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Deferred Policy Acquisition Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Movement Analysis of Deferred Policy Acquisition Costs        
Deferred Acquisition Costs at Beginning of Year     $ 2,842.8  
Deferred Policy Acquisition Costs, Amortization Expense $ (132.3) $ (133.8) (389.9) $ (387.9)
Deferred Acquisition Costs at End of Period 2,880.4   2,880.4  
Operating Segments        
Movement Analysis of Deferred Policy Acquisition Costs        
Deferred Acquisition Costs at Beginning of Year     2,842.8 2,714.5
Deferred Policy Acquisition Cost     521.0 495.3
Deferred Policy Acquisition Costs, Amortization Expense (132.3) (133.8) (389.9) (387.9)
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment and Other     6.8 1.6
Deferred Acquisition Costs at End of Period 2,880.4 2,823.5 2,880.4 2,823.5
Operating Segments | Long-term Care and Individual Disability Reinsurance Transaction        
Movement Analysis of Deferred Policy Acquisition Costs        
Change in Deferred Acquisition Costs [1]     (100.3)  
Unum US        
Movement Analysis of Deferred Policy Acquisition Costs        
Deferred Acquisition Costs at Beginning of Year     1,260.6 1,232.2
Deferred Policy Acquisition Cost     253.7 247.4
Deferred Policy Acquisition Costs, Amortization Expense     (208.2) (216.7)
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment and Other     0.0 0.0
Deferred Acquisition Costs at End of Period 1,205.8 1,262.9 1,205.8 1,262.9
Unum US | Long-term Care and Individual Disability Reinsurance Transaction        
Movement Analysis of Deferred Policy Acquisition Costs        
Change in Deferred Acquisition Costs [1]     (100.3)  
Unum US | Group Disability        
Movement Analysis of Deferred Policy Acquisition Costs        
Deferred Acquisition Costs at Beginning of Year     61.1 63.6
Deferred Policy Acquisition Cost     46.5 48.1
Deferred Policy Acquisition Costs, Amortization Expense     (41.5) (46.8)
Deferred Acquisition Costs at End of Period 66.1 64.9 66.1 64.9
Unum US | Group Life and AD&D        
Movement Analysis of Deferred Policy Acquisition Costs        
Deferred Acquisition Costs at Beginning of Year     51.1 48.9
Deferred Policy Acquisition Cost     34.7 31.0
Deferred Policy Acquisition Costs, Amortization Expense     (26.4) (26.7)
Deferred Acquisition Costs at End of Period 59.4 53.2 59.4 53.2
Unum US | Voluntary Benefits        
Movement Analysis of Deferred Policy Acquisition Costs        
Deferred Acquisition Costs at Beginning of Year     614.3 610.6
Deferred Policy Acquisition Cost     93.9 93.2
Deferred Policy Acquisition Costs, Amortization Expense     (86.0) (88.4)
Deferred Acquisition Costs at End of Period 622.2 615.4 622.2 615.4
Unum US | Individual Disability        
Movement Analysis of Deferred Policy Acquisition Costs        
Deferred Acquisition Costs at Beginning of Year     521.2 497.8
Deferred Policy Acquisition Cost     67.2 63.9
Deferred Policy Acquisition Costs, Amortization Expense     (43.5) (45.3)
Deferred Acquisition Costs at End of Period 444.6 516.4 444.6 516.4
Unum US | Individual Disability | Long-term Care and Individual Disability Reinsurance Transaction        
Movement Analysis of Deferred Policy Acquisition Costs        
Change in Deferred Acquisition Costs (100.3)   (100.3) [1]  
Unum US | Dental and Vision        
Movement Analysis of Deferred Policy Acquisition Costs        
Deferred Acquisition Costs at Beginning of Year     12.9 11.3
Deferred Policy Acquisition Cost     11.4 11.2
Deferred Policy Acquisition Costs, Amortization Expense     (10.8) (9.5)
Deferred Acquisition Costs at End of Period 13.5 13.0 13.5 13.0
Unum US | Operating Segments        
Movement Analysis of Deferred Policy Acquisition Costs        
Deferred Policy Acquisition Costs, Amortization Expense (71.4) (75.7) (208.2) (216.7)
Unum International        
Movement Analysis of Deferred Policy Acquisition Costs        
Deferred Acquisition Costs at Beginning of Year     53.0 46.9
Deferred Policy Acquisition Cost     16.4 13.2
Deferred Policy Acquisition Costs, Amortization Expense     (7.8) (7.3)
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment and Other     6.8 1.6
Deferred Acquisition Costs at End of Period 68.4 54.4 68.4 54.4
Unum International | Operating Segments        
Movement Analysis of Deferred Policy Acquisition Costs        
Deferred Policy Acquisition Costs, Amortization Expense (2.7) (2.5) (7.8) (7.3)
Colonial Life        
Movement Analysis of Deferred Policy Acquisition Costs        
Deferred Acquisition Costs at Beginning of Year     1,529.2 1,435.4
Deferred Policy Acquisition Cost     250.9 234.7
Deferred Policy Acquisition Costs, Amortization Expense     (173.9) (163.9)
Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment and Other     0.0 0.0
Deferred Acquisition Costs at End of Period 1,606.2 1,506.2 1,606.2 1,506.2
Colonial Life | Operating Segments        
Movement Analysis of Deferred Policy Acquisition Costs        
Deferred Policy Acquisition Costs, Amortization Expense $ (58.2) $ (55.6) $ (173.9) $ (163.9)
[1]
1Reflects the impacts of DAC written off related to the Fortitude Re reinsurance transaction. See Note 14 for further discussion of the reinsurance transaction.