
Net deferred income tax liability 0.2 0
Effective tax rate when investment related permanent tax differences are excluded (as a percent) 35.00%  
Exchange
   
Income taxes    
Net deferred income tax liability $ 492.0 $ 450.0
Effective tax rate when investment related permanent tax differences are excluded (as a percent) 35.00%  
Minimum | Indemnity
   
Income taxes    
Percent of total permanent tax differences related to investment revenues (as a percent) 98.00%  
Minimum | Exchange
   
Income taxes    
Percent of total permanent tax differences related to investment revenues (as a percent) 98.00%