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Investments Schedule of Financial Instrument and Derivative Offsetting (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Offsetting Derivative Assets    
Net Derivative Assets Reported in Balance Sheet $ 70.5 $ 90.9
Offsetting Securities Loaned    
Gross Securities Loaned 129.8 94.0
Assets Offsetting Securities Loaned in Balance Sheet 0.0 0.0
Net Securities Loaned Reported in Balance Sheet 129.8 94.0
Securities Given as Collateral on Securities Loaned (20.8) (31.3)
Cash Given as Collateral on Securities Loaned (109.0) (62.7)
Securities Loaned Net of Collateral 0.0 0.0
Offsetting Financial Assets    
Gross Financial Assets 186.4 173.4
Financial Liabilities Offsetting Financial Assets in Balance Sheet 0.0 0.0
Net Financial Assets Reported in Balance Sheet 186.4 173.4
Securities Received as Collateral on Financial Assets (77.4) (107.0)
Cash Received as Collateral on Financial Assets (109.0) (65.9)
Financial Assets Net of Collateral 0.0 0.5
Offsetting Derivative Liabilities    
Net Derivative Liabilities Reported in Balance Sheet 259.6 255.7
Offsetting Securities Borrowed    
Gross Securities Borrowed 109.0 62.7
Liabilities Offsetting Securities Borrowed in Balance Sheet 0.0 0.0
Net Securities Borrowed Reported in Balance Sheet 109.0 62.7
Securities Received as Collateral on Securities Borrowed (109.0) (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 368.6 318.4
Financial Assets Offsetting Financial Liabilities in Balance Sheet 0.0 0.0
Net Financial Liabilities Reported in Balance Sheet 368.6 318.4
Securities Given as Collateral on Financial Liabilities (367.5) (317.0)
Cash Given as Collateral on Financial Liabilities 0.0 0.0
Financial Liabilities Net of Collateral 1.1 1.4
Over the Counter    
Offsetting Derivative Assets    
Derivative Asset, Fair Value, Gross Asset 56.6 79.4
Derivative Liabilities Offsetting Derivative Assets in Balance Sheet 0.0 0.0
Net Derivative Assets Reported in Balance Sheet 56.6 79.4
Securities Received as Collateral on Derivative Assets (56.6) (75.7)
Cash Collateral from Counterparties 0.0 (3.2)
Derivative Assets Net of Collateral 0.0 0.5
Offsetting Derivative Liabilities    
Gross Derivative Liability 259.6 255.7
Derivative Assets Offsetting Derivative Liabilities in Balance Sheet 0.0 0.0
Net Derivative Liabilities Reported in Balance Sheet 259.6 255.7
Securities Given as Collateral on Derivative Liabilities (258.5) (254.3)
Cash Collateral to counterparties 0.0 0.0
Derivative Liabilities Net of Collateral $ 1.1 $ 1.4