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Fair Value Measurements - Financial Assets Measured on Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Catastrophe Bonds, Fair Value Disclosure $ 5.3 $ 18.8
Derivatives at fair value 12.9 26.8
Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 6,512.6 5,767.6
Recurring | Derivatives at fair value | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives at fair value 12.9 26.8
Recurring | Liabilities under derivative contracts | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities under derivative contracts, fair value (13.3) (13.6)
Recurring | Total fixed income securities — Available for sale | Non-agency commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 6.9  
Recurring | Fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 4,881.6 4,348.1
Recurring | Short-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 10.1 87.8
Recurring | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 1,157.5 855.6
Privately-held Investments, at fair value 307.1 299.3
Catastrophe Bonds, Fair Value Disclosure 3.4 18.8
Recurring | Short-term investments trading at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 2.0 35.4
Recurring | Real estate fund    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 151.3 109.4
Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 1,384.5 1,563.5
Recurring | Level 1 | Derivatives at fair value | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives at fair value 0.0 0.0
Recurring | Level 1 | Liabilities under derivative 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
Recurring | Level 1 | Total fixed income securities — Available for sale | Non-agency commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0  
Recurring | Level 1 | Fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 1,248.7 1,285.4
Recurring | Level 1 | Short-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 6.5 81.0
Recurring | Level 1 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 128.2 161.7
Privately-held Investments, at fair value 0.0 0.0
Catastrophe Bonds, Fair Value Disclosure 0.0 0.0
Recurring | Level 1 | Short-term investments trading at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 1.1 35.4
Recurring | Level 1 | Real estate fund    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 4,669.7 3,795.4
Recurring | Level 2 | Derivatives at fair value | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives at fair value 12.9 26.8
Recurring | Level 2 | Liabilities under derivative contracts | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities under derivative contracts, fair value (13.3) (13.6)
Recurring | Level 2 | Total fixed income securities — Available for sale | Non-agency commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 6.9  
Recurring | Level 2 | Fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 3,632.9 3,062.7
Recurring | Level 2 | Short-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 3.6 6.8
Recurring | Level 2 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 1,029.3 693.9
Privately-held Investments, at fair value 0.0 0.0
Catastrophe Bonds, Fair Value Disclosure 3.4 18.8
Recurring | Level 2 | Short-term investments trading at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.9 0.0
Recurring | Level 2 | Real estate fund    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 307.1 299.3
Recurring | Level 3 | Derivatives at fair value | Foreign exchange contracts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives at fair value 0.0 0.0
Recurring | Level 3 | Liabilities under derivative 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
Recurring | Level 3 | Total fixed income securities — Available for sale | Non-agency commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0  
Recurring | Level 3 | Fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
Recurring | Level 3 | Short-term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
Recurring | Level 3 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
Privately-held Investments, at fair value 307.1 299.3
Catastrophe Bonds, Fair Value Disclosure 0.0 0.0
Recurring | Level 3 | Short-term investments trading at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
Recurring | Level 3 | Real estate fund    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
U.S. government | Recurring | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 1,084.3 1,101.2
U.S. government | Recurring | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 116.3 120.5
U.S. government | Recurring | Level 1 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 1,084.3 1,101.2
U.S. government | Recurring | Level 1 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 116.3 120.5
U.S. government | Recurring | Level 2 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
U.S. government | Recurring | Level 2 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
U.S. government | Recurring | Level 3 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
U.S. government | Recurring | Level 3 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
U.S. agency | Recurring | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 21.5 34.3
U.S. agency | Recurring | Level 1 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
U.S. agency | Recurring | Level 2 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 21.5 34.3
U.S. agency | Recurring | Level 3 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
Municipal | Recurring | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 82.6 67.1
Municipal | Recurring | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 4.0 3.5
Municipal | Recurring | Level 1 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
Municipal | Recurring | Level 1 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
Municipal | Recurring | Level 2 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 82.6 67.1
Municipal | Recurring | Level 2 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 4.0 3.5
Municipal | Recurring | Level 3 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
Municipal | Recurring | Level 3 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
Corporate | Recurring | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 2,208.3 273.1
Corporate | Recurring | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 96.8 103.5
Corporate | Recurring | Level 1 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 184.2
Corporate | Recurring | Level 1 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
Corporate | Recurring | Level 2 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 2,208.3 88.9
Corporate | Recurring | Level 2 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 96.8 103.5
Corporate | Recurring | Level 3 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
Corporate | Recurring | Level 3 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
Non-U.S. government-backed corporate | Recurring | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 136.8 63.4
Non-U.S. government-backed corporate | Recurring | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 13.1  
Non-U.S. government-backed corporate | Recurring | Level 1 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
Non-U.S. government-backed corporate | Recurring | Level 1 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0  
Non-U.S. government-backed corporate | Recurring | Level 2 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 136.8 63.4
Non-U.S. government-backed corporate | Recurring | Level 2 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 13.1  
Non-U.S. government-backed corporate | Recurring | Level 3 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
Non-U.S. government-backed corporate | Recurring | Level 3 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0  
Non-U.S government | Recurring | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 250.7 7.4
Non-U.S government | Recurring | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 34.5 41.6
Non-U.S government | Recurring | Level 1 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 164.4 0.0
Non-U.S government | Recurring | Level 1 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 11.9 41.2
Non-U.S government | Recurring | Level 2 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 86.3 7.4
Non-U.S government | Recurring | Level 2 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 22.6 0.4
Non-U.S government | Recurring | Level 3 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
Non-U.S government | Recurring | Level 3 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
Asset-backed | Recurring | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.5 973.1
Asset-backed | Recurring | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 785.7 539.1
Asset-backed | Recurring | Level 1 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
Asset-backed | Recurring | Level 1 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
Asset-backed | Recurring | Level 2 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.5 973.1
Asset-backed | Recurring | Level 2 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 785.7 539.1
Asset-backed | Recurring | Level 3 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
Asset-backed | Recurring | Level 3 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
Non-agency commercial mortgage-backed securities | Recurring | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value   2.3
Non-agency commercial mortgage-backed securities | Recurring | Level 1 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value   0.0
Non-agency commercial mortgage-backed securities | Recurring | Level 2 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value   2.3
Non-agency commercial mortgage-backed securities | Recurring | Level 3 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value   0.0
Agency mortgage-backed | Recurring | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 1,090.0 1,826.2
Agency mortgage-backed | Recurring | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 30.2 37.6
Agency mortgage-backed | Recurring | Level 1 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
Agency mortgage-backed | Recurring | Level 1 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
Agency mortgage-backed | Recurring | Level 2 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 1,090.0 1,826.2
Agency mortgage-backed | Recurring | Level 2 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 30.2 37.6
Agency mortgage-backed | Recurring | Level 3 | Total fixed income securities — Available for sale    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
Agency mortgage-backed | Recurring | Level 3 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
High yield loans | Recurring | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 76.9 9.8
High yield loans | Recurring | Level 1 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 0.0 0.0
High yield loans | Recurring | Level 2 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value 76.9 9.8
High yield loans | Recurring | Level 3 | Held for trading financial assets, at fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value $ 0.0 $ 0.0