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Derivative Financial Instruments - Cash Flow Hedges (Details) - Cash Flow Hedges - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 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 2 months 12 days  
Gross unrealized gains (losses) reported in accumulated OCI related to active hedges of forecasted transactions $ 11.8  
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) (52.5) 26.9
Amount of gain (loss) reclassified from accumulated OCI on derivatives (effective portion) 12.5 3.0
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 1.8 1.5
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 (0.8) (5.0)
Net gains (losses) expected to be reclassified from accumulated OCI into net income in the next 12 months 15.7  
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) (32.3) 28.6
Amount of gain (loss) reclassified from accumulated OCI on derivatives (effective portion) 5.2 4.6
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) (0.7)  
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)   1.1
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) (2.2)
Foreign exchange contracts | 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 0.0
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) (20.2) (5.4)
Amount of gain (loss) reclassified from accumulated OCI on derivatives (effective portion) $ 10.6 0.6
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)   $ 2.6