Liability for Future Policy Benefit Activity (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2026		Sep. 30, 2025		Dec. 31, 2025	Dec. 31, 2024
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Future Policy Benefits		$ 35,144.6				$ 38,017.0
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		14,416.5		$ 13,930.6
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		14,393.0		14,266.9
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						(173.7)	$ 161.7
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(344.4)	(229.0)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						13,874.9	14,199.6
Liability for Future Policy Benefit, Expected Net Premium, Issuance		979.6		941.3
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		475.4		482.2
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(1,310.7)		(1,258.7)
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change		(26.4)		42.7
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		13,992.8		14,407.1
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(831.8)		65.1
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		13,161.0		14,472.2
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		50,683.1		48,920.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		51,638.5		50,778.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						(192.0)	715.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(165.2)	(292.3)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						$ 51,281.3	$ 51,201.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance	[1]	2,758.6		2,588.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		1,721.4		1,703.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(4,237.0)		(4,120.3)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change		(83.2)		228.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		51,441.1		51,602.2
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(4,751.4)		(565.1)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		46,689.7		51,037.1
Liability for Future Policy Benefit, before Reinsurance, before Other		33,528.7		36,564.9
Liability for Future Policy Benefit, Other	[2]	1,430.5		1,539.6
Liability for Future Policy Benefit, before Reinsurance, after Other		34,959.2		38,104.5
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		9,364.6		10,434.7
Liability for Future Policy Benefit, after Reinsurance		25,594.6		27,669.8
Liability for Future Policy Benefit, Gross Premium Income		8,280.0		7,866.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		1,246.0		1,221.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		100,828.6		102,872.2
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		38,585.8		39,457.2
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 25,728.5		$ 26,202.4
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		5.00%		4.90%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		6.00%		5.10%		5.10%	5.30%
Liability for Future Policy Benefit, Weighted-Average Duration		10 years 10 months 24 days		11 years 2 months 12 days
Future Policy Benefits		$ 35,144.6		$ 38,300.7
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		2,622.0		2,442.7
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		2,679.8		2,566.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						$ (148.4)	$ (86.5)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(34.6)	(84.9)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						2,496.8	2,394.6
Liability for Future Policy Benefit, Expected Net Premium, Issuance		516.3		487.8
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		75.8		72.5
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(330.4)		(298.0)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		2,758.5		2,656.9
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(191.4)		(49.4)
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		2,567.1		2,607.5
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		11,067.3		11,030.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		11,365.9		11,565.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						(245.0)	(232.7)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(74.6)	(182.9)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						11,046.3	11,150.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		1,844.6		1,736.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		305.2		312.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(1,849.4)		(1,838.2)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		11,346.7		11,360.9
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(867.5)		(258.5)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		10,479.2		11,102.4
Liability for Future Policy Benefit, before Reinsurance, before Other		7,912.1		8,494.9
Liability for Future Policy Benefit, Other		30.5		30.4
Liability for Future Policy Benefit, before Reinsurance, after Other		7,942.6		8,525.3
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		380.8		421.2
Liability for Future Policy Benefit, after Reinsurance		7,561.8		8,104.1
Liability for Future Policy Benefit, Gross Premium Income		5,378.9		5,103.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		229.4		239.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		17,312.8		17,420.3
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		11,973.3		12,012.5
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 8,176.5		$ 8,196.1
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		4.40%		4.40%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.50%		4.50%
Liability for Future Policy Benefit, Weighted-Average Duration		6 years 9 months 18 days		7 years
Future Policy Benefits	[3]	$ 7,942.6		$ 8,525.3
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		352.8		276.1
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		378.0		314.2
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						0.4	(7.8)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						0.4	5.3
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						378.8	311.7
Liability for Future Policy Benefit, Expected Net Premium, Issuance		28.2		26.8
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		10.9		10.1
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(26.6)		(24.6)
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change		(26.4)		42.7
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		364.9		366.7
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(46.6)		(32.3)
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		318.3		334.4
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		2,699.0		2,391.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		2,923.4		2,641.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						13.6	(15.1)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						11.1	(7.5)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						2,948.1	2,618.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance	[4]	386.5		320.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		59.5		55.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(366.6)		(339.2)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change		(83.2)		228.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		2,944.3		2,884.5
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(367.3)		(272.1)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		2,577.0		2,612.4
Liability for Future Policy Benefit, before Reinsurance, before Other		2,258.7		2,278.0
Liability for Future Policy Benefit, Other		52.9		50.2
Liability for Future Policy Benefit, before Reinsurance, after Other		2,311.6		2,328.2
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		93.0		70.0
Liability for Future Policy Benefit, after Reinsurance		2,218.6		2,258.2
Liability for Future Policy Benefit, Gross Premium Income		892.0		782.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		48.6		45.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		4,748.1		4,641.9
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		1,622.4		1,587.2
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 999.8		$ 994.4
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		4.20%		4.10%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.70%		5.10%
Liability for Future Policy Benefit, Weighted-Average Duration		8 years 7 months 6 days		8 years 9 months 18 days
Future Policy Benefits		$ 2,311.6		$ 2,328.2
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		3,709.0		3,553.3
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		3,850.9		3,793.8
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change		(74.9)		0.7
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(46.5)	(35.8)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						3,729.5	3,758.7
Liability for Future Policy Benefit, Expected Net Premium, Issuance		435.1		426.7
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		106.8		105.8
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(470.1)		(462.1)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		3,801.3		3,829.1
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(323.9)		(136.8)
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		3,477.4		3,692.3
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		5,710.4		5,434.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		6,179.4		6,026.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change		(117.7)		(7.6)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(71.7)	(50.2)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						5,990.0	5,968.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		469.6		461.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		180.8		177.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(496.4)		(480.4)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		6,144.0		6,126.5
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(836.6)		(432.1)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		5,307.4		5,694.4
Liability for Future Policy Benefit, before Reinsurance, before Other		1,830.0		2,002.1
Liability for Future Policy Benefit, Other		30.9		25.3
Liability for Future Policy Benefit, before Reinsurance, after Other		1,860.9		2,027.4
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		1.2		1.2
Liability for Future Policy Benefit, after Reinsurance		1,859.7		2,026.2
Liability for Future Policy Benefit, Gross Premium Income		1,374.6		1,329.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		74.0		71.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		11,233.7		10,893.9
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		13,318.1		13,078.5
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 9,348.6		$ 9,268.7
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		4.50%		4.40%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		6.20%		5.20%
Liability for Future Policy Benefit, Weighted-Average Duration		17 years 7 months 6 days		17 years 7 months 6 days
Future Policy Benefits		$ 1,860.9		$ 2,027.4
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		7,732.7		7,658.5
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		7,484.3		7,592.9
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						49.2	255.3
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(263.7)	(113.6)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						7,269.8	7,734.6
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		281.9		293.8
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(483.6)		(474.0)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		7,068.1		7,554.4
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(269.9)		283.6
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		6,798.2		7,838.0
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		31,206.4		30,063.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		31,169.8		30,544.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						157.1	971.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(30.0)	(51.7)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						31,296.9	31,464.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		57.9		70.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		1,175.9		1,158.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(1,524.6)		(1,462.5)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		31,006.1		31,230.3
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(2,680.0)		397.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		28,326.1		31,627.9
Liability for Future Policy Benefit, before Reinsurance, before Other		21,527.9		23,789.9
Liability for Future Policy Benefit, Other		1,316.2		1,433.7
Liability for Future Policy Benefit, before Reinsurance, after Other		22,844.1		25,223.6
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		8,889.6		9,942.3
Liability for Future Policy Benefit, after Reinsurance		13,954.5		15,281.3
Liability for Future Policy Benefit, Gross Premium Income		634.5		650.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		894.0		864.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		67,534.0		69,916.1
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		11,672.0		12,779.0
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 7,203.6		$ 7,743.2
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		5.30%		5.30%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		6.30%		5.30%
Liability for Future Policy Benefit, Weighted-Average Duration		12 years		12 years 6 months
Future Policy Benefits	[3]	$ 22,844.1		$ 25,223.6
Other Products [Member]
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Future Policy Benefits	[3]	185.4		196.2
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		4,588.1		4,735.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		4,656.9		4,907.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						(56.9)	(93.0)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						2.2	(57.8)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						4,602.2	4,756.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		973.3	[5]	886.7	[6]
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		100.9		110.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(1,081.4)		(1,076.0)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		4,595.0		4,677.4
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(235.7)		(72.5)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		4,359.3		4,604.9
Liability for Future Policy Benefit, before Reinsurance, before Other		4,359.3		4,604.9
Liability for Future Policy Benefit, Other		0.1		0.2
Liability for Future Policy Benefit, before Reinsurance, after Other		4,359.4		4,605.1
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		23.5		25.2
Liability for Future Policy Benefit, after Reinsurance		4,335.9		4,579.9
Liability for Future Policy Benefit, Gross Premium Income		2,467.7		2,362.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		100.9		110.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		5,545.2		5,649.5
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		4.30%		4.30%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.50%		4.40%
Liability for Future Policy Benefit, Weighted-Average Duration		3 years 10 months 24 days		4 years
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		801.6		835.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		807.5		852.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						(2.6)	(7.1)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(35.5)	(32.7)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						769.4	812.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		323.1	[5]	328.8	[6]
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		12.2		13.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(307.3)		(342.0)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		797.4		812.6
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(24.0)		(6.8)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		773.4		805.8
Liability for Future Policy Benefit, before Reinsurance, before Other		773.4		805.8
Liability for Future Policy Benefit, Other		0.8		0.8
Liability for Future Policy Benefit, before Reinsurance, after Other		774.2		806.6
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		5.7		7.3
Liability for Future Policy Benefit, after Reinsurance		768.5		799.3
Liability for Future Policy Benefit, Gross Premium Income		1,678.6		1,574.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		12.2		13.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		901.5		920.6
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		2.50%		2.40%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		3.10%		2.50%
Liability for Future Policy Benefit, Weighted-Average Duration		2 years 3 months 18 days		2 years 4 months 24 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		$ 1,236.5		$ 1,202.5
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		1,232.5		1,230.7
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						(106.2)	(56.9)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(7.6)	(27.6)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						1,118.7	1,146.2
Liability for Future Policy Benefit, Expected Net Premium, Issuance		122.9		164.2
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		37.2		37.4
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(139.0)		(133.3)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		1,139.8		1,214.5
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(51.4)		5.7
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		1,088.4		1,220.2
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		3,140.7		3,096.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		3,150.4		3,191.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						(131.9)	(91.8)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(14.8)	(35.7)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						3,003.7	3,063.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		131.6		176.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		107.0		108.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(217.1)		(217.0)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		3,025.2		3,131.4
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(206.0)		3.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		2,819.2		3,135.2
Liability for Future Policy Benefit, before Reinsurance, before Other		1,730.8		1,915.0
Liability for Future Policy Benefit, Other		24.8		26.4
Liability for Future Policy Benefit, before Reinsurance, after Other		1,755.6		1,941.4
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		340.1		375.7
Liability for Future Policy Benefit, after Reinsurance		1,415.5		1,565.7
Liability for Future Policy Benefit, Gross Premium Income		516.9		509.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		69.8		71.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		4,791.1		5,035.1
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		5,352.1		5,811.6
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 3,949.0		$ 4,192.0
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		5.10%		5.20%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.90%		4.90%
Liability for Future Policy Benefit, Weighted-Average Duration		9 years		9 years 4 months 24 days
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		$ 1,385.5		$ 1,240.2
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		1,447.3		1,335.3
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						(42.2)	(29.6)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(27.0)	(57.3)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						1,378.1	1,248.4
Liability for Future Policy Benefit, Expected Net Premium, Issuance		393.4		323.6
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		38.6		35.1
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(191.4)		(164.7)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		1,618.7		1,442.4
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(140.0)		(55.1)
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		1,478.7		1,387.3
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		2,536.9		2,362.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		2,751.1		2,614.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						(53.6)	(40.8)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(26.5)	(56.7)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						2,671.0	2,517.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		416.6		344.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		85.1		80.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(243.6)		(203.2)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		2,929.1		2,739.5
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(401.8)		(183.0)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		2,527.3		2,556.5
Liability for Future Policy Benefit, before Reinsurance, before Other		1,048.6		1,169.2
Liability for Future Policy Benefit, Other		4.8		3.0
Liability for Future Policy Benefit, before Reinsurance, after Other		1,053.4		1,172.2
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		11.5		13.0
Liability for Future Policy Benefit, after Reinsurance		1,041.9		1,159.2
Liability for Future Policy Benefit, Gross Premium Income		715.7		658.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		46.5		45.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		6,075.0		5,815.1
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		6,621.2		6,200.9
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 4,227.5		$ 4,004.1
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		5.00%		5.00%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		6.30%		5.40%
Liability for Future Policy Benefit, Weighted-Average Duration		17 years 7 months 6 days		18 years 1 month 6 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		6,785.8		7,138.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		7,056.2		7,591.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						(0.1)	(3.3)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(10.3)	(25.1)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						7,045.8	7,562.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		57.9	[7]	70.3	[8]
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		228.1		244.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(631.0)		(677.7)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		6,700.8		7,200.0
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(669.2)		(253.0)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		6,031.6		6,947.0
Liability for Future Policy Benefit, before Reinsurance, before Other		6,031.6		6,947.0
Liability for Future Policy Benefit, Other		1,313.9	[9]	1,429.0	[10]
Liability for Future Policy Benefit, before Reinsurance, after Other		7,345.5		8,376.0
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		5,754.8		6,553.6
Liability for Future Policy Benefit, after Reinsurance		1,590.7		1,822.4
Liability for Future Policy Benefit, Gross Premium Income		102.3		121.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		228.1		244.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		9,666.2		10,468.0
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		6.10%		5.00%
Liability for Future Policy Benefit, Weighted-Average Duration		7 years		7 years 1 month 6 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		$ 7,732.7		$ 7,658.5
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		7,484.3		7,592.9
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						49.2	255.3
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(263.7)	(113.6)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						7,269.8	7,734.6
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		281.9		293.8
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(483.6)		(474.0)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		7,068.1		7,554.4
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(269.9)		283.6
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		6,798.2		7,838.0
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		24,420.6		22,925.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		24,113.6		22,953.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						157.2	974.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(19.7)	(26.6)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						$ 24,251.1	$ 23,901.7
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		947.8		913.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(893.6)		(784.8)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		24,305.3		24,030.3
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(2,010.8)		650.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		22,294.5		24,680.9
Liability for Future Policy Benefit, before Reinsurance, before Other		15,496.3		16,842.9
Liability for Future Policy Benefit, Other		2.3		4.7
Liability for Future Policy Benefit, before Reinsurance, after Other		15,498.6		16,847.6
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		3,134.8		3,388.7
Liability for Future Policy Benefit, after Reinsurance		12,363.8		13,458.9
Liability for Future Policy Benefit, Gross Premium Income		532.2		529.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		665.9		619.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		57,867.8		59,448.1
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		11,672.0		12,779.0
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 7,203.6		$ 7,743.2
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		5.60%		5.60%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		6.40%		5.40%
Liability for Future Policy Benefit, Weighted-Average Duration		14 years		14 years 10 months 24 days
Liability for Future Policy Benefit, Adverse Development, Expense		$ 121.6		$ 425.6
Cancer and Critical Illness Colonial | Colonial Life
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Liability for Future Policy Benefit, Adverse Development, Expense				$ 10.9

[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] 2Other primarily relates to our Closed Block - All Other product line.

[3] 1Unum US excludes the dental and vision product line and medical stop-loss products, Unum International excludes certain products in our supplemental product line and Closed Block excludes our participating fund account, which represents policies issued by one of our subsidiaries prior to its conversion from a mutual stock life insurance company. The liabilities associated with these products are included within Other products.

[4] 1Issuances for Unum International primarily represent 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 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.

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

[8] 1Issuances for Closed Block - All Other represents new claim incurrals.

[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.

[10] 2Other for Closed Block - All Other primarily includes our closed block group pension products and certain of our ceded closed block individual life products.