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Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss)        
Balance at Beginning of Period $ (2,040.7) $ (2,846.2) $ (2,523.7) $ (3,308.0)
Other Comprehensive Income (Loss) Before Reclassifications (29.4) 109.6 268.4 552.8
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss (97.2) 6.9 88.0 25.5
Net Other Comprehensive Income (126.6) 116.5 356.4 578.3
Balance at End of Period (2,167.3) (2,729.7) (2,167.3) (2,729.7)
Net Unrealized Loss on Securities        
Accumulated Other Comprehensive Income (Loss)        
Balance at Beginning of Period (2,253.7) (2,723.8) (2,755.2) (1,919.1)
Other Comprehensive Income (Loss) Before Reclassifications 375.8 1,225.8 695.0 401.1
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss (100.3) 6.8 82.0 26.8
Net Other Comprehensive Income 275.5 1,232.6 777.0 427.9
Balance at End of Period (1,978.2) (1,491.2) (1,978.2) (1,491.2)
Effect of Change in Discount Rate Assumptions on the LFPB        
Accumulated Other Comprehensive Income (Loss)        
Balance at Beginning of Period 1,058.9 712.3 1,185.4 (648.4)
Other Comprehensive Income (Loss) Before Reclassifications (402.3) (1,239.3) (528.8) 121.4
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss 0.0 0.0 0.0 0.0
Net Other Comprehensive Income (402.3) (1,239.3) (528.8) 121.4
Balance at End of Period 656.6 (527.0) 656.6 (527.0)
Net Loss on Derivatives        
Accumulated Other Comprehensive Income (Loss)        
Balance at Beginning of Period (285.0) (164.6) (270.7) (73.7)
Other Comprehensive Income (Loss) Before Reclassifications 20.9 58.8 10.1 (24.3)
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss (0.1) (3.1) (3.6) (10.9)
Net Other Comprehensive Income 20.8 55.7 6.5 (35.2)
Balance at End of Period (264.2) (108.9) (264.2) (108.9)
Foreign Currency Translation Adjustment        
Accumulated Other Comprehensive Income (Loss)        
Balance at Beginning of Period (220.7) (328.4) (343.0) (321.1)
Other Comprehensive Income (Loss) Before Reclassifications (25.4) 68.5 96.9 61.2
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss 0.0 0.0 0.0 0.0
Net Other Comprehensive Income (25.4) 68.5 96.9 61.2
Balance at End of Period (246.1) (259.9) (246.1) (259.9)
Unrecognized Pension and Postretirement Benefit Costs        
Accumulated Other Comprehensive Income (Loss)        
Balance at Beginning of Period (340.2) (341.7) (340.2) (345.7)
Other Comprehensive Income (Loss) Before Reclassifications 1.6 (4.2) (4.8) (6.6)
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss 3.2 3.2 9.6 9.6
Net Other Comprehensive Income 4.8 (1.0) 4.8 3.0
Balance at End of Period $ (335.4) $ (342.7) $ (335.4) $ (342.7)