Liability for Future Policy Benefit Activity (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2025		Sep. 30, 2024		Dec. 31, 2024	Dec. 31, 2023
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Future Policy Benefits		$ 38,300.7				$ 36,806.4
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		13,930.6		$ 14,417.8
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		14,266.9		14,243.2
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						161.7	$ 73.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(229.0)	(151.9)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						14,199.6	14,164.3
Liability for Future Policy Benefit, Expected Net Premium, Issuance		941.3		856.7
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		482.2		481.8
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(1,258.7)		(1,222.6)
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change		42.7		7.3
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		14,407.1		14,287.5
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		65.1		319.0
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		14,472.2		14,606.5
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		48,920.1		52,423.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		50,778.2		51,305.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						715.9	(248.5)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(292.3)	(355.6)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						$ 51,201.8	$ 50,701.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance	[1]	2,588.5		2,506.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		1,703.4		1,707.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(4,120.3)		(4,078.4)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change		228.8		121.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		51,602.2		50,958.4
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(565.1)		1,204.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		51,037.1		52,162.5
Liability for Future Policy Benefit, before Reinsurance, before Other		36,564.9		37,556.0
Liability for Future Policy Benefit, Other		1,539.6		1,655.7
Liability for Future Policy Benefit, before Reinsurance, after Other		38,104.5		39,211.7
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		10,434.7		7,455.9
Liability for Future Policy Benefit, after Reinsurance		27,669.8		31,755.8
Liability for Future Policy Benefit, Gross Premium Income		7,866.7		7,568.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		1,221.2		1,225.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		102,872.2		104,039.1
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		39,457.2		39,394.1
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 26,202.4		$ 25,941.4
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		4.90%		4.90%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.10%		4.80%		5.30%	4.80%
Liability for Future Policy Benefit, Weighted-Average Duration		11 years 2 months 12 days		11 years 6 months
Future Policy Benefits		$ 38,300.7		$ 39,444.5
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		2,442.7		2,431.4
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		2,566.0		2,486.9
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						$ (86.5)	$ (58.7)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(84.9)	(77.4)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						2,394.6	2,350.8
Liability for Future Policy Benefit, Expected Net Premium, Issuance		487.8		414.2
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		72.5		69.7
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(298.0)		(283.6)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		2,656.9		2,551.1
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(49.4)		(25.0)
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		2,607.5		2,526.1
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		11,030.0		11,752.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		11,565.8		11,949.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						(232.7)	(197.2)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(182.9)	(302.1)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						11,150.2	11,450.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		1,736.5		1,669.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		312.4		322.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(1,838.2)		(1,845.0)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		11,360.9		11,596.9
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(258.5)		(75.6)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		11,102.4		11,521.3
Liability for Future Policy Benefit, before Reinsurance, before Other		8,494.9		8,995.2
Liability for Future Policy Benefit, Other		30.4		31.7
Liability for Future Policy Benefit, before Reinsurance, after Other		8,525.3		9,026.9
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		421.2		200.8
Liability for Future Policy Benefit, after Reinsurance		8,104.1		8,826.1
Liability for Future Policy Benefit, Gross Premium Income		5,103.9		4,906.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		239.9		252.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		17,420.3		17,640.3
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		12,012.5		11,639.4
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 8,196.1		$ 8,034.8
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		4.40%		4.30%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		4.50%		4.30%
Liability for Future Policy Benefit, Weighted-Average Duration		7 years		7 years 1 month 6 days
Future Policy Benefits	[2]	$ 8,525.3		$ 9,026.9
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		276.1		270.3
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		314.2		298.4
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						(7.8)	(5.9)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						5.3	15.1
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						311.7	307.6
Liability for Future Policy Benefit, Expected Net Premium, Issuance		26.8		25.3
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		10.1		8.7
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(24.6)		(21.2)
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change		42.7		7.3
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		366.7		327.7
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(32.3)		(27.9)
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		334.4		299.8
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		2,391.6		2,527.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		2,641.5		2,687.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						(15.1)	0.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(7.5)	(13.4)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						2,618.9	2,673.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance	[3]	320.5		300.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		55.5		51.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(339.2)		(326.4)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change		228.8		121.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		2,884.5		2,820.0
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(272.1)		(214.9)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		2,612.4		2,605.1
Liability for Future Policy Benefit, before Reinsurance, before Other		2,278.0		2,305.3
Liability for Future Policy Benefit, Other		50.2		43.1
Liability for Future Policy Benefit, before Reinsurance, after Other		2,328.2		2,348.4
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		70.0		78.0
Liability for Future Policy Benefit, after Reinsurance		2,258.2		2,270.4
Liability for Future Policy Benefit, Gross Premium Income		782.8		710.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		45.4		42.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		4,641.9		4,536.2
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		1,587.2		1,335.6
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 994.4		$ 854.1
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		4.10%		4.10%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.10%		4.90%
Liability for Future Policy Benefit, Weighted-Average Duration		8 years 9 months 18 days		8 years 10 months 24 days
Future Policy Benefits		$ 2,328.2		$ 2,348.4
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		3,553.3		3,592.6
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		3,793.8		3,754.3
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change		0.7		(7.9)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(35.8)	(57.0)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						3,758.7	3,689.4
Liability for Future Policy Benefit, Expected Net Premium, Issuance		426.7		417.2
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		105.8		101.4
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(462.1)		(455.5)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		3,829.1		3,752.5
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(136.8)		(105.6)
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		3,692.3		3,646.9
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		5,434.9		5,566.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		6,026.2		5,925.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change		(7.6)		(52.7)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(50.2)	(84.2)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						5,968.4	5,788.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		461.2		455.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		177.3		172.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(480.4)		(458.4)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		6,126.5		5,957.2
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(432.1)		(303.5)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		5,694.4		5,653.7
Liability for Future Policy Benefit, before Reinsurance, before Other		2,002.1		2,006.8
Liability for Future Policy Benefit, Other		25.3		25.1
Liability for Future Policy Benefit, before Reinsurance, after Other		2,027.4		2,031.9
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		1.2		1.5
Liability for Future Policy Benefit, after Reinsurance		2,026.2		2,030.4
Liability for Future Policy Benefit, Gross Premium Income		1,329.8		1,286.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		71.5		70.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		10,893.9		10,242.2
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		13,078.5		12,450.4
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 9,268.7		$ 8,948.9
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		4.40%		4.40%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.20%		4.80%
Liability for Future Policy Benefit, Weighted-Average Duration		17 years 7 months 6 days		17 years 3 months 18 days
Future Policy Benefits		$ 2,027.4		$ 2,031.9
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		7,658.5		8,123.5
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		7,592.9		7,703.6
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						255.3	145.5
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(113.6)	(32.6)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						7,734.6	7,816.5
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		293.8		302.0
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(474.0)		(462.3)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		7,554.4		7,656.2
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		283.6		477.5
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		7,838.0		8,133.7
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		30,063.6		32,577.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		30,544.7		30,743.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						971.3	1.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(51.7)	44.1
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						31,464.3	30,789.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		70.3		82.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		1,158.2		1,161.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(1,462.5)		(1,448.6)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		31,230.3		30,584.3
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		397.6		1,798.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		31,627.9		32,382.4
Liability for Future Policy Benefit, before Reinsurance, before Other		23,789.9		24,248.7
Liability for Future Policy Benefit, Other		1,433.7		1,555.8
Liability for Future Policy Benefit, before Reinsurance, after Other		25,223.6		25,804.5
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		9,942.3		7,175.6
Liability for Future Policy Benefit, after Reinsurance		15,281.3		18,628.9
Liability for Future Policy Benefit, Gross Premium Income		650.2		665.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		864.4		859.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		69,916.1		71,620.4
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		12,779.0		13,968.7
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 7,743.2		$ 8,103.6
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		5.30%		5.20%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.30%		4.90%
Liability for Future Policy Benefit, Weighted-Average Duration		12 years 6 months		13 years
Future Policy Benefits	[2]	$ 25,223.6		$ 25,804.5
Other Products [Member]
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Future Policy Benefits	[2]	196.2		232.8
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		4,735.8		5,147.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		4,907.5		5,277.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						(93.0)	(76.4)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(57.8)	(152.4)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						4,756.7	5,048.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		886.7	[4]	893.7	[5]
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		110.0		121.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(1,076.0)		(1,109.7)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		4,677.4		4,954.0
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(72.5)		(43.4)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		4,604.9		4,910.6
Liability for Future Policy Benefit, before Reinsurance, before Other		4,604.9		4,910.6
Liability for Future Policy Benefit, Other		0.2		0.1
Liability for Future Policy Benefit, before Reinsurance, after Other		4,605.1		4,910.7
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		25.2		26.8
Liability for Future Policy Benefit, after Reinsurance		4,579.9		4,883.9
Liability for Future Policy Benefit, Gross Premium Income		2,362.1		2,294.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		110.0		121.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		5,649.5		6,001.5
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%		4.10%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		4.40%		4.30%
Liability for Future Policy Benefit, Weighted-Average Duration		4 years		4 years 2 months 12 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		835.2		922.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		852.6		936.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						(7.1)	(17.0)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(32.7)	(49.7)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						812.8	869.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		328.8	[4]	333.3	[5]
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		13.0		14.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(342.0)		(357.8)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		812.6		859.6
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(6.8)		(6.3)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		805.8		853.3
Liability for Future Policy Benefit, before Reinsurance, before Other		805.8		853.3
Liability for Future Policy Benefit, Other		0.8		0.8
Liability for Future Policy Benefit, before Reinsurance, after Other		806.6		854.1
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		7.3		5.7
Liability for Future Policy Benefit, after Reinsurance		799.3		848.4
Liability for Future Policy Benefit, Gross Premium Income		1,574.1		1,496.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		13.0		14.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		920.6		977.0
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		2.40%		2.30%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		2.50%		2.40%
Liability for Future Policy Benefit, Weighted-Average Duration		2 years 4 months 24 days		2 years 6 months
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		$ 1,202.5		$ 1,296.7
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		1,230.7		1,294.4
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						(56.9)	(100.2)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(27.6)	(5.3)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						1,146.2	1,188.9
Liability for Future Policy Benefit, Expected Net Premium, Issuance		164.2		119.2
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		37.4		39.8
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(133.3)		(138.7)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		1,214.5		1,209.2
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		5.7		16.7
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		1,220.2		1,225.9
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		3,096.5		3,348.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		3,191.1		3,313.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						(91.8)	(155.4)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(35.7)	(18.9)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						3,063.6	3,139.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		176.2		127.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		108.6		113.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(217.0)		(207.2)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		3,131.4		3,172.8
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		3.8		65.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		3,135.2		3,238.6
Liability for Future Policy Benefit, before Reinsurance, before Other		1,915.0		2,012.7
Liability for Future Policy Benefit, Other		26.4		28.1
Liability for Future Policy Benefit, before Reinsurance, after Other		1,941.4		2,040.8
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		375.7		154.6
Liability for Future Policy Benefit, after Reinsurance		1,565.7		1,886.2
Liability for Future Policy Benefit, Gross Premium Income		509.5		494.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		71.2		73.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		5,035.1		5,082.2
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		5,811.6		5,817.0
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 4,192.0		$ 4,180.2
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		5.20%		5.10%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		4.90%		4.60%
Liability for Future Policy Benefit, Weighted-Average Duration		9 years 4 months 24 days		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		$ 1,240.2		$ 1,134.7
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		1,335.3		1,192.5
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						(29.6)	41.5
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(57.3)	(72.1)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						1,248.4	1,161.9
Liability for Future Policy Benefit, Expected Net Premium, Issuance		323.6		295.0
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		35.1		29.9
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(164.7)		(144.9)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		1,442.4		1,341.9
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(55.1)		(41.7)
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		1,387.3		1,300.2
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		2,362.5		2,334.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		2,614.6		2,422.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						(40.8)	51.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(56.7)	(81.1)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						2,517.1	2,392.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		344.8		315.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		80.8		73.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(203.2)		(170.3)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		2,739.5		2,610.5
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(183.0)		(91.7)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		2,556.5		2,518.8
Liability for Future Policy Benefit, before Reinsurance, before Other		1,169.2		1,218.6
Liability for Future Policy Benefit, Other		3.0		2.7
Liability for Future Policy Benefit, before Reinsurance, after Other		1,172.2		1,221.3
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		13.0		13.7
Liability for Future Policy Benefit, after Reinsurance		1,159.2		1,207.6
Liability for Future Policy Benefit, Gross Premium Income		658.2		621.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		45.7		43.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		5,815.1		5,579.6
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		6,200.9		5,822.4
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 4,004.1		$ 3,854.6
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%		4.90%
Liability for Future Policy Benefit, Weighted-Average Duration		18 years 1 month 6 days		18 years 6 months
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		7,138.4		7,880.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		7,591.0		8,094.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						(3.3)	5.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(25.1)	5.2
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						7,562.6	8,105.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		70.3	[6]	82.3	[7]
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		244.8		261.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(677.7)		(738.6)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		7,200.0		7,710.5
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(253.0)		(129.2)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		6,947.0		7,581.3
Liability for Future Policy Benefit, before Reinsurance, before Other		6,947.0		7,581.3
Liability for Future Policy Benefit, Other		1,429.0	[8]	1,556.5	[9]
Liability for Future Policy Benefit, before Reinsurance, after Other		8,376.0		9,137.8
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		6,553.6		7,171.4
Liability for Future Policy Benefit, after Reinsurance		1,822.4		1,966.4
Liability for Future Policy Benefit, Gross Premium Income		121.2		143.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense				261.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		10,468.0		11,281.4
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		4.60%		4.60%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.00%		4.70%
Liability for Future Policy Benefit, Weighted-Average Duration		7 years 1 month 6 days		7 years 2 months 12 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		$ 7,658.5		$ 8,123.5
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period		7,592.9		7,703.6
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change						255.3	145.5
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(113.6)	(32.6)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change						7,734.6	7,816.5
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		293.8		302.0
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(474.0)		(462.3)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		7,554.4		7,656.2
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		283.6		477.5
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change		7,838.0		8,133.7
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		22,925.2		24,697.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period		22,953.7		22,649.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change						974.6	(4.1)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience						(26.6)	38.9
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change						$ 23,901.7	$ 22,684.1
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		913.4		899.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(784.8)		(710.0)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period		24,030.3		22,873.8
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		650.6		1,927.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year		24,680.9		24,801.1
Liability for Future Policy Benefit, before Reinsurance, before Other		16,842.9		16,667.4
Liability for Future Policy Benefit, Other		4.7		(0.7)
Liability for Future Policy Benefit, before Reinsurance, after Other		16,847.6		16,666.7
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		3,388.7		4.2
Liability for Future Policy Benefit, after Reinsurance		13,458.9		16,662.5
Liability for Future Policy Benefit, Gross Premium Income		529.0		521.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		619.6		597.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		59,448.1		60,339.0
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		12,779.0		13,968.7
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 7,743.2		$ 8,103.6
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%		5.00%
Liability for Future Policy Benefit, Weighted-Average Duration		14 years 10 months 24 days		15 years 10 months 24 days
Liability for Future Policy Benefit, Adverse Development, Expense		$ 425.6		$ (70.8)
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] 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.