v3.26.3
Fair Value Measurements - Financial Instruments Not Reported at Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Assets (liabilities)    
Mortgage loans $ 20,425.1 $ 21,008.3
Policy loans 863.2 866.7
Reinsurance deposit receivable 3,509.3 4,076.2
Short-term debt (177.6) (27.7)
Long-term debt (4,326.2) (3,926.3)
Carrying amount    
Assets (liabilities)    
Mortgage loans 20,425.1 21,008.3
Policy loans 863.2 866.7
Other investments 218.3 265.7
Cash and cash equivalents not required to be reported at fair value 1,770.0 1,194.9
Reinsurance deposit receivable 3,509.3 4,076.2
Cash collateral receivable 0.7 5.4
Investment contracts (34,827.0) (34,139.0)
Short-term debt (177.6) (27.7)
Long-term debt (4,326.2) (3,926.3)
Separate account liabilities (180,056.2) (178,620.2)
Bank deposits (382.5) (423.8)
Cash collateral payable (1,393.0) (857.6)
Assets (liabilities) measured at fair value    
Assets (liabilities)    
Mortgage loans 18,572.8 19,800.9
Policy loans 840.7 906.0
Other investments 205.3 255.4
Cash and cash equivalents not required to be reported at fair value 1,770.0 1,194.9
Reinsurance deposit receivable 3,249.2 3,825.7
Cash collateral receivable 0.7 5.4
Investment contracts (33,711.7) (33,655.5)
Short-term debt (177.6) (27.7)
Long-term debt (4,144.6) (3,833.5)
Separate account liabilities (138,929.9) (177,621.6)
Bank deposits (383.9) (427.8)
Cash collateral payable (1,393.0) (857.6)
Assets (liabilities) measured at fair value | Fair value hierarchy Level 1    
Assets (liabilities)    
Cash and cash equivalents not required to be reported at fair value 1,746.5 1,181.0
Cash collateral receivable 0.7 5.4
Cash collateral payable (1,393.0) (857.6)
Assets (liabilities) measured at fair value | Fair value hierarchy Level 2    
Assets (liabilities)    
Other investments 34.7 77.6
Cash and cash equivalents not required to be reported at fair value 23.5 13.9
Investment contracts (8,064.8) (8,200.1)
Short-term debt (177.6) (27.7)
Long-term debt (3,968.3) (3,830.9)
Bank deposits (383.9) (427.8)
Assets (liabilities) measured at fair value | Fair value hierarchy Level 3    
Assets (liabilities)    
Mortgage loans 18,572.8 19,800.9
Policy loans 840.7 906.0
Other investments 170.6 177.8
Reinsurance deposit receivable 3,249.2 3,825.7
Investment contracts (25,646.9) (25,455.4)
Long-term debt (176.3) (2.6)
Separate account liabilities $ (138,929.9) $ (177,621.6)