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Fair Value Measurements - Quantitative Information for Level 3 Measurements (Details) - Recurring Fair Value Measurements - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Unobservable inputs    
Assets measured at fair value $ 191,726.4 $ 193,493.8
Liabilities measured at fair value (1,248.2) (1,278.3)
Fair value hierarchy Level 3    
Unobservable inputs    
Assets measured at fair value 7,614.6 6,628.3
Liabilities measured at fair value (296.0) (278.2)
Fair value hierarchy Level 3 | Available-for-sale | Non-U.S. governments    
Unobservable inputs    
Assets measured at fair value $ 8.9 $ 10.3
Fair value hierarchy Level 3 | Available-for-sale | Non-U.S. governments | Discounted cash flow    
Unobservable inputs    
Discount rate (as a percent) 2.20% 2.20%
Illiquidity premium (as a percent) 0.50% 0.50%
Fair value hierarchy Level 3 | Available-for-sale | Non-U.S. governments | Discounted cash flow | Weighted average input    
Unobservable inputs    
Discount rate (as a percent) 2.20% 2.20%
Illiquidity premium (as a percent) 0.50% 0.50%
Fair value hierarchy Level 3 | Available-for-sale | Corporate debt securities    
Unobservable inputs    
Assets measured at fair value $ 43.2 $ 83.0
Fair value hierarchy Level 3 | Available-for-sale | Corporate debt securities | Discounted cash flow | Minimum    
Unobservable inputs    
Discount rate (as a percent) 0.00% 1.80%
Illiquidity premium (as a percent) 0.00% 0.00%
Comparability adjustment (as a percent) (0.04%) 0.00%
Fair value hierarchy Level 3 | Available-for-sale | Corporate debt securities | Discounted cash flow | Maximum    
Unobservable inputs    
Discount rate (as a percent) 7.50% 6.70%
Illiquidity premium (as a percent) 0.60% 0.25%
Comparability adjustment (as a percent) 0.07% 0.01%
Fair value hierarchy Level 3 | Available-for-sale | Corporate debt securities | Discounted cash flow | Weighted average input    
Unobservable inputs    
Discount rate (as a percent) 5.10% 4.00%
Illiquidity premium (as a percent) 0.33% 0.13%
Comparability adjustment (as a percent) 0.00% 0.00%
Fair value hierarchy Level 3 | Available-for-sale | Collateralized debt obligations    
Unobservable inputs    
Assets measured at fair value $ 3.1 $ 12.7
Fair value hierarchy Level 3 | Available-for-sale | Collateralized debt obligations | Discounted cash flow    
Unobservable inputs    
Discount rate (as a percent) 28.00%  
Probability of default (as a percent) 100.00%  
Potential loss severity (as a percent) 67.00%  
Fair value hierarchy Level 3 | Available-for-sale | Collateralized debt obligations | Discounted cash flow | Minimum    
Unobservable inputs    
Discount rate (as a percent)   2.70%
Probability of default (as a percent)   0.00%
Potential loss severity (as a percent)   0.00%
Fair value hierarchy Level 3 | Available-for-sale | Collateralized debt obligations | Discounted cash flow | Maximum    
Unobservable inputs    
Discount rate (as a percent)   17.10%
Probability of default (as a percent)   100.00%
Potential loss severity (as a percent)   70.00%
Fair value hierarchy Level 3 | Available-for-sale | Collateralized debt obligations | Discounted cash flow | Weighted average input    
Unobservable inputs    
Discount rate (as a percent) 28.00% 6.10%
Probability of default (as a percent) 100.00% 23.50%
Potential loss severity (as a percent) 67.00% 16.40%
Fair value hierarchy Level 3 | Available-for-sale | Other debt obligations    
Unobservable inputs    
Assets measured at fair value $ 7.5 $ 49.3
Fair value hierarchy Level 3 | Available-for-sale | Other debt obligations | Discounted cash flow    
Unobservable inputs    
Discount rate (as a percent) 5.00%  
Illiquidity premium (as a percent) 7.50%  
Fair value hierarchy Level 3 | Available-for-sale | Other debt obligations | Discounted cash flow | Minimum    
Unobservable inputs    
Discount rate (as a percent)   1.40%
Illiquidity premium (as a percent)   0.00%
Fair value hierarchy Level 3 | Available-for-sale | Other debt obligations | Discounted cash flow | Maximum    
Unobservable inputs    
Discount rate (as a percent)   5.00%
Illiquidity premium (as a percent)   10.00%
Fair value hierarchy Level 3 | Available-for-sale | Other debt obligations | Discounted cash flow | Weighted average input    
Unobservable inputs    
Discount rate (as a percent) 5.00% 2.30%
Illiquidity premium (as a percent) 7.50% 1.75%
Fair value hierarchy Level 3 | Trading | Fixed maturities    
Unobservable inputs    
Assets measured at fair value $ 10.5 $ 15.2
Fair value hierarchy Level 3 | Trading | Fixed maturities | Discounted cash flow | Minimum    
Unobservable inputs    
Discount rate (as a percent) 1.10% 1.80%
Illiquidity premium (as a percent) 0.00% 2.00%
Fair value hierarchy Level 3 | Trading | Fixed maturities | Discounted cash flow | Maximum    
Unobservable inputs    
Discount rate (as a percent) 2.70% 126.90%
Illiquidity premium (as a percent) 3.00% 14.00%
Fair value hierarchy Level 3 | Trading | Fixed maturities | Discounted cash flow | Weighted average input    
Unobservable inputs    
Discount rate (as a percent) 2.60% 3.50%
Illiquidity premium (as a percent) 2.40% 4.60%
Fair value hierarchy Level 3 | Trading | Collateralized private investment vehicle | Fixed maturities    
Unobservable inputs    
Assets measured at fair value   $ 100.4
Fair value hierarchy Level 3 | Other investments    
Unobservable inputs    
Assets measured at fair value $ 35.1  
Fair value hierarchy Level 3 | Other investments | Discounted cash flow, commercial mortgage loans of consolidated VIEs    
Unobservable inputs    
Assets measured at fair value   $ 35.0
Discount rate (as a percent)   4.20%
Illiquidity premium (as a percent)   0.76%
Fair value hierarchy Level 3 | Other investments | Discounted cash flow, commercial mortgage loans of consolidated VIEs | Weighted average input    
Unobservable inputs    
Discount rate (as a percent)   4.20%
Illiquidity premium (as a percent)   0.76%
Fair value hierarchy Level 3 | Other investments | Discounted cash flow, equity method real estate investment    
Unobservable inputs    
Assets measured at fair value   $ 92.2
Discount rate (as a percent) 7.80%  
Terminal capitalization rate (as a percent) 6.80%  
Average market rent growth rate (as a percent) 3.20%  
Fair value hierarchy Level 3 | Other investments | Discounted cash flow, equity method real estate investment | Minimum    
Unobservable inputs    
Discount rate (as a percent)   7.30%
Terminal capitalization rate (as a percent)   5.50%
Average market rent growth rate (as a percent)   3.30%
Fair value hierarchy Level 3 | Other investments | Discounted cash flow, equity method real estate investment | Maximum    
Unobservable inputs    
Discount rate (as a percent)   8.00%
Terminal capitalization rate (as a percent)   6.80%
Average market rent growth rate (as a percent)   3.70%
Fair value hierarchy Level 3 | Other investments | Discounted cash flow, equity method real estate investment | Weighted average input    
Unobservable inputs    
Discount rate (as a percent) 7.80% 7.60%
Terminal capitalization rate (as a percent) 6.80% 6.10%
Average market rent growth rate (as a percent) 3.20% 3.50%
Fair value hierarchy Level 3 | Other investments | Discounted cash flow, equity method real estate investment debt    
Unobservable inputs    
Loan to value (as a percent) 52.30%  
Credit spread rate (as a percent) 2.30%  
Fair value hierarchy Level 3 | Other investments | Discounted cash flow, equity method real estate investment debt | Minimum    
Unobservable inputs    
Loan to value (as a percent)   34.20%
Credit spread rate (as a percent)   1.80%
Fair value hierarchy Level 3 | Other investments | Discounted cash flow, equity method real estate investment debt | Maximum    
Unobservable inputs    
Loan to value (as a percent)   58.90%
Credit spread rate (as a percent)   2.00%
Fair value hierarchy Level 3 | Other investments | Discounted cash flow, equity method real estate investment debt | Weighted average input    
Unobservable inputs    
Loan to value (as a percent) 52.30% 46.50%
Credit spread rate (as a percent) 2.30% 1.90%
Fair value hierarchy Level 3 | Separate account assets    
Unobservable inputs    
Assets measured at fair value $ 6,881.8 $ 5,857.4
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, mortgage loans | Minimum    
Unobservable inputs    
Discount rate (as a percent) 1.40% 1.10%
Illiquidity premium (as a percent) 0.00% 0.00%
Credit spread rate (as a percent) 0.81% 0.70%
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, mortgage loans | Maximum    
Unobservable inputs    
Discount rate (as a percent) 8.20% 6.90%
Illiquidity premium (as a percent) 0.60% 0.60%
Credit spread rate (as a percent) 7.50% 6.32%
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, mortgage loans | Weighted average input    
Unobservable inputs    
Discount rate (as a percent) 3.90% 3.20%
Illiquidity premium (as a percent) 0.07% 0.07%
Credit spread rate (as a percent) 2.41% 2.21%
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, real estate | Minimum    
Unobservable inputs    
Discount rate (as a percent) 5.30% 6.00%
Terminal capitalization rate (as a percent) 4.30% 4.50%
Average market rent growth rate (as a percent) 2.00% 1.30%
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, real estate | Maximum    
Unobservable inputs    
Discount rate (as a percent) 16.40% 24.60%
Terminal capitalization rate (as a percent) 9.80% 9.50%
Average market rent growth rate (as a percent) 4.30% 4.40%
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, real estate | Weighted average input    
Unobservable inputs    
Discount rate (as a percent) 7.20% 7.40%
Terminal capitalization rate (as a percent) 6.20% 6.40%
Average market rent growth rate (as a percent) 3.00% 3.00%
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, real estate debt | Minimum    
Unobservable inputs    
Loan to value (as a percent) 7.80% 6.80%
Credit spread rate (as a percent) 1.40% 2.10%
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, real estate debt | Maximum    
Unobservable inputs    
Loan to value (as a percent) 63.10% 64.10%
Credit spread rate (as a percent) 4.60% 4.80%
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, real estate debt | Weighted average input    
Unobservable inputs    
Loan to value (as a percent) 47.40% 46.50%
Credit spread rate (as a percent) 2.20% 3.40%
Fair value hierarchy Level 3 | Investment contracts    
Unobservable inputs    
Liabilities measured at fair value $ (177.4) $ (176.4)
Fair value hierarchy Level 3 | Investment contracts | Discounted cash flow | Minimum    
Unobservable inputs    
Long duration interest rate (as a percent) 2.50% 2.60%
Long-term equity market volatility (as a percent) 14.90% 14.90%
Non-performance risk (as a percent) 0.40% 0.10%
Lapse rate (as a percent) 0.50% 0.50%
Fair value hierarchy Level 3 | Investment contracts | Discounted cash flow | Maximum    
Unobservable inputs    
Long duration interest rate (as a percent) 2.60% 2.70%
Long-term equity market volatility (as a percent) 44.40% 39.50%
Non-performance risk (as a percent) 1.90% 1.40%
Lapse rate (as a percent) 14.10% 14.10%
Fair value hierarchy Level 3 | Derivative liabilities    
Unobservable inputs    
Liabilities measured at fair value   $ (19.3)
Fair value hierarchy Level 3 | Other liabilities    
Unobservable inputs    
Liabilities measured at fair value   $ (66.3)