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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) - Recurring Fair Value Measurements - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Unobservable inputs    
Assets measured at fair value $ 195,205.3 $ 191,726.4
Liabilities measured at fair value (1,595.2) (1,248.2)
Fair value hierarchy Level 3    
Unobservable inputs    
Assets measured at fair value 8,020.3 7,614.6
Liabilities measured at fair value (411.4) (296.0)
Fair value hierarchy Level 3 | Available-for-sale | Non-U.S. governments    
Unobservable inputs    
Assets measured at fair value $ 8.4 $ 8.9
Fair value hierarchy Level 3 | Available-for-sale | Non-U.S. governments | Discounted cash flow    
Unobservable inputs    
Discount rate (as a percent) 1.50% 2.20%
Illiquidity premium (as a percent) 0.50% 0.50%
Comparability adjustment (as a percent) (0.25%)  
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) 1.50% 2.20%
Illiquidity premium (as a percent) 0.50% 0.50%
Comparability adjustment (as a percent) (0.25%)  
Fair value hierarchy Level 3 | Available-for-sale | Corporate debt securities    
Unobservable inputs    
Assets measured at fair value $ 49.2 $ 43.2
Fair value hierarchy Level 3 | Available-for-sale | Corporate debt securities | Discounted cash flow | Minimum    
Unobservable inputs    
Discount rate (as a percent) 1.20% 0.00%
Illiquidity premium (as a percent) 0.00% 0.00%
Comparability adjustment (as a percent) 0.00% (0.04%)
Fair value hierarchy Level 3 | Available-for-sale | Corporate debt securities | Discounted cash flow | Maximum    
Unobservable inputs    
Discount rate (as a percent) 7.50% 7.50%
Illiquidity premium (as a percent) 0.60% 0.60%
Comparability adjustment (as a percent) 0.20% 0.07%
Fair value hierarchy Level 3 | Available-for-sale | Corporate debt securities | Discounted cash flow | Weighted average input    
Unobservable inputs    
Discount rate (as a percent) 3.50% 5.10%
Illiquidity premium (as a percent) 0.29% 0.33%
Comparability adjustment (as a percent) 0.06% 0.00%
Fair value hierarchy Level 3 | Available-for-sale | Collateralized debt obligations    
Unobservable inputs    
Assets measured at fair value $ 3.0 $ 3.1
Fair value hierarchy Level 3 | Available-for-sale | Collateralized debt obligations | Discounted cash flow    
Unobservable inputs    
Discount rate (as a percent) 8.50% 28.00%
Probability of default (as a percent) 100.00% 100.00%
Potential loss severity (as a percent) 55.90% 67.00%
Fair value hierarchy Level 3 | Available-for-sale | Collateralized debt obligations | Discounted cash flow | Weighted average input    
Unobservable inputs    
Discount rate (as a percent) 8.50% 28.00%
Probability of default (as a percent) 100.00% 100.00%
Potential loss severity (as a percent) 55.90% 67.00%
Fair value hierarchy Level 3 | Available-for-sale | Other debt obligations    
Unobservable inputs    
Assets measured at fair value $ 6.8 $ 7.5
Fair value hierarchy Level 3 | Available-for-sale | Other debt obligations | Discounted cash flow    
Unobservable inputs    
Discount rate (as a percent) 5.00% 5.00%
Illiquidity premium (as a percent) 7.50% 7.50%
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% 5.00%
Illiquidity premium (as a percent) 7.50% 7.50%
Fair value hierarchy Level 3 | Trading | Fixed maturities    
Unobservable inputs    
Assets measured at fair value $ 10.5 $ 10.5
Fair value hierarchy Level 3 | Trading | Fixed maturities | Discounted cash flow | Minimum    
Unobservable inputs    
Discount rate (as a percent) 1.90% 1.10%
Illiquidity premium (as a percent) 0.00% 0.00%
Fair value hierarchy Level 3 | Trading | Fixed maturities | Discounted cash flow | Maximum    
Unobservable inputs    
Discount rate (as a percent) 2.90% 2.70%
Illiquidity premium (as a percent) 3.00% 3.00%
Fair value hierarchy Level 3 | Trading | Fixed maturities | Discounted cash flow | Weighted average input    
Unobservable inputs    
Discount rate (as a percent) 2.00% 2.60%
Illiquidity premium (as a percent) 2.40% 2.40%
Fair value hierarchy Level 3 | Other investments    
Unobservable inputs    
Assets measured at fair value $ 36.1 $ 35.1
Fair value hierarchy Level 3 | Other investments | Discounted cash flow, equity method real estate investment    
Unobservable inputs    
Discount rate (as a percent) 7.80% 7.80%
Terminal capitalization rate (as a percent) 6.80% 6.80%
Average market rent growth rate (as a percent) 3.00% 3.20%
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% 7.80%
Terminal capitalization rate (as a percent) 6.80% 6.80%
Average market rent growth rate (as a percent) 3.00% 3.20%
Fair value hierarchy Level 3 | Other investments | Discounted cash flow, equity method real estate investment debt    
Unobservable inputs    
Loan to value (as a percent) 52.00% 52.30%
Credit spread rate (as a percent) 2.10% 2.30%
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) 52.00% 52.30%
Credit spread rate (as a percent) 2.10% 2.30%
Fair value hierarchy Level 3 | Separate account assets    
Unobservable inputs    
Assets measured at fair value $ 7,228.0 $ 6,881.8
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, mortgage loans | Minimum    
Unobservable inputs    
Discount rate (as a percent) 1.10% 1.40%
Illiquidity premium (as a percent) 0.00% 0.00%
Credit spread rate (as a percent) 0.76% 0.81%
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, mortgage loans | Maximum    
Unobservable inputs    
Discount rate (as a percent) 7.40% 8.20%
Illiquidity premium (as a percent) 0.60% 0.60%
Credit spread rate (as a percent) 6.99% 7.50%
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, mortgage loans | Weighted average input    
Unobservable inputs    
Discount rate (as a percent) 3.50% 3.90%
Illiquidity premium (as a percent) 0.10% 0.07%
Credit spread rate (as a percent) 2.33% 2.41%
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, real estate | Minimum    
Unobservable inputs    
Discount rate (as a percent) 5.80% 5.30%
Terminal capitalization rate (as a percent) 4.30% 4.30%
Average market rent growth rate (as a percent) 1.90% 2.00%
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, real estate | Maximum    
Unobservable inputs    
Discount rate (as a percent) 19.10% 16.40%
Terminal capitalization rate (as a percent) 9.30% 9.80%
Average market rent growth rate (as a percent) 4.40% 4.30%
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% 7.20%
Terminal capitalization rate (as a percent) 6.20% 6.20%
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) 2.30% 7.80%
Credit spread rate (as a percent) 2.30% 1.40%
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, real estate debt | Maximum    
Unobservable inputs    
Loan to value (as a percent) 71.10% 63.10%
Credit spread rate (as a percent) 4.20% 4.60%
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) 46.80% 47.40%
Credit spread rate (as a percent) 3.30% 2.20%
Fair value hierarchy Level 3 | Investment contracts    
Unobservable inputs    
Liabilities measured at fair value $ (324.3) $ (177.4)
Fair value hierarchy Level 3 | Investment contracts | Discounted cash flow    
Unobservable inputs    
Long duration interest rate (as a percent) 1.80%  
Fair value hierarchy Level 3 | Investment contracts | Discounted cash flow | Minimum    
Unobservable inputs    
Long duration interest rate (as a percent)   2.50%
Long-term equity market volatility (as a percent) 14.90% 14.90%
Non-performance risk (as a percent) 0.50% 0.40%
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%
Long-term equity market volatility (as a percent) 44.70% 44.40%
Non-performance risk (as a percent) 2.10% 1.90%
Lapse rate (as a percent) 14.10% 14.10%