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Derivative Financial Instruments - Effect of Hedges on Consolidated Statements of Operations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Gains (losses) recognized for hedging relationships      
Net investment income (loss) $ 3,998.4 $ 3,629.2 $ 3,459.3
Net realized capital gains (losses) (52.8) (75.4) 524.2
Benefits, claims and settlement expenses (9,905.8) (8,192.5) (7,822.6)
Operating expenses (4,503.9) (4,136.7) (3,893.8)
Fair Value Hedges | Interest rate contracts | Net investment income      
Gains (losses) recognized for hedging relationships      
Gain (loss) recognized on hedged item 5.7    
Gain (loss) recognized on derivatives (6.0)    
Amortization of hedged item basis adjustments (4.2) (6.7) (11.6)
Amounts related to periodic settlements on derivatives (3.4) (5.9) (10.3)
Total gain (loss) recognized for hedging relationships (7.9) (12.6) (21.9)
Fair Value Hedges | Interest rate contracts | Net realized capital gains (losses)      
Gains (losses) recognized for hedging relationships      
Gain (loss) recognized on hedged item   (6.6) (4.6)
Gain (loss) recognized on derivatives   6.2 4.1
Total gain (loss) recognized for hedging relationships   (0.4) (0.5)
Fair Value Hedges | Interest rate contracts | Benefits, claims and settlement expenses      
Gains (losses) recognized for hedging relationships      
Amortization of hedged item basis adjustments     (0.5)
Amounts related to periodic settlements on derivatives     0.9
Total gain (loss) recognized for hedging relationships     0.4
Fair Value Hedges | Interest rate contracts | Fixed maturities, available-for-sale | Net realized capital gains (losses)      
Gains (losses) recognized for hedging relationships      
Gain (loss) recognized on hedged item     (5.2)
Gain (loss) recognized on derivatives     4.7
Total gain (loss) recognized for hedging relationships     (0.5)
Fair Value Hedges | Interest rate contracts | Investment contracts | Net realized capital gains (losses)      
Gains (losses) recognized for hedging relationships      
Gain (loss) recognized on hedged item     0.6
Gain (loss) recognized on derivatives     (0.6)
Cash Flow Hedges | Net investment income      
Gains (losses) recognized for hedging relationships      
Total gain (loss) recognized for hedging relationships 27.2 26.9  
Cash Flow Hedges | Net realized capital gains (losses)      
Gains (losses) recognized for hedging relationships      
Total gain (loss) recognized for hedging relationships 9.0 30.0  
Cash Flow Hedges | Benefits, claims and settlement expenses      
Gains (losses) recognized for hedging relationships      
Total gain (loss) recognized for hedging relationships (0.1) (0.2)  
Cash Flow Hedges | Operating expense      
Gains (losses) recognized for hedging relationships      
Total gain (loss) recognized for hedging relationships (4.8) (10.7)  
Cash Flow Hedges | Interest rate contracts | Gain (loss) reclassified from AOCI on derivatives      
Gains (losses) recognized for hedging relationships      
Net investment income (loss) 19.8 20.9 21.0
Net realized capital gains (losses) (0.6) 17.0 (0.6)
Benefits, claims and settlement expenses (0.1) (0.1)  
Operating expenses (4.8) (10.7) (10.8)
Cash Flow Hedges | Interest rate contracts | Net realized capital gains (losses)      
Gains (losses) recognized for hedging relationships      
Gain (loss) reclassified from AOCI into net income as a result that a forecasted transaction is no longer probable of occurring 0.1 0.3 0.2
Cash Flow Hedges | Interest rate contracts | Fixed maturities, available-for-sale | Gain (loss) reclassified from AOCI on derivatives      
Gains (losses) recognized for hedging relationships      
Net realized capital gains (losses)     (0.6)
Cash Flow Hedges | Interest rate contracts | Fixed maturities, available-for-sale | Net realized capital gains (losses)      
Gains (losses) recognized for hedging relationships      
Gain (loss) reclassified from AOCI into net income as a result that a forecasted transaction is no longer probable of occurring     0.2
Cash Flow Hedges | Foreign exchange contracts | Gain (loss) reclassified from AOCI on derivatives      
Gains (losses) recognized for hedging relationships      
Net realized capital gains (losses) 9.5 12.7 22.0
Cash Flow Hedges | Foreign exchange contracts | Net investment income      
Gains (losses) recognized for hedging relationships      
Amounts related to periodic settlements on derivatives $ 7.4 6.0 7.1
Total gain (loss) recognized for hedging relationships     28.1
Cash Flow Hedges | Foreign exchange contracts | Net realized capital gains (losses)      
Gains (losses) recognized for hedging relationships      
Total gain (loss) recognized for hedging relationships     21.6
Cash Flow Hedges | Foreign exchange contracts | Benefits, claims and settlement expenses      
Gains (losses) recognized for hedging relationships      
Amounts related to periodic settlements on derivatives   $ (0.1) (1.1)
Total gain (loss) recognized for hedging relationships     (1.1)
Cash Flow Hedges | Foreign exchange contracts | Operating expense      
Gains (losses) recognized for hedging relationships      
Total gain (loss) recognized for hedging relationships     (10.8)
Cash Flow Hedges | Foreign exchange contracts | Fixed maturities, available-for-sale | Gain (loss) reclassified from AOCI on derivatives      
Gains (losses) recognized for hedging relationships      
Net realized capital gains (losses)     22.0
Cash Flow Hedges | Foreign exchange contracts | Fixed maturities, available-for-sale | Net realized capital gains (losses)      
Gains (losses) recognized for hedging relationships      
Total gain (loss) recognized for hedging relationships     $ 21.6