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Fair Value Measurements - Financial Assets Measured on Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Catastrophe bonds trading, at fair value $ 28.3 $ 42.5  
Derivatives at fair value 22.1 7.2  
Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Catastrophe bonds trading, at fair value 28.3    
Loan notes issued by variable interest entities, at fair value (110.8) (115.0)  
Loan notes issued by variable interest entities, at fair value (included within accrued expenses and other payables) (4.7) (108.4)  
Total (7,555.4) (7,653.6)  
Fair Value, Measurements, Recurring | Short-term investments trading, at fair value      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 73.7 185.4  
Fair Value, Measurements, Recurring | Equity investments trading, at fair value      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 658.7 584.7  
Fair Value, Measurements, Recurring | Derivatives at fair value, assets | Foreign Exchange Contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivatives at fair value 22.1 7.2  
Fair Value, Measurements, Recurring | Liabilities under derivative contracts — foreign exchange contracts | Foreign Exchange Contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Liabilities under derivative contracts, fair value (8.6) (18.4)  
Available for sale financial assets | Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 5,497.3 5,664.6  
Available for sale financial assets | Fair Value, Measurements, Recurring | U.S. government      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 1,220.8 1,206.1  
Available for sale financial assets | Fair Value, Measurements, Recurring | U.S. agency      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 75.5 119.6  
Available for sale financial assets | Fair Value, Measurements, Recurring | Municipal      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 32.8 24.4  
Available for sale financial assets | Fair Value, Measurements, Recurring | Corporate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 2,503.4 2,586.5  
Available for sale financial assets | Fair Value, Measurements, Recurring | Non-U.S. government-backed corporate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 92.6 89.8  
Available for sale financial assets | Fair Value, Measurements, Recurring | Non-U.S. government      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 525.9 488.7  
Available for sale financial assets | Fair Value, Measurements, Recurring | Asset-backed      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 48.9 63.0  
Available for sale financial assets | Fair Value, Measurements, Recurring | Non-agency commercial mortgage-backed      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 4.3 12.6  
Available for sale financial assets | Fair Value, Measurements, Recurring | Agency mortgage-backed      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 993.1 1,073.9  
Short-term investments | Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 41.9 145.3  
Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 1,357.5 1,265.7  
Catastrophe bonds trading, at fair value   42.5  
Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | U.S. government      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 112.8 82.4  
Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | U.S. agency      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0    
Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | Municipal      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 5.7 15.5  
Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | Corporate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 895.9 820.6  
Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | Non-U.S. government-backed corporate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 2.0    
Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | Non-U.S. government      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 186.5 202.8  
Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | Asset-backed      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 12.2 14.5  
Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | Agency mortgage-backed      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 142.4 129.9  
Level 1 | Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Catastrophe bonds trading, at fair value 0.0    
Loan notes issued by variable interest entities, at fair value 0.0 0.0  
Loan notes issued by variable interest entities, at fair value (included within accrued expenses and other payables) 0.0 0.0  
Total (2,479.1) (2,411.6)  
Level 1 | Fair Value, Measurements, Recurring | Short-term investments trading, at fair value      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 73.5 76.1  
Level 1 | Fair Value, Measurements, Recurring | Equity investments trading, at fair value      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 658.7 584.7  
Level 1 | Fair Value, Measurements, Recurring | Derivatives at fair value, assets | Foreign Exchange Contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivatives at fair value 0.0 0.0  
Level 1 | Fair Value, Measurements, Recurring | Liabilities under derivative contracts — foreign exchange contracts | Foreign Exchange Contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Liabilities under derivative contracts, fair value 0.0 0.0  
Level 1 | Available for sale financial assets | Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 1,594.3 1,549.8  
Level 1 | Available for sale financial assets | Fair Value, Measurements, Recurring | U.S. government      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 1,220.8 1,206.1  
Level 1 | Available for sale financial assets | Fair Value, Measurements, Recurring | U.S. agency      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 1 | Available for sale financial assets | Fair Value, Measurements, Recurring | Municipal      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 1 | Available for sale financial assets | Fair Value, Measurements, Recurring | Corporate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 1 | Available for sale financial assets | Fair Value, Measurements, Recurring | Non-U.S. government-backed corporate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 1 | Available for sale financial assets | Fair Value, Measurements, Recurring | Non-U.S. government      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 373.5 343.7  
Level 1 | Available for sale financial assets | Fair Value, Measurements, Recurring | Asset-backed      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 1 | Available for sale financial assets | Fair Value, Measurements, Recurring | Non-agency commercial mortgage-backed      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 1 | Available for sale financial assets | Fair Value, Measurements, Recurring | Agency mortgage-backed      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 1 | Short-term investments | Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 38.1 118.6  
Level 1 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 114.5 82.4  
Catastrophe bonds trading, at fair value   0.0  
Level 1 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | U.S. government      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 112.8 82.4  
Level 1 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | U.S. agency      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0    
Level 1 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | Municipal      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 1 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | Corporate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 1 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | Non-U.S. government-backed corporate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0    
Level 1 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | Non-U.S. government      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 1.7 0.0  
Level 1 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | Asset-backed      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 1 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | Agency mortgage-backed      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 2 | Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Catastrophe bonds trading, at fair value 28.3    
Loan notes issued by variable interest entities, at fair value 0.0 0.0  
Loan notes issued by variable interest entities, at fair value (included within accrued expenses and other payables) 0.0 0.0  
Total (5,191.8) (5,465.4)  
Level 2 | Fair Value, Measurements, Recurring | Short-term investments trading, at fair value      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.2 109.3  
Level 2 | Fair Value, Measurements, Recurring | Equity investments trading, at fair value      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 2 | Fair Value, Measurements, Recurring | Derivatives at fair value, assets | Foreign Exchange Contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivatives at fair value 22.1 7.2  
Level 2 | Fair Value, Measurements, Recurring | Liabilities under derivative contracts — foreign exchange contracts | Foreign Exchange Contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Liabilities under derivative contracts, fair value (8.6) (18.4)  
Level 2 | Available for sale financial assets | Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 3,903.0 4,114.8  
Level 2 | Available for sale financial assets | Fair Value, Measurements, Recurring | U.S. government      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 2 | Available for sale financial assets | Fair Value, Measurements, Recurring | U.S. agency      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 75.5 119.6  
Level 2 | Available for sale financial assets | Fair Value, Measurements, Recurring | Municipal      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 32.8 24.4  
Level 2 | Available for sale financial assets | Fair Value, Measurements, Recurring | Corporate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 2,503.4 2,586.5  
Level 2 | Available for sale financial assets | Fair Value, Measurements, Recurring | Non-U.S. government-backed corporate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 92.6 89.8  
Level 2 | Available for sale financial assets | Fair Value, Measurements, Recurring | Non-U.S. government      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 152.4 145.0  
Level 2 | Available for sale financial assets | Fair Value, Measurements, Recurring | Asset-backed      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 48.9 63.0  
Level 2 | Available for sale financial assets | Fair Value, Measurements, Recurring | Non-agency commercial mortgage-backed      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 4.3 12.6  
Level 2 | Available for sale financial assets | Fair Value, Measurements, Recurring | Agency mortgage-backed      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 993.1 1,073.9  
Level 2 | Short-term investments | Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 3.8 26.7  
Level 2 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 1,243.0 1,183.3  
Catastrophe bonds trading, at fair value   42.5  
Level 2 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | U.S. government      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 2 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | U.S. agency      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0    
Level 2 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | Municipal      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 5.7 15.5  
Level 2 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | Corporate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 895.9 820.6  
Level 2 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | Non-U.S. government-backed corporate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 2.0    
Level 2 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | Non-U.S. government      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 184.8 202.8  
Level 2 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | Asset-backed      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 12.2 14.5  
Level 2 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | Agency mortgage-backed      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 142.4 129.9  
Level 3 | Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Catastrophe bonds trading, at fair value 0.0    
Loan notes issued by variable interest entities, at fair value (110.8) (115.0)  
Loan notes issued by variable interest entities, at fair value (included within accrued expenses and other payables) (4.7) (108.4) $ (1.4)
Total (115.5) (223.4)  
Level 3 | Fair Value, Measurements, Recurring | Short-term investments trading, at fair value      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 3 | Fair Value, Measurements, Recurring | Equity investments trading, at fair value      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 3 | Fair Value, Measurements, Recurring | Derivatives at fair value, assets | Foreign Exchange Contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivatives at fair value 0.0 0.0  
Level 3 | Fair Value, Measurements, Recurring | Liabilities under derivative contracts — foreign exchange contracts | Foreign Exchange Contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Liabilities under derivative contracts, fair value 0.0 0.0  
Level 3 | Available for sale financial assets | Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 3 | Available for sale financial assets | Fair Value, Measurements, Recurring | U.S. government      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 3 | Available for sale financial assets | Fair Value, Measurements, Recurring | U.S. agency      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 3 | Available for sale financial assets | Fair Value, Measurements, Recurring | Municipal      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 3 | Available for sale financial assets | Fair Value, Measurements, Recurring | Corporate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 3 | Available for sale financial assets | Fair Value, Measurements, Recurring | Non-U.S. government-backed corporate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 3 | Available for sale financial assets | Fair Value, Measurements, Recurring | Non-U.S. government      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 3 | Available for sale financial assets | Fair Value, Measurements, Recurring | Asset-backed      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 3 | Available for sale financial assets | Fair Value, Measurements, Recurring | Non-agency commercial mortgage-backed      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 3 | Available for sale financial assets | Fair Value, Measurements, Recurring | Agency mortgage-backed      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 3 | Short-term investments | Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 3 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Catastrophe bonds trading, at fair value   0.0  
Level 3 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | U.S. government      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 3 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | U.S. agency      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0    
Level 3 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | Municipal      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 3 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | Corporate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 3 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | Non-U.S. government-backed corporate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0    
Level 3 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | Non-U.S. government      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 3 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | Asset-backed      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value 0.0 0.0  
Level 3 | Held for trading financial assets, at fair value | Fair Value, Measurements, Recurring | Agency mortgage-backed      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, at fair value $ 0.0 $ 0.0