v3.25.1
Investments Schedule of Financial Instrument and Derivative Offsetting (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Offsetting Derivative Assets [Abstract]    
Net Derivative Assets Reported in Balance Sheet $ 100.0 $ 90.9
Offsetting Securities Loaned    
Gross Securities Loaned 61.8 94.0
Assets Offsetting Securities Loaned in Balance Sheet 0.0 0.0
Net Securities Loaned Reported in Balance Sheet 61.8 94.0
Securities Given as Collateral on Securities Loaned (16.6) (31.3)
Cash Given as Collateral on Securities Loaned (45.2) (62.7)
Securities Loaned, Amount Offset Against Collateral 0.0 0.0
Offsetting Financial Assets    
Gross Financial Assets 152.2 173.4
Financial Liabilities Offsetting Financial Assets in Balance Sheet 0.0 0.0
Net Financial Assets Reported in Balance Sheet 152.2 173.4
Securities Received as Collateral on Financial Assets (104.3) (107.0)
Cash Received as Collateral on Financial Assets (46.6) (65.9)
Financial Assets Net of Collateral 1.3 0.5
Offsetting Derivative Liabilities    
Net Derivative Liabilities Reported in Balance Sheet 220.4 255.7
Offsetting Securities Borrowed    
Gross Securities Borrowed 45.2 62.7
Liabilities Offsetting Securities Borrowed in Balance Sheet 0.0 0.0
Net Securities Borrowed Reported in Balance Sheet 45.2 62.7
Securities Received as Collateral on Securities Borrowed (45.2) (62.7)
Cash Received as Collateral on Securities Borrowed 0.0 0.0
Securities Borrowed Net of Collateral 0.0 0.0
Offsetting Financial Liabilities    
Gross Financial Liability 265.6 318.4
Financial Assets Offsetting Financial Liabilities in Balance Sheet 0.0 0.0
Net Financial Liabilities Reported in Balance Sheet 265.6 318.4
Securities Given as Collateral on Financial Liabilities (265.4) (317.0)
Cash Given as Collateral on Financial Liabilities 0.0 0.0
Financial Liabilities Net of Collateral 0.2 1.4
Over the Counter    
Offsetting Derivative Assets [Abstract]    
Derivative Asset, Fair Value, Gross Asset 90.4 79.4
Derivative Liabilities Offsetting Derivative Assets in Balance Sheet 0.0 0.0
Net Derivative Assets Reported in Balance Sheet 90.4 79.4
Securities Received as Collateral on Derivative Assets (87.7) (75.7)
Cash Collateral from Counterparties (1.4) (3.2)
Derivative Assets Net of Collateral 1.3 0.5
Offsetting Derivative Liabilities    
Gross Derivative Liability 220.4 255.7
Derivative Assets Offsetting Derivative Liabilities in Balance Sheet 0.0 0.0
Net Derivative Liabilities Reported in Balance Sheet 220.4 255.7
Securities Given as Collateral on Derivative Liabilities (220.2) (254.3)
Cash Collateral to counterparties 0.0 0.0
Derivative Liabilities Net of Collateral $ 0.2 $ 1.4