Liability for Future Policy Benefit, Activity (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Future Policy Benefits		$ 38,017.0	$ 36,806.4
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	$ 2,071.1
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance beginning of year		2,566.0	2,486.9	2,166.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change			(86.5)	(58.7)	$ 185.7
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			(60.8)	(69.6)	(90.2)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change			2,418.7	2,358.6	2,261.5
Liability for Future Policy Benefit, Expected Net Premium, Issuance		555.1	485.0	486.5
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		94.6	91.0	77.2
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(388.6)	(368.6)	(338.3)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance end of period		2,679.8	2,566.0	2,486.9
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(57.8)	(123.3)	(55.5)
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period		2,622.0	2,442.7	2,431.4
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, balance beginning of year		11,030.0	11,752.5	11,698.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of year		11,565.8	11,949.5	12,177.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change			(232.7)	(197.2)	77.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			(145.3)	(309.1)	(377.2)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change			11,187.8	11,443.2	11,877.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance	[1]	2,042.3	1,991.0	2,007.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		402.9	415.8	442.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(2,267.1)	(2,284.2)	(2,378.2)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		11,365.9	11,565.8	11,949.5
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(298.6)	(535.8)	(197.0)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of period		11,067.3	11,030.0	11,752.5
Liability for Future Policy Benefit, before Reinsurance, before Other		8,445.3	8,587.3	9,321.1
Liability for Future Policy Benefit, Other		32.2	30.4	31.6
Liability for Future Policy Benefit, before Reinsurance, after Other		8,477.5	8,617.7	9,352.7
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		421.6	194.0	208.6
Liability for Future Policy Benefit, after Reinsurance		8,055.9	8,423.7	9,144.1
Gross premiums or assessments		6,799.0	6,547.1	6,263.2
interest accretion		308.3	324.8	364.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		17,453.4	17,621.3	17,926.6
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		12,029.3	11,657.3	11,175.4
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 8,176.2	$ 8,027.2	$ 7,830.4
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		4.40%	4.30%	4.20%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		4.50%	4.90%	4.50%
Liability for Future Policy Benefit, Weighted-Average Duration		7 years	7 years 1 month 6 days	7 years
Future Policy Benefits	[2]	$ 8,477.5	$ 8,617.7	$ 9,352.7
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	197.1
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance beginning of year		314.2	298.4	246.8
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change			(7.8)	(5.9)	(5.1)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			6.2	19.9	17.1
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change			312.6	312.4	258.8
Liability for Future Policy Benefit, Expected Net Premium, Issuance		37.6	34.4	23.5
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		13.4	11.4	9.4
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(33.3)	(28.5)	(23.0)
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change		47.7	(15.5)	29.7
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance end of period		378.0	314.2	298.4
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(25.2)	(38.1)	(28.1)
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period		352.8	276.1	270.3
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, balance beginning of year		2,391.6	2,527.4	2,231.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of year		2,641.5	2,687.1	2,495.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change			(15.1)	0.1	17.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			(10.5)	(20.5)	1.3
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change			2,615.9	2,666.7	2,514.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance	[3]	424.0	379.0	335.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		74.0	67.9	63.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(433.0)	(409.3)	(388.3)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change		242.5	(62.8)	162.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		2,923.4	2,641.5	2,687.1
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(224.4)	(249.9)	(159.7)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of period		2,699.0	2,391.6	2,527.4
Liability for Future Policy Benefit, before Reinsurance, before Other		2,346.2	2,115.5	2,257.1
Liability for Future Policy Benefit, Other		49.8	40.7	36.1
Liability for Future Policy Benefit, before Reinsurance, after Other		2,396.0	2,156.2	2,293.2
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		70.4	67.9	78.7
Liability for Future Policy Benefit, after Reinsurance		2,325.6	2,088.3	2,214.5
Gross premiums or assessments		1,061.5	957.1	849.0
interest accretion		60.6	56.5	54.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		4,723.8	4,258.2	4,261.1
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		1,652.7	1,295.7	1,196.6
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 1,030.3	$ 823.4	$ 778.6
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		4.10%	4.10%	4.00%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		4.90%	5.10%	4.60%
Liability for Future Policy Benefit, Weighted-Average Duration		8 years 9 months 18 days	8 years 9 months 18 days	8 years 7 months 6 days
Future Policy Benefits		$ 2,396.0	$ 2,156.2	$ 2,293.2
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		3,553.3	3,592.6	3,745.4
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance beginning of year		3,793.8	3,754.3	4,046.4
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change			0.7	(7.9)	(322.7)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			(48.9)	(57.3)	(53.5)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change			3,745.6	3,689.1	3,670.2
Liability for Future Policy Benefit, Expected Net Premium, Issuance		564.5	555.9	544.9
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		138.4	132.8	122.7
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(597.6)	(584.0)	(583.5)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance end of period		3,850.9	3,793.8	3,754.3
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(141.9)	(240.5)	(161.7)
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period		3,709.0	3,553.3	3,592.6
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, balance beginning of year		5,434.9	5,566.0	5,581.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of year		6,026.2	5,925.2	6,163.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change			(7.6)	(52.7)	(402.9)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			(71.9)	(92.2)	(52.0)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change			5,946.7	5,780.3	5,709.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance		617.9	610.8	605.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		233.8	224.4	211.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(619.0)	(589.3)	(601.0)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		6,179.4	6,026.2	5,925.2
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(469.0)	(591.3)	(359.2)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of period		5,710.4	5,434.9	5,566.0
Liability for Future Policy Benefit, before Reinsurance, before Other		2,001.4	1,881.6	1,973.4
Liability for Future Policy Benefit, Other		30.6	22.6	24.4
Liability for Future Policy Benefit, before Reinsurance, after Other		2,032.0	1,904.2	1,997.8
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		1.3	0.9	1.8
Liability for Future Policy Benefit, after Reinsurance		2,030.7	1,903.3	1,996.0
Gross premiums or assessments		1,778.3	1,718.9	1,658.6
interest accretion		95.4	91.6	88.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		11,058.1	10,409.4	9,796.7
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		13,212.6	12,618.4	11,903.1
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 9,336.4	$ 9,049.4	$ 8,702.2
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		4.50%	4.40%	4.30%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.30%	5.50%	4.80%
Liability for Future Policy Benefit, Weighted-Average Duration		17 years 7 months 6 days	17 years 3 months 18 days	17 years
Future Policy Benefits		$ 2,032.0	$ 1,904.2	$ 1,997.8
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	6,412.6
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance beginning of year		7,592.9	7,703.6	6,236.1
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change			255.3	145.5	1,641.3
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			(119.6)	(41.2)	44.1
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change			7,728.6	7,807.9	7,921.5
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		392.0	401.8	374.7
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(636.3)	(616.8)	(592.6)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance end of period		7,484.3	7,592.9	7,703.6
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		248.4	65.6	419.9
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period		7,732.7	7,658.5	8,123.5
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, balance beginning of year		30,063.6	32,577.7	29,418.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of year		30,544.7	30,743.9	28,852.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change			971.3	1.3	2,009.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			(20.1)	85.7	117.1
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change			31,495.9	30,830.9	30,978.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance	[4]	80.4	101.2	123.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		1,551.1	1,545.0	1,510.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(1,957.6)	(1,932.4)	(1,868.6)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		31,169.8	30,544.7	30,743.9
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		36.6	(481.1)	1,833.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of period		31,206.4	30,063.6	32,577.7
Liability for Future Policy Benefit, before Reinsurance, before Other		23,473.7	22,405.1	24,454.2
Liability for Future Policy Benefit, Other	[5]	1,449.5	1,498.0	1,661.2
Liability for Future Policy Benefit, before Reinsurance, after Other		24,923.2	23,903.1	26,115.4
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		9,825.0	6,775.9	7,466.9
Liability for Future Policy Benefit, after Reinsurance		15,098.2	17,127.2	18,648.5
Gross premiums or assessments		865.7	884.4	919.9
interest accretion		1,159.1	1,143.2	1,135.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		69,478.9	71,145.2	73,341.4
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		12,601.0	13,767.1	14,486.4
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 7,673.0	$ 8,029.1	$ 8,241.7
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		5.30%	5.30%	5.20%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.40%	5.50%	4.90%
Liability for Future Policy Benefit, Weighted-Average Duration		12 years 4 months 24 days	12 years 10 months 24 days	13 years 2 months 12 days
Future Policy Benefits	[2]	$ 24,923.2	$ 23,903.1	$ 26,115.4
Other Products
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Future Policy Benefits	[2]	188.3	225.2	250.3
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	0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance beginning of year		0.0	0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change			0.0	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	0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change			0.0	0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Issuance		0.0	0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		0.0	0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		0.0	0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance end of period		0.0	0.0	0.0
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		0.0	0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period		0.0	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, balance beginning of year		4,735.8	5,147.4	5,533.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of year		4,907.5	5,277.1	5,793.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change			(93.0)	(76.4)	(100.2)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			(43.6)	(168.9)	(204.0)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change			4,770.9	5,031.8	5,488.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance	[1]	1,081.9	1,093.2	1,094.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		136.7	151.3	171.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(1,332.6)	(1,368.8)	(1,477.5)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		4,656.9	4,907.5	5,277.1
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(68.8)	(171.7)	(129.7)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of period		4,588.1	4,735.8	5,147.4
Liability for Future Policy Benefit, before Reinsurance, before Other		4,588.1	4,735.8	5,147.4
Liability for Future Policy Benefit, Other		0.2	0.4	0.2
Liability for Future Policy Benefit, before Reinsurance, after Other		4,588.3	4,736.2	5,147.6
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		24.8	26.4	30.7
Liability for Future Policy Benefit, after Reinsurance		4,563.5	4,709.8	5,116.9
Gross premiums or assessments		3,149.9	3,070.4	2,958.7
interest accretion		136.7	151.3	171.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		5,634.4	5,953.3	6,376.6
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		0.0	0.0	0.0
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 0.0	$ 0.0	$ 0.0
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		4.30%	4.20%	4.00%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		4.40%	4.90%	4.60%
Liability for Future Policy Benefit, Weighted-Average Duration		4 years	4 years 2 months 12 days	4 years 3 months 18 days
Group Life and AD&D | Unum US
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year		$ 0.0	$ 0.0	$ 0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance beginning of year		0.0	0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change			0.0	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	0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change			0.0	0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Issuance		0.0	0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		0.0	0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		0.0	0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance end of period		0.0	0.0	0.0
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		0.0	0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period		0.0	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, balance beginning of year		835.2	922.0	972.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of year		852.6	936.5	998.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change			(7.1)	(17.0)	0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			(44.9)	(53.1)	(37.0)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change			800.6	866.4	961.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance	[1]	363.1	375.4	394.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		16.3	17.7	20.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(372.5)	(406.9)	(439.2)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		807.5	852.6	936.5
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(5.9)	(17.4)	(14.5)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of period		801.6	835.2	922.0
Liability for Future Policy Benefit, before Reinsurance, before Other		801.6	835.2	922.0
Liability for Future Policy Benefit, Other		0.8	0.8	1.0
Liability for Future Policy Benefit, before Reinsurance, after Other		802.4	836.0	923.0
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		6.0	5.3	7.2
Liability for Future Policy Benefit, after Reinsurance		796.4	830.7	915.8
Gross premiums or assessments		2,097.2	1,996.0	1,878.0
interest accretion		16.3	17.7	20.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		910.7	964.5	1,063.2
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		0.0	0.0	0.0
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 0.0	$ 0.0	$ 0.0
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		2.40%	2.30%	2.20%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		2.50%	2.70%	2.60%
Liability for Future Policy Benefit, Weighted-Average Duration		2 years 3 months 18 days	2 years 4 months 24 days	2 years 7 months 6 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	$ 868.2
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance beginning of year		1,335.3	1,192.5	937.9
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change			(29.6)	41.5	180.7
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			(41.4)	(66.2)	(79.8)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change			1,264.3	1,167.8	1,038.8
Liability for Future Policy Benefit, Expected Net Premium, Issuance		351.6	316.3	288.6
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		45.7	39.4	29.0
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(214.3)	(188.2)	(163.9)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance end of period		1,447.3	1,335.3	1,192.5
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		(61.8)	(95.1)	(57.8)
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period		1,385.5	1,240.2	1,134.7
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, balance beginning of year		2,362.5	2,334.5	1,999.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of year		2,614.6	2,422.0	2,141.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change			(40.8)	51.6	170.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			(36.5)	(68.0)	(90.9)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change			2,537.3	2,405.6	2,220.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance	[1]	375.3	339.3	303.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		106.6	97.7	86.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(268.1)	(228.0)	(188.3)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		2,751.1	2,614.6	2,422.0
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(214.2)	(252.1)	(87.5)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of period		2,536.9	2,362.5	2,334.5
Liability for Future Policy Benefit, before Reinsurance, before Other		1,151.4	1,122.3	1,199.8
Liability for Future Policy Benefit, Other		4.1	2.8	2.6
Liability for Future Policy Benefit, before Reinsurance, after Other		1,155.5	1,125.1	1,202.4
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		12.9	13.0	14.0
Liability for Future Policy Benefit, after Reinsurance		1,142.6	1,112.1	1,188.4
Gross premiums or assessments		871.9	821.7	789.9
interest accretion		60.9	58.3	57.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		5,838.3	5,590.6	5,173.1
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		6,205.6	5,799.1	5,450.6
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 3,975.5	$ 3,815.4	$ 3,717.5
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		5.00%	5.00%	5.00%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.50%	5.50%	4.90%
Liability for Future Policy Benefit, Weighted-Average Duration		18 years 1 month 6 days	18 years 3 months 18 days	18 years 1 month 6 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		$ 1,202.5	$ 1,296.7	$ 1,202.9
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance beginning of year		1,230.7	1,294.4	1,228.1
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change			(56.9)	(100.2)	5.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			(19.4)	(3.4)	(10.4)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change			1,154.4	1,190.8	1,222.7
Liability for Future Policy Benefit, Expected Net Premium, Issuance		203.5	168.7	197.9
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		48.9	51.6	48.2
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(174.3)	(180.4)	(174.4)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance end of period		1,232.5	1,230.7	1,294.4
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		4.0	(28.2)	2.3
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period		1,236.5	1,202.5	1,296.7
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, balance beginning of year		3,096.5	3,348.6	3,192.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of year		3,191.1	3,313.9	3,244.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change			(91.8)	(155.4)	7.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			(20.3)	(19.1)	(45.3)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change			3,079.0	3,139.4	3,207.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance	[1]	222.0	183.1	215.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		143.3	149.1	164.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(293.9)	(280.5)	(273.2)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		3,150.4	3,191.1	3,313.9
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(9.7)	(94.6)	34.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of period		3,140.7	3,096.5	3,348.6
Liability for Future Policy Benefit, before Reinsurance, before Other		1,904.2	1,894.0	2,051.9
Liability for Future Policy Benefit, Other		27.1	26.4	27.8
Liability for Future Policy Benefit, before Reinsurance, after Other		1,931.3	1,920.4	2,079.7
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		377.9	149.3	156.7
Liability for Future Policy Benefit, after Reinsurance		1,553.4	1,771.1	1,923.0
Gross premiums or assessments		680.0	659.0	636.6
interest accretion		94.4	97.5	116.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		5,070.0	5,112.9	5,313.7
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		5,823.7	5,858.2	5,724.8
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 4,200.7	$ 4,211.8	$ 4,112.9
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		5.20%	5.10%	5.10%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		4.90%	5.30%	4.80%
Liability for Future Policy Benefit, Weighted-Average Duration		9 years 4 months 24 days	9 years 4 months 24 days	9 years 7 months 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		$ 7,658.5	$ 8,123.5	$ 6,412.6
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance beginning of year		7,592.9	7,703.6	6,236.1
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change			255.3	145.5	1,641.3
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			(119.6)	(41.2)	44.1
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change			7,728.6	7,807.9	7,921.5
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		392.0	401.8	374.7
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(636.3)	(616.8)	(592.6)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance end of period		7,484.3	7,592.9	7,703.6
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		248.4	65.6	419.9
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period		7,732.7	7,658.5	8,123.5
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, balance beginning of year		22,925.2	24,697.7	21,199.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of year		22,953.7	22,649.3	20,221.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change			974.6	(4.1)	2,009.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			16.9	68.3	113.1
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change			23,945.2	22,713.5	22,344.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance	[4]	0.0	0.0	0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		1,228.1	1,199.8	1,151.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(1,059.7)	(959.6)	(846.2)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		24,113.6	22,953.7	22,649.3
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		307.0	(28.5)	2,048.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of period		24,420.6	22,925.2	24,697.7
Liability for Future Policy Benefit, before Reinsurance, before Other		16,687.9	15,266.7	16,574.2
Liability for Future Policy Benefit, Other	[5]	4.1	1.7	23.1
Liability for Future Policy Benefit, before Reinsurance, after Other		16,692.0	15,268.4	16,597.3
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		3,369.4	4.2	4.5
Liability for Future Policy Benefit, after Reinsurance		13,322.6	15,264.2	16,592.8
Gross premiums or assessments		707.2	696.2	696.1
interest accretion		836.1	798.0	776.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		59,239.1	60,051.5	61,447.7
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		12,601.0	13,767.1	14,486.4
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 7,673.0	$ 8,029.1	$ 8,241.7
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		5.60%	5.60%	5.60%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.50%	5.60%	5.00%
Liability for Future Policy Benefit, Weighted-Average Duration		14 years 8 months 12 days	15 years 8 months 12 days	16 years 4 months 24 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	$ 0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance beginning of year		0.0	0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change			0.0	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	0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change			0.0	0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		0.0	0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		0.0	0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance end of period		0.0	0.0	0.0
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		0.0	0.0	0.0
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period		0.0	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, balance beginning of year		7,138.4	7,880.0	8,218.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of year		7,591.0	8,094.6	8,630.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change			(3.3)	5.4	0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			(37.0)	17.4	4.0
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change			7,550.7	8,117.4	8,634.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance	[4]	80.4	101.2	123.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		323.0	345.2	358.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(897.9)	(972.8)	(1,022.4)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		7,056.2	7,591.0	8,094.6
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(270.4)	(452.6)	(214.6)
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of period		6,785.8	7,138.4	7,880.0
Liability for Future Policy Benefit, before Reinsurance, before Other		6,785.8	7,138.4	7,880.0
Liability for Future Policy Benefit, Other	[5]	1,445.4	1,496.3	1,638.1
Liability for Future Policy Benefit, before Reinsurance, after Other		8,231.2	8,634.7	9,518.1
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		6,455.6	6,771.7	7,462.4
Liability for Future Policy Benefit, after Reinsurance		1,775.6	1,863.0	2,055.7
Gross premiums or assessments		158.5	188.2	223.8
interest accretion		323.0	345.2	358.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		10,239.8	11,093.7	11,893.7
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		0.0	0.0	0.0
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 0.0	$ 0.0	$ 0.0
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		4.60%	4.60%	4.60%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.00%	5.40%	4.90%
Liability for Future Policy Benefit, Weighted-Average Duration		7 years 1 month 6 days	7 years 2 months 12 days	7 years 3 months 18 days
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	$ 12,426.2
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance beginning of year		14,266.9	14,243.2	12,695.3
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change			161.7	73.0	1,499.2
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			(223.1)	(148.2)	(82.5)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change			14,205.5	14,168.0	14,112.0
Liability for Future Policy Benefit, Expected Net Premium, Issuance		1,157.2	1,075.3	1,054.9
Liability for Future Policy Benefit, Expected Net Premium, Interest Income		638.4	637.0	584.0
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected		(1,655.8)	(1,597.9)	(1,537.4)
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change		47.7	(15.5)	29.7
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance end of period		14,393.0	14,266.9	14,243.2
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax		23.5	(336.3)	174.6
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period		14,416.5	13,930.6	14,417.8
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, balance beginning of year		48,920.1	52,423.6	48,929.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of year		50,778.2	51,305.7	49,689.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change			715.9	(248.5)	1,702.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			(247.8)	(336.1)	(310.8)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change			51,246.3	50,721.1	$ 51,080.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance	[6]	3,164.6	3,082.0	3,072.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense		2,261.8	2,253.1	2,227.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment		(5,276.7)	(5,215.2)	(5,236.1)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change		242.5	(62.8)	162.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period		51,638.5	50,778.2	51,305.7
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax		(955.4)	(1,858.1)	1,117.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of period		50,683.1	48,920.1	52,423.6
Liability for Future Policy Benefit, before Reinsurance, before Other		36,266.6	34,989.5	38,005.8
Liability for Future Policy Benefit, Other	[7]	1,562.1	1,591.7	1,753.3
Liability for Future Policy Benefit, before Reinsurance, after Other		37,828.7	36,581.2	39,759.1
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance		10,318.3	7,038.7	7,756.1
Liability for Future Policy Benefit, after Reinsurance		27,510.4	29,542.5	32,003.0
Gross premiums or assessments		10,504.5	10,107.5	9,690.7
interest accretion		1,623.4	1,616.1	1,643.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance		102,714.2	103,434.1	105,325.8
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance		39,495.6	39,338.5	38,761.5
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance		$ 26,215.9	$ 25,929.1	$ 25,552.9
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate		5.00%	4.90%	4.80%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate		5.10%	5.30%	4.80%
Liability for Future Policy Benefit, Weighted-Average Duration		11 years 2 months 12 days	11 years 4 months 24 days	11 years 6 months
Future Policy Benefits		$ 38,017.0	$ 36,806.4	$ 40,009.4

[1] 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.

[2] 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 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 for Closed Block - All Other represents new claim incurrals.

[5] 2Other for Closed Block - All Other primarily includes our closed block group pension products and certain of our ceded closed block individual life products.

[6] 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.

[7] 2Other primarily relates to our Closed Block - All Other product line.