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Derivative Financial Instruments - Cash Flow Hedges (Details) - Cash Flow Hedges - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Effect of derivatives in hedging relationships and the related hedged items on the consolidated statements of operations      
Maximum length of time hedging exposure to variability in future cash flows for forecasted transactions 2 years 6 months    
Gross unrealized gains (losses) reported in accumulated OCI related to active hedges of forecasted transactions $ 0.0    
Gross unrealized gains (losses) reclassified from accumulated OCI into net income due to forecasted transaction probable of not occurring 0.0 $ 0.0  
Amount of gain (loss) recognized in accumulated OCI on derivatives (effective portion) (120.2) (21.5) $ 57.1
Amount of gain (loss) reclassified from accumulated OCI on derivatives (effective portion) 31.6 27.7 36.9
Net gains (losses) expected to be reclassified from accumulated OCI into net income in the next 12 months 17.1    
Net realized capital gains (losses)      
Effect of derivatives in hedging relationships and the related hedged items on the consolidated statements of operations      
Gain (loss) resulting from the ineffective portion in cash flow hedging relationships 0.2 0.3 0.0
Fixed maturities, available-for-sale      
Effect of derivatives in hedging relationships and the related hedged items on the consolidated statements of operations      
Gain (loss) on periodic settlements on interest rate and foreign exchange contracts in cash flow hedge of fixed maturities, available-for-sale reported in net investment income 7.1 5.8 6.1
Investment contracts      
Effect of derivatives in hedging relationships and the related hedged items on the consolidated statements of operations      
Gain (loss) on periodic settlements on interest rate and foreign exchange contracts in cash flow hedge of investment contracts reported in benefits, claims and settlement expenses (1.1) (15.7) (18.3)
Interest rate contracts | Fixed maturities, available-for-sale      
Effect of derivatives in hedging relationships and the related hedged items on the consolidated statements of operations      
Amount of gain (loss) recognized in accumulated OCI on derivatives (effective portion) (51.7) (33.1) 33.1
Interest rate contracts | Fixed maturities, available-for-sale | Net investment income      
Effect of derivatives in hedging relationships and the related hedged items on the consolidated statements of operations      
Amount of gain (loss) reclassified from accumulated OCI on derivatives (effective portion) 21.0 19.3 16.6
Interest rate contracts | Fixed maturities, available-for-sale | Net realized capital gains (losses)      
Effect of derivatives in hedging relationships and the related hedged items on the consolidated statements of operations      
Amount of gain (loss) reclassified from accumulated OCI on derivatives (effective portion) (0.6) 11.2  
Interest rate contracts | Investment contracts      
Effect of derivatives in hedging relationships and the related hedged items on the consolidated statements of operations      
Amount of gain (loss) recognized in accumulated OCI on derivatives (effective portion)   1.6 4.7
Interest rate contracts | Hedged debt | Operating expense      
Effect of derivatives in hedging relationships and the related hedged items on the consolidated statements of operations      
Amount of gain (loss) reclassified from accumulated OCI on derivatives (effective portion) (10.8) (9.2) (8.2)
Foreign exchange contracts | Fixed maturities, available-for-sale      
Effect of derivatives in hedging relationships and the related hedged items on the consolidated statements of operations      
Amount of gain (loss) recognized in accumulated OCI on derivatives (effective portion) (68.5) 4.0 16.9
Foreign exchange contracts | Fixed maturities, available-for-sale | Net realized capital gains (losses)      
Effect of derivatives in hedging relationships and the related hedged items on the consolidated statements of operations      
Amount of gain (loss) reclassified from accumulated OCI on derivatives (effective portion) $ 22.0 6.4 28.5
Foreign exchange contracts | Investment contracts      
Effect of derivatives in hedging relationships and the related hedged items on the consolidated statements of operations      
Amount of gain (loss) recognized in accumulated OCI on derivatives (effective portion)   $ 6.0 $ 2.4