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Derivative Financial Instruments - Fair Value Hedges (Details) - Fair Value 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      
Amount of gain (loss) recognized in net income on derivatives $ 4.1 $ 18.6 $ 31.0
Amount of gain (loss) recognized in net income on related hedged item (4.6) (18.2) (30.6)
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 fair value hedge of fixed maturities, available-for-sale reported in net investment income (10.3) (41.9) (72.8)
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 fair value hedge of investment contracts reported in benefits, claims and settlement expenses 0.9 2.6 3.7
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 4.7 19.5 26.4
Amount of gain (loss) recognized in net income on related hedged item (5.2) (19.2) (26.1)
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 (0.6) (0.9) 0.8
Amount of gain (loss) recognized in net income on related hedged item $ 0.6 $ 1.0 (0.7)
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 net income on derivatives     3.8
Amount of gain (loss) recognized in net income on related hedged item     $ (3.8)