Liability for Future Policy Benefit Activity (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2024		Jun. 30, 2023		Dec. 31, 2023	Dec. 31, 2022
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Future Policy Benefits		$ 37,899.4				$ 40,009.4
Operating Segments
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year		14,417.8		$ 12,426.2
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		14,243.2		12,695.3
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						0.0	$ 0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(147.4)	(118.1)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						14,095.8	12,577.2
Liability for Future Policy Benefit, Expected Net Premium, Issuance		633.9		514.4
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		323.6		275.7
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(834.1)		(774.1)
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change		(6.9)		20.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		14,212.3		12,613.2
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(249.3)		(153.3)
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		13,963.0		12,459.9
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year		52,423.6		48,929.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		51,305.7		49,689.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						0.0	0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(305.0)	(351.3)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						$ 51,000.7	$ 49,337.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance	[1]	1,878.2		1,837.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		1,148.2		1,104.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(2,872.3)		(2,888.7)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change		(26.4)		140.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		51,128.4		49,531.4
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(1,173.5)		(173.3)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		49,954.9		49,358.1
Liability for Future Policy Benefit, before Reinsurance, before Other		35,991.9		36,898.2
Liability for Future Policy Benefit, Other		1,671.8		1,806.7
Liability for Future Policy Benefit, before Reinsurance, after Other		37,663.7		38,704.9
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		7,315.3		7,922.9
Liability for Future Policy Benefit, after Reinsurance		30,348.4		30,782.0
Liability for Future Policy Benefit, Gross Premium Income		5,036.4		4,828.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		824.6		828.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		104,473.6		96,348.8
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		38,987.4		35,233.5
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 25,712.7		$ 23,774.0
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		4.90%		4.80%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.20%		5.00%		4.80%	5.00%
Liability for Future Policy Benefit, Weighted-Average Duration		11 years 4 months 24 days		10 years 9 months 18 days
Future Policy Benefits		$ 37,899.4		$ 38,945.3
Unum US
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year		2,431.4		2,071.1
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		2,486.9		2,166.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						$ 0.0	$ 0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(102.1)	(113.9)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						2,384.8	2,052.1
Liability for Future Policy Benefit, Expected Net Premium, Issuance		326.4		200.9
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		47.6		38.1
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(195.2)		(163.1)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		2,563.6		2,128.0
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(110.2)		(77.0)
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		2,453.4		2,051.0
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year		11,752.5		11,698.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		11,949.5		12,177.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						0.0	0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(288.7)	(355.1)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						11,660.8	11,822.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		1,305.5		1,240.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		223.3		234.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(1,368.7)		(1,422.7)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		11,820.9		11,874.2
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(485.1)		(372.7)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		11,335.8		11,501.5
Liability for Future Policy Benefit, before Reinsurance, before Other		8,882.4		9,450.5
Liability for Future Policy Benefit, Other		30.2		45.6
Liability for Future Policy Benefit, before Reinsurance, after Other		8,912.6		9,496.1
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		199.8		242.9
Liability for Future Policy Benefit, after Reinsurance		8,712.8		9,253.2
Liability for Future Policy Benefit, Gross Premium Income		3,268.1		3,105.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		175.7		195.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		17,844.5		17,520.9
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		11,527.9		9,495.3
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 8,007.3		$ 6,866.5
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		4.30%		4.10%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		4.90%		4.70%
Liability for Future Policy Benefit, Weighted-Average Duration		7 years		6 years 9 months 18 days
Future Policy Benefits	[2]	$ 8,912.6		$ 9,496.1
Unum International
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year		270.3		197.1
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		298.4		246.8
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						10.9	8.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						309.3	254.8
Liability for Future Policy Benefit, Expected Net Premium, Issuance		16.4		11.9
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		5.8		4.5
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(14.0)		(10.9)
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change		(6.9)		20.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		310.6		280.3
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(35.5)		(36.9)
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		275.1		243.4
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year		2,527.4		2,231.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		2,687.1		2,495.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						0.0	0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						6.4	7.8
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						2,693.5	2,503.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance	[3]	197.0		199.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		33.7		31.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(226.9)		(214.0)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change		(26.4)		140.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		2,670.9		2,661.6
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(256.9)		(336.5)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		2,414.0		2,325.1
Liability for Future Policy Benefit, before Reinsurance, before Other		2,138.9		2,081.7
Liability for Future Policy Benefit, Other		37.3		32.4
Liability for Future Policy Benefit, before Reinsurance, after Other		2,176.2		2,114.1
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		70.9		73.4
Liability for Future Policy Benefit, after Reinsurance		2,105.3		2,040.7
Liability for Future Policy Benefit, Gross Premium Income		460.5		436.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		27.9		27.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		4,259.1		4,189.4
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		1,266.3		1,092.4
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 816.0		$ 717.8
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		4.10%		4.00%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.20%		5.70%
Liability for Future Policy Benefit, Weighted-Average Duration		8 years 7 months 6 days		8 years 7 months 6 days
Future Policy Benefits		$ 2,176.2		$ 2,114.1
Colonial Life
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year		3,592.6		3,745.4
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		3,754.3		4,046.4
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(22.2)	(63.5)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						3,732.1	3,982.9
Liability for Future Policy Benefit, Expected Net Premium, Issuance		291.1		301.6
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		69.0		65.4
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(316.5)		(316.7)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		3,775.7		4,033.2
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(233.8)		(259.2)
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		3,541.9		3,774.0
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year		5,566.0		5,581.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		5,925.2		6,163.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change		0.0		0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(41.3)	(68.9)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						5,883.9	6,095.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		313.3		324.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		115.0		110.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(310.4)		(321.1)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		6,001.8		6,208.6
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(540.7)		(502.8)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		5,461.1		5,705.8
Liability for Future Policy Benefit, before Reinsurance, before Other		1,919.2		1,931.8
Liability for Future Policy Benefit, Other		24.4		19.6
Liability for Future Policy Benefit, before Reinsurance, after Other		1,943.6		1,951.4
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		1.8		1.0
Liability for Future Policy Benefit, after Reinsurance		1,941.8		1,950.4
Liability for Future Policy Benefit, Gross Premium Income		860.4		825.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		46.0		44.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		10,051.8		10,201.7
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		12,146.0		12,391.5
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 8,821.1		$ 9,018.7
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		4.30%		4.30%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.30%		5.10%
Liability for Future Policy Benefit, Weighted-Average Duration		16 years 10 months 24 days		17 years 3 months 18 days
Future Policy Benefits		$ 1,943.6		$ 1,951.4
Closed Block
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year		8,123.5		6,412.6
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		7,703.6		6,236.1
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(34.0)	51.3
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						7,669.6	6,287.4
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		201.2		167.7
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(308.4)		(283.4)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		7,562.4		6,171.7
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		130.2		219.8
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		7,692.6		6,391.5
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year		32,577.7		29,418.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		30,743.9		28,852.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						0.0	0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						18.6	64.9
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						30,762.5	28,917.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		62.4		72.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		776.2		728.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(966.3)		(930.9)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		30,634.8		28,787.0
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		109.2		1,038.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		30,744.0		29,825.7
Liability for Future Policy Benefit, before Reinsurance, before Other		23,051.4		23,434.2
Liability for Future Policy Benefit, Other		1,579.9		1,709.1
Liability for Future Policy Benefit, before Reinsurance, after Other		24,631.3		25,143.3
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		7,042.8		7,605.5
Liability for Future Policy Benefit, after Reinsurance		17,588.5		17,537.8
Liability for Future Policy Benefit, Gross Premium Income		447.4		461.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		575.0		560.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		72,318.2		64,436.8
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		14,047.2		12,254.3
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 8,068.3		$ 7,171.0
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		5.20%		5.20%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.40%		5.10%
Liability for Future Policy Benefit, Weighted-Average Duration		13 years 1 month 6 days		12 years 2 months 12 days
Future Policy Benefits	[2]	$ 24,631.3		$ 25,143.3
Other Products [Member]
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Future Policy Benefits	[2]	235.7		240.4
Group Disability | Unum US
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Issuance		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		0.0		0.0
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		0.0		0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year		5,147.4		5,533.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		5,277.1		5,793.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						0.0	0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(120.9)	(162.8)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						5,156.2	5,630.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		677.7	[4]	714.3	[5]
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		87.3		98.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(808.3)		(855.0)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		5,112.9		5,588.0
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(195.2)		(224.0)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		4,917.7		5,364.0
Liability for Future Policy Benefit, before Reinsurance, before Other		4,917.7		5,364.0
Liability for Future Policy Benefit, Other		0.2		0.3
Liability for Future Policy Benefit, before Reinsurance, after Other		4,917.9		5,364.3
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		26.6		33.7
Liability for Future Policy Benefit, after Reinsurance		4,891.3		5,330.6
Liability for Future Policy Benefit, Gross Premium Income		1,527.5		1,463.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		87.3		98.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		6,183.5		6,731.6
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		0.0		0.0
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 0.0		$ 0.0
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		4.10%		3.90%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.00%		4.90%
Liability for Future Policy Benefit, Weighted-Average Duration		4 years 2 months 12 days		4 years 3 months 18 days
Group Life and AD&D | Unum US
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year		$ 0.0		$ 0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Issuance		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		0.0		0.0
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		0.0		0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year		922.0		972.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		936.5		998.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						0.0	0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(38.0)	(25.4)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						898.5	973.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		283.1	[4]	311.7	[5]
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		10.2		11.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(305.7)		(349.1)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		886.1		946.8
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(21.7)		(23.5)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		864.4		923.3
Liability for Future Policy Benefit, before Reinsurance, before Other		864.4		923.3
Liability for Future Policy Benefit, Other		0.9		0.9
Liability for Future Policy Benefit, before Reinsurance, after Other		865.3		924.2
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		7.2		6.5
Liability for Future Policy Benefit, after Reinsurance		858.1		917.7
Liability for Future Policy Benefit, Gross Premium Income		995.0		930.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		10.2		11.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		1,008.6		1,077.4
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		0.0		0.0
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 0.0		$ 0.0
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		2.30%		2.20%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		2.80%		2.80%
Liability for Future Policy Benefit, Weighted-Average Duration		2 years 7 months 6 days		2 years 8 months 12 days
Individual Disability | Unum US
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year		$ 1,296.7		$ 1,202.9
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		1,294.4		1,228.1
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(16.4)	(22.4)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						1,278.0	1,205.7
Liability for Future Policy Benefit, Expected Net Premium, Issuance		77.5		98.3
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		27.6		24.4
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(96.5)		(89.0)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		1,286.6		1,239.4
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(26.5)		(20.2)
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		1,260.1		1,219.2
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year		3,348.6		3,192.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		3,313.9		3,244.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						0.0	0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(31.1)	(45.8)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						3,282.8	3,198.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		81.3		102.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		77.0		82.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(139.2)		(135.4)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		3,301.9		3,247.7
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(72.8)		(24.4)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		3,229.1		3,223.3
Liability for Future Policy Benefit, before Reinsurance, before Other		1,969.0		2,004.1
Liability for Future Policy Benefit, Other		26.4		27.0
Liability for Future Policy Benefit, before Reinsurance, after Other		1,995.4		2,031.1
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		152.6		190.7
Liability for Future Policy Benefit, after Reinsurance		1,842.8		1,840.4
Liability for Future Policy Benefit, Gross Premium Income		329.7		314.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		49.4		57.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		5,300.5		5,185.6
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		5,727.0		5,637.4
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 4,117.7		$ 4,045.8
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		5.10%		5.10%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.20%		5.00%
Liability for Future Policy Benefit, Weighted-Average Duration		9 years 7 months 6 days		9 years 6 months
Voluntary Benefits | Unum US
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year		$ 1,134.7		$ 868.2
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		1,192.5		937.9
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(85.7)	(91.5)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						1,106.8	846.4
Liability for Future Policy Benefit, Expected Net Premium, Issuance		248.9		102.6
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		20.0		13.7
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(98.7)		(74.1)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		1,277.0		888.6
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(83.7)		(56.8)
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		1,193.3		831.8
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year		2,334.5		1,999.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		2,422.0		2,141.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						0.0	0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(98.7)	(121.1)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						2,323.3	2,020.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		263.4		112.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		48.8		42.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(115.5)		(83.2)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		2,520.0		2,091.7
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(195.4)		(100.8)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		2,324.6		1,990.9
Liability for Future Policy Benefit, before Reinsurance, before Other		1,131.3		1,159.1
Liability for Future Policy Benefit, Other		2.7		17.4
Liability for Future Policy Benefit, before Reinsurance, after Other		1,134.0		1,176.5
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		13.4		12.0
Liability for Future Policy Benefit, after Reinsurance		1,120.6		1,164.5
Liability for Future Policy Benefit, Gross Premium Income		415.9		397.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		28.8		28.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		5,351.9		4,526.3
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		5,800.9		3,857.9
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 3,889.6		$ 2,820.7
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		5.00%		5.00%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.40%		5.00%
Liability for Future Policy Benefit, Weighted-Average Duration		18 years 1 month 6 days		17 years 8 months 12 days
Other Insurance Product Line | Closed Block
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year		$ 0.0		$ 0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		0.0		0.0
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		0.0		0.0
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		0.0		0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year		7,880.0		8,218.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		8,094.6		8,630.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						0.0	0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						7.1	(6.0)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						8,101.7	8,624.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		62.4	[6]	72.1	[7]
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		176.3		179.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(500.0)		(523.0)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		7,840.4		8,353.0
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(425.0)		(344.6)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		7,415.4		8,008.4
Liability for Future Policy Benefit, before Reinsurance, before Other		7,415.4		8,008.4
Liability for Future Policy Benefit, Other		1,554.7	[8]	1,684.6	[9]
Liability for Future Policy Benefit, before Reinsurance, after Other		8,970.1		9,693.0
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		7,038.6		7,600.1
Liability for Future Policy Benefit, after Reinsurance		1,931.5		2,092.9
Liability for Future Policy Benefit, Gross Premium Income		99.6		112.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		176.3		179.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		11,486.2		12,312.6
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		0.0		0.0
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 0.0		$ 0.0
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		4.60%		4.60%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.30%		5.10%
Liability for Future Policy Benefit, Weighted-Average Duration		7 years 2 months 12 days		7 years 3 months 18 days
Long-term Care | Closed Block
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year		$ 8,123.5		$ 6,412.6
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		7,703.6		6,236.1
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(34.0)	51.3
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						7,669.6	6,287.4
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		201.2		167.7
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(308.4)		(283.4)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		7,562.4		6,171.7
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		130.2		219.8
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		7,692.6		6,391.5
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year		24,697.7		21,199.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		22,649.3		20,221.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						0.0	0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						11.5	70.9
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						$ 22,660.8	$ 20,292.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		0.0		0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		599.9		549.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(466.3)		(407.9)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		22,794.4		20,434.0
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		534.2		1,383.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		23,328.6		21,817.3
Liability for Future Policy Benefit, before Reinsurance, before Other		15,636.0		15,425.8
Liability for Future Policy Benefit, Other		25.2		24.5
Liability for Future Policy Benefit, before Reinsurance, after Other		15,661.2		15,450.3
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		4.2		5.4
Liability for Future Policy Benefit, after Reinsurance		15,657.0		15,444.9
Liability for Future Policy Benefit, Gross Premium Income		347.8		349.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		398.7		381.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		60,832.0		52,124.2
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		14,047.2		12,254.3
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 8,068.3		$ 7,171.0
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		5.60%		5.60%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.40%		5.10%
Liability for Future Policy Benefit, Weighted-Average Duration		16 years 1 month 6 days		15 years 1 month 6 days
Liability for Future Policy Benefit, Adverse Development, Expense		$ (26.5)

[1] 1Issuances include new policy issuances for most product lines. For our Unum US group disability, Unum US group life and AD&D and Closed Block - All Other product lines and certain of our Unum International product lines, this line represents new claim incurrals.

[2] 1Unum US excludes dental & vision and medical stop-loss product lines and Closed Block excludes our participating fund account, which represents policies issued by one of our subsidiaries prior to its 1986 conversion from a mutual stock life insurance company. The liabilities associated with these products are included within Other products.

[3] 1Issuances for Unum International primarily represent new claim incurrals.

[4] 1Issuances include new policy issuances for most product lines. Issuances for Unum US group disability and Unum US group life and AD&D represents new claim incurrals.

[5] 1Issuances include new policy issuances for most product lines. Issuances for Unum US group disability and Unum US group life and AD&D represents new claim incurrals.

[6] 1Issuances for Closed Block - All Other represents new claim incurrals.

[7] 1Issuances for Closed Block - All Other represents new claim incurrals.

[8] 2Other for Closed Block - All Other primarily includes our closed block group pension products and certain of our ceded closed block individual life products.

[9] 2Other for Closed Block - All Other primarily includes our closed block group pension products and certain of our ceded closed block individual life products.