v3.26.1
Fair Value Measurements - Financial Instruments Not Reported at Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Assets (liabilities)    
Mortgage loans $ 21,092.7 $ 21,008.3
Policy loans 875.5 866.7
Reinsurance deposit receivable 3,676.6 4,076.2
Short-term debt (16.2) (27.7)
Long-term debt (4,324.4) (3,926.3)
Carrying amount    
Assets (liabilities)    
Mortgage loans 21,092.7 21,008.3
Policy loans 875.5 866.7
Other investments 268.9 265.7
Cash and cash equivalents not required to be reported at fair value 1,739.7 1,194.9
Reinsurance deposit receivable 3,676.6 4,076.2
Cash collateral receivable 0.8 5.4
Investment contracts (34,746.3) (34,139.0)
Short-term debt (16.2) (27.7)
Long-term debt (4,324.4) (3,926.3)
Separate account liabilities (187,074.5) (178,620.2)
Bank deposits (391.5) (423.8)
Cash collateral payable (1,295.0) (857.6)
Assets (liabilities) measured at fair value    
Assets (liabilities)    
Mortgage loans 19,712.9 19,800.9
Policy loans 903.2 906.0
Other investments 248.0 255.4
Cash and cash equivalents not required to be reported at fair value 1,739.7 1,194.9
Reinsurance deposit receivable 3,431.9 3,825.7
Cash collateral receivable 0.8 5.4
Investment contracts (34,062.3) (33,655.5)
Short-term debt (16.2) (27.7)
Long-term debt (4,182.5) (3,833.5)
Separate account liabilities (142,768.2) (177,621.6)
Bank deposits (393.4) (427.8)
Cash collateral payable (1,295.0) (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 1,718.6 1,181.0
Cash collateral receivable 0.8 5.4
Cash collateral payable (1,295.0) (857.6)
Assets (liabilities) measured at fair value | Fair value hierarchy Level 2    
Assets (liabilities)    
Other investments 83.3 77.6
Cash and cash equivalents not required to be reported at fair value 21.1 13.9
Investment contracts (8,316.9) (8,200.1)
Short-term debt (16.2) (27.7)
Long-term debt (4,180.0) (3,830.9)
Bank deposits (393.4) (427.8)
Assets (liabilities) measured at fair value | Fair value hierarchy Level 3    
Assets (liabilities)    
Mortgage loans 19,712.9 19,800.9
Policy loans 903.2 906.0
Other investments 164.7 177.8
Reinsurance deposit receivable 3,431.9 3,825.7
Investment contracts (25,745.4) (25,455.4)
Long-term debt (2.5) (2.6)
Separate account liabilities $ (142,768.2) $ (177,621.6)