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Fair Value Measurements (Details 4) - Recurring Fair Value Measurements - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Unobservable inputs    
Assets measured at fair value $ 188,271.3 $ 193,493.8
Liabilities measured at fair value (1,328.6) (1,278.3)
Fair value hierarchy Level 3    
Unobservable inputs    
Assets measured at fair value 7,340.9 6,628.3
Liabilities measured at fair value (320.7) (278.2)
Fair value hierarchy Level 3 | Available-for-sale | Non-U.S. governments | Discounted cash flow    
Unobservable inputs    
Assets measured at fair value $ 9.4 $ 10.3
Discount rate (as a percent) 1.70% 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) 1.70% 2.20%
Illiquidity premium (as a percent) 0.50% 0.50%
Fair value hierarchy Level 3 | Available-for-sale | Corporate debt securities | Discounted cash flow    
Unobservable inputs    
Assets measured at fair value $ 42.0 $ 83.0
Fair value hierarchy Level 3 | Available-for-sale | Corporate debt securities | Discounted cash flow | Minimum    
Unobservable inputs    
Discount rate (as a percent) 1.60% 1.80%
Illiquidity premium (as a percent) 0.00% 0.00%
Comparability adjustment (as a percent) 0.00% 0.00%
Fair value hierarchy Level 3 | Available-for-sale | Corporate debt securities | Discounted cash flow | Maximum    
Unobservable inputs    
Discount rate (as a percent) 7.60% 6.70%
Illiquidity premium (as a percent) 0.60% 0.25%
Comparability adjustment (as a percent) 0.14% 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) 4.80% 4.00%
Illiquidity premium (as a percent) 0.34% 0.13%
Comparability adjustment (as a percent) 0.03% 0.00%
Fair value hierarchy Level 3 | Available-for-sale | Commercial mortgage-backed securities | Discounted cash flow    
Unobservable inputs    
Assets measured at fair value $ 15.3  
Fair value hierarchy Level 3 | Available-for-sale | Commercial mortgage-backed securities | Discounted cash flow | Minimum    
Unobservable inputs    
Discount rate (as a percent) 3.70%  
Fair value hierarchy Level 3 | Available-for-sale | Commercial mortgage-backed securities | Discounted cash flow | Maximum    
Unobservable inputs    
Discount rate (as a percent) 4.90%  
Fair value hierarchy Level 3 | Available-for-sale | Commercial mortgage-backed securities | Discounted cash flow | Weighted average input    
Unobservable inputs    
Discount rate (as a percent) 4.30%  
Fair value hierarchy Level 3 | Available-for-sale | Collateralized debt obligations | Discounted cash flow    
Unobservable inputs    
Assets measured at fair value $ 3.1 $ 12.7
Discount rate (as a percent) 12.10%  
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) 12.10% 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 | Discounted cash flow    
Unobservable inputs    
Assets measured at fair value $ 7.8 $ 49.3
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 | Discounted cash flow    
Unobservable inputs    
Assets measured at fair value $ 14.2 $ 15.2
Fair value hierarchy Level 3 | Trading | Fixed maturities | Discounted cash flow | Minimum    
Unobservable inputs    
Discount rate (as a percent) 2.10% 1.80%
Illiquidity premium (as a percent) 2.00% 2.00%
Fair value hierarchy Level 3 | Trading | Fixed maturities | Discounted cash flow | Maximum    
Unobservable inputs    
Discount rate (as a percent) 16.00% 126.90%
Illiquidity premium (as a percent) 8.00% 14.00%
Fair value hierarchy Level 3 | Trading | Fixed maturities | Discounted cash flow | Weighted average input    
Unobservable inputs    
Discount rate (as a percent) 6.40% 3.50%
Illiquidity premium (as a percent) 4.30% 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 | 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 and equity method real estate investment debt    
Unobservable inputs    
Assets measured at fair value $ 31.5 $ 92.2
Fair value hierarchy Level 3 | Other investments | Discounted cash flow, equity method real estate investment    
Unobservable inputs    
Discount rate (as a percent) 7.90%  
Terminal capitalization rate (as a percent) 6.80%  
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 | 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) 7.90% 7.60%
Terminal capitalization rate (as a percent) 6.80% 6.10%
Average market rent growth rate (as a percent) 3.30% 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) 54.90%  
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) 54.90% 46.50%
Credit spread rate (as a percent) 2.30% 1.90%
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, mortgage loans, real estate and real estate debt    
Unobservable inputs    
Assets measured at fair value $ 6,616.4 $ 5,857.4
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, mortgage loans | Minimum    
Unobservable inputs    
Discount rate (as a percent) 1.10% 1.10%
Illiquidity premium (as a percent) 0.00% 0.00%
Credit spread rate (as a percent) 0.85% 0.70%
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, mortgage loans | Maximum    
Unobservable inputs    
Discount rate (as a percent) 7.10% 6.90%
Illiquidity premium (as a percent) 0.60% 0.60%
Credit spread rate (as a percent) 6.65% 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) 3.30% 3.20%
Illiquidity premium (as a percent) 0.07% 0.07%
Credit spread rate (as a percent) 2.26% 2.21%
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, real estate | Minimum    
Unobservable inputs    
Discount rate (as a percent) 5.60% 6.00%
Terminal capitalization rate (as a percent) 4.30% 4.50%
Average market rent growth rate (as a percent) 0.00% 1.30%
Fair value hierarchy Level 3 | Separate account assets | Discounted cash flow, real estate | Maximum    
Unobservable inputs    
Discount rate (as a percent) 38.10% 24.60%
Terminal capitalization rate (as a percent) 9.50% 9.50%
Average market rent growth rate (as a percent) 4.40% 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) 7.30% 7.40%
Terminal capitalization rate (as a percent) 6.20% 6.40%
Average market rent growth rate (as a percent) 3.10% 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) 15.30% 6.80%
Credit spread rate (as a percent) 1.60% 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) 65.20% 64.10%
Credit spread rate (as a percent) 4.30% 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) 45.80% 46.50%
Credit spread rate (as a percent) 2.30% 3.40%
Fair value hierarchy Level 3 | Investment-type insurance contracts | Discounted cash flow    
Unobservable inputs    
Liabilities measured at fair value $ (210.3) $ (176.4)
Fair value hierarchy Level 3 | Investment-type insurance contracts | Discounted cash flow | Minimum    
Unobservable inputs    
Long duration interest rate (as a percent) 2.40% 2.60%
Long-term equity market volatility (as a percent) 14.90% 14.90%
Non-performance risk (as a percent) 0.50% 0.10%
Lapse rate (as a percent) 0.50% 0.50%
Fair value hierarchy Level 3 | Investment-type insurance contracts | Discounted cash flow | Maximum    
Unobservable inputs    
Long duration interest rate (as a percent) 2.50% 2.70%
Long-term equity market volatility (as a percent) 44.90% 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)