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INVESTMENTS - NARRATIVE (DETAILS) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]          
Trading securities $ 227.4   $ 227.4   $ 247.6
Premium deficiencies adjustments to present value of future profits (134.0)   (134.0)    
Reduction to deferred acquisition costs due to unrealized gains that would result in premium deficiency if unrealized gains were realized (143.3)   (143.3)    
Accumulated Other Comprehensive Income Adjustment to Insurance Liabilities Due to Unrealized Gains That Would Result in Premium Deficiency if Unrealized Gains Were Realized (168.1)   (168.1)   0
Increase to deferred tax assets due to unrealized gains that would result in premium deficiency if unrealized gains were realized 158.3   158.3    
Net realized investment gains (losses) 12.4 3.2 35.8 18.5  
Net realized investment gains, excluding impairment losses 12.4 3.8 47.7 19.1  
Sales of investments     1,377.2 943.5  
Other than temporary impairments recorded     11.9 0.6  
Value of available for sale securities sold     156.9    
Impairment losses related to writedown of mortgage loans which losses major tenants     3.9    
Impairment losses related to private company investments did not meet expectations of previous valuations     8.0    
Other-than-temporary impairments included in accumulated other comprehensive income     3.7    
Total fixed maturities, available for sale
         
Schedule of Available-for-sale Securities [Line Items]          
Net realized investment gains (losses) 1.9 9.4 37.9 24.0  
Available-for-sale Securities, Gross Realized Losses 3.0 1.4 8.5 3.4  
Equity securities
         
Schedule of Available-for-sale Securities [Line Items]          
Net realized investment gains (losses) 7.9 0 7.9 0  
Commercial mortgage loan
         
Schedule of Available-for-sale Securities [Line Items]          
Net realized investment gains (losses) 1.1 0 1.1 0.7  
Other securities
         
Schedule of Available-for-sale Securities [Line Items]          
Net realized investment gains (losses) 1.5 (5.6) 0.8 (5.6)  
US states and political subdivisions debt securities
         
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Gross Realized Losses     0.5    
Corporate debt securities
         
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Gross Realized Losses     8.0    
Embedded derivative financial instruments
         
Schedule of Available-for-sale Securities [Line Items]          
Embedded Derivative, Gain on Embedded Derivative     5.9 10.5  
Marketable securities
         
Schedule of Available-for-sale Securities [Line Items]          
Net realized investment gains, excluding impairment losses     $ 41.8 $ 29.6