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Derivative Financial Instruments - Cash Flow Hedges (Details) - Cash Flow Hedges - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
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     3 years  
Gross unrealized gains (losses) reported in accumulated OCI related to active hedges of forecasted transactions $ 7.9   $ 7.9  
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) (16.1) $ 5.8 (68.6) 32.7
Amount of gain (loss) reclassified from accumulated OCI on derivatives (effective portion) 6.0 3.1 18.5 6.1
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 1.6 1.4 3.4 2.9
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 (0.1) (4.3) (0.9) (9.3)
Net gains (losses) expected to be reclassified from accumulated OCI into net income in the next 12 months     16.2  
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 0.0 (0.1) 0.0 (0.1)
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) recognized in accumulated OCI on derivatives (effective portion) (6.8) (6.9) (39.1) 21.7
Amount of gain (loss) reclassified from accumulated OCI on derivatives (effective portion) 5.1 4.8 10.3 9.4
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)     (0.7)  
Interest rate contracts | Investment contracts | Benefits, claims and settlement expenses        
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)   0.5   1.6
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) (2.6) (2.3) (5.2) (4.5)
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) recognized in accumulated OCI on derivatives (effective portion) (9.4) 10.9 (29.6) 5.5
Amount of gain (loss) reclassified from accumulated OCI on derivatives (effective portion) 3.5 0.6 14.1 1.2
Foreign exchange contracts | Investment contracts | Benefits, claims and settlement expenses        
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) $ 0.1 $ 1.3 $ 0.1 $ 3.9