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Derivative Financial Instruments - Notional Amounts and Credit Exposure (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Derivative Financial Instruments, exposure    
Cash and securities posted under collateral arrangements associated with derivative credit support agreements and Futures Commission Merchant agreements $ 271.6 $ 106.6
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position 164.7 109.7
Collateral and initial margin posted supporting derivatives with credit-risk-related contingent features that were in a liability position 271.6 106.6
Additional collateral required to be posted if derivative credit-risk-related contingent features were triggered 42.6  
Cash collateral received associated with derivative credit support annex agreements and Futures Commission Merchant agreements 156.8 79.5
Notional amount 50,868.2 49,954.5
Gross credit exposure 301.6 197.7
Less: collateral received 208.3 122.9
Net credit exposure 93.3 74.8
Interest rate swaps    
Derivative Financial Instruments, exposure    
Cash exchanged under contract 0.0  
Principal payments made under contract 0.0  
Notional amount 35,173.6 34,393.7
Gross credit exposure 181.9 95.4
Interest rate options    
Derivative Financial Instruments, exposure    
Notional amount 1,416.9 1,126.9
Gross credit exposure 28.3 16.3
Interest rate futures    
Derivative Financial Instruments, exposure    
Notional amount 142.5 260.0
Swaptions    
Derivative Financial Instruments, exposure    
Notional amount 62.0  
Currency forwards    
Derivative Financial Instruments, exposure    
Notional amount 1,262.6 863.6
Gross credit exposure 4.9 2.8
Currency swaps    
Derivative Financial Instruments, exposure    
Notional amount 1,027.2 898.6
Gross credit exposure 55.4 71.2
Currency options    
Derivative Financial Instruments, exposure    
Notional amount 53.8 525.2
Gross credit exposure 0.1 1.9
Equity options    
Derivative Financial Instruments, exposure    
Notional amount 1,672.8 1,522.5
Gross credit exposure 30.5 7.7
Equity futures    
Derivative Financial Instruments, exposure    
Notional amount 149.5 491.7
Credit default swaps    
Derivative Financial Instruments, exposure    
Notional amount 165.0 420.0
Gross credit exposure 0.5 2.4
Embedded derivative financial instruments    
Derivative Financial Instruments, exposure    
Notional amount $ 9,742.3 $ 9,452.3