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Derivative Financial Instruments - Fair Value Hedges (Details) - Fair Value Hedges - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Effect of derivatives in hedging relationships and the related hedged items on the consolidated statements of operations    
Amount of gain (loss) recognized in net income on derivatives $ 5.4 $ 1.3
Amount of gain (loss) recognized in net income on related hedged item (5.5) (1.4)
Gain (loss) on periodic settlements on interest rate and foreign exchange contracts in fair value hedge of fixed maturities, available-for-sale reported in net investment income (2.0) (3.2)
Gain (loss) on periodic settlements on interest rate and foreign exchange contracts in fair value hedge of investment contracts reported in benefits, claims and settlement expenses   0.4
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 net income on derivatives 5.4 2.0
Amount of gain (loss) recognized in net income on related hedged item $ (5.5) (2.0)
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 net income on derivatives   (0.7)
Amount of gain (loss) recognized in net income on related hedged item   $ 0.6