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Investments (Realized Gains and Losses and Proceeds on Investments and Other Assets) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Realized gains and losses and proceeds on investments and other assets      
Realized gains and losses, net $ 6.7 $ 235.7 $ 25.8
Gross Proceeds from Sale, Maturity and Call of Investments and Other Assets 1,326.0 1,622.4 1,243.9
Fixed Maturity Securities, Available for Sale
     
Realized gains and losses and proceeds on investments and other assets      
Fixed Maturity Securities, Gross Realized Gains 37.5 90.3 36.3
Fixed Maturity Securities, Gross Realized Losses (17.8) (1.7) (2.6)
Available-for-sale Securities, Gross Realized Gain (Loss) 19.7 88.6 33.7
Gross Proceeds from Sale, Maturity and Call of Investments 1,205.6 1,348.8 1,130.1
Preferred Stock, Available for Sale
     
Realized gains and losses and proceeds on investments and other assets      
Fixed Maturity Securities, Gross Realized Gains 0.1    
Fixed Maturity Securities, Gross Realized Losses (0.1)    
Available-for-sale Securities, Gross Realized Gain (Loss) 0    
Gross Proceeds from Sale, Maturity and Call of Investments 21.0    
Equity Securities, Available for Sale
     
Realized gains and losses and proceeds on investments and other assets      
Fixed Maturity Securities, Gross Realized Gains 1.9 26.3 5.3
Fixed Maturity Securities, Gross Realized Losses 0 0 (21.5)
Available-for-sale Securities, Gross Realized Gain (Loss) 1.9 26.3 (16.2)
Gross Proceeds from Sale, Maturity and Call of Investments 16.3 59.9 60.0
Other Long-term Investments
     
Realized gains and losses and proceeds on investments and other assets      
Realized gains and losses, net (4.4) 109.8 3.7
Gross Proceeds from Sale, Maturity and Call of Investments 77.7 193.6 0
Other Assets [Member]
     
Realized gains and losses and proceeds on investments and other assets      
Realized gains and losses, net (10.5) 11.0 4.6
Gross Proceeds from Sale, Maturity and Call of Investments $ 5.4 $ 20.1 $ 53.8