Unpaid Claims and Claim Expense Reserves - Incurred and Paid Claims by Accident Year on a Net Basis (Details) $ in Millions	Dec. 31, 2022 USD ($) claim	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Homeowners
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 1,318.3
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	1,257.3
Outstanding prior to 2013	0.0
Prior years paid	0.0
Liabilities for claims and claim adjustment expenses, net of reinsurance	61.0
Homeowners | 2013
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	101.7	$ 101.7	$ 101.7	$ 101.7	$ 101.8	$ 102.3	$ 102.4	$ 104.0	$ 107.5	$ 105.6
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	19,226
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 101.7	101.7	101.7	101.7	101.7	101.5	101.0	99.4	96.6	76.9
Homeowners | 2014
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	106.4	106.4	106.4	106.6	106.6	106.8	109.1	113.5	111.6
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	20,085
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 106.4	106.4	106.4	106.4	106.3	106.1	105.7	103.0	83.3
Homeowners | 2015
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	114.9	114.9	114.9	115.1	114.1	114.4	115.1	111.7
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	18,716
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 114.7	114.7	114.9	114.6	113.3	111.9	109.3	90.7
Homeowners | 2016
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	118.1	117.9	117.9	117.9	117.0	118.6	115.9
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	19,866
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 118.0	117.8	117.7	117.5	115.1	113.2	95.8
Homeowners | 2017
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	130.8	130.8	130.7	132.7	129.8	126.3
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	19,863
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 130.7	130.5	130.0	129.8	128.5	106.8
Homeowners | 2018
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	157.2	158.1	158.9	157.4	166.8
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	21,142
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 157.2	157.4	157.0	152.4	130.5
Homeowners | 2019
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	130.9	132.1	129.9	130.4
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 1.0
Cumulative Number of Reported Claims | claim	17,564
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 130.0	129.1	126.2	103.8
Homeowners | 2020
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	145.4	151.9	155.7
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 1.0
Cumulative Number of Reported Claims | claim	19,699
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 144.0	138.7	106.8
Homeowners | 2021
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	150.7	150.2
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 2.0
Cumulative Number of Reported Claims | claim	16,580
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 146.3	114.9
Homeowners | 2022
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	162.2
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 35.0
Cumulative Number of Reported Claims | claim	13,047
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 108.3
Auto liability
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	1,702.3
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	1,511.1
Outstanding prior to 2013	1.3
Prior years paid	0.0
Liabilities for claims and claim adjustment expenses, net of reinsurance	192.5
Auto liability | 2013
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	147.8	147.7	148.3	148.1	148.0	148.1	150.7	150.7	152.9	153.9
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	47,375
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 147.6	147.5	147.4	147.4	146.8	145.3	140.0	131.2	108.9	62.2
Auto liability | 2014
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	160.0	159.4	159.3	159.4	159.8	159.9	158.5	157.2	155.1
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	49,396
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 160.0	158.8	158.6	157.6	155.8	149.1	139.5	117.5	61.3
Auto liability | 2015
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	178.8	178.9	179.2	178.7	178.3	177.0	172.6	165.5
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	50,637
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 178.3	177.7	176.7	174.5	170.1	158.0	134.5	70.8
Auto liability | 2016
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	189.6	189.2	188.1	186.6	184.6	184.4	180.4
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	52,051
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 189.0	188.1	184.5	177.8	166.8	140.9	73.1
Auto liability | 2017
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	192.9	191.7	189.1	188.6	188.8	188.0
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 1.0
Cumulative Number of Reported Claims | claim	49,017
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 190.8	185.8	179.8	166.6	139.5	70.7
Auto liability | 2018
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	192.0	189.8	192.9	195.3	200.3
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 2.0
Cumulative Number of Reported Claims | claim	47,501
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 188.0	180.7	168.6	141.5	77.5
Auto liability | 2019
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	181.5	176.7	180.1	181.1
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 5.0
Cumulative Number of Reported Claims | claim	46,290
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 170.9	155.5	129.1	69.7
Auto liability | 2020
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	136.3	134.9	137.0
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 8.0
Cumulative Number of Reported Claims | claim	32,054
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 118.2	94.0	51.5
Auto liability | 2021
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	157.8	142.2
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 23.0
Cumulative Number of Reported Claims | claim	34,251
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 112.5	52.9
Auto liability | 2022
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	165.6
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 65.0
Cumulative Number of Reported Claims | claim	29,111
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 55.8
Auto physical damage
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	1,038.0
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	1,027.4
Outstanding prior to 2013	0.0
Prior years paid	0.0
Liabilities for claims and claim adjustment expenses, net of reinsurance	10.6
Auto physical damage | 2013
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	88.4	88.4	88.5	88.5	88.5	88.5	88.6	88.7	88.9	91.4
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	80,923
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 88.4	88.4	88.4	88.5	88.5	88.5	88.5	88.6	88.7	85.1
Auto physical damage | 2014
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	95.2	95.2	95.2	95.2	95.2	95.2	95.4	95.6	95.6
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	87,907
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 95.2	95.2	95.2	95.2	95.3	95.3	95.3	95.4	88.9
Auto physical damage | 2015
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	97.6	97.6	97.6	97.6	97.5	97.6	98.0	99.3
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	87,505
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 97.6	97.6	97.6	97.6	97.6	97.7	97.9	92.1
Auto physical damage | 2016
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	109.5	109.5	109.6	109.6	109.3	109.5	112.4
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	93,234
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 109.5	109.6	109.6	109.6	109.5	109.7	106.5
Auto physical damage | 2017
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	110.6	110.5	110.6	110.5	111.8	115.5
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	91,300
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 110.6	110.6	110.6	110.7	110.8	105.2
Auto physical damage | 2018
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	108.2	108.3	108.3	108.9	109.0
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	94,482
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 108.2	108.3	108.3	109.1	103.6
Auto physical damage | 2019
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	110.0	110.0	110.5	111.6
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ (0.1)
Cumulative Number of Reported Claims | claim	92,198
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 110.1	110.1	110.7	106.2
Auto physical damage | 2020
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	87.1	86.9	87.0
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ (0.3)
Cumulative Number of Reported Claims | claim	68,815
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 87.4	87.6	84.1
Auto physical damage | 2021
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	105.7	105.0
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ (0.3)
Cumulative Number of Reported Claims | claim	72,659
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 105.8	97.3
Auto physical damage | 2022
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	125.7
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ (6.3)
Cumulative Number of Reported Claims | claim	70,086
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 114.6
Specialty health
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	250.4
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	233.5
Outstanding prior to 2013	0.0
Prior years paid	0.0
Liabilities for claims and claim adjustment expenses, net of reinsurance	16.9
Specialty health | 2013
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	75.2	75.2	75.2	75.2	75.2	75.3	75.3	75.3	75.6	76.1
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	454,069
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 75.2	75.2	75.2	75.2	75.2	75.0	75.1	75.1	74.8	56.0
Specialty health | 2014
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	56.0	56.0	56.0	56.0	56.0	56.0	55.9	56.3	59.6
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	337,987
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 56.0	56.0	56.0	56.0	55.9	55.7	55.4	54.9	43.4
Specialty health | 2015
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	30.4	30.4	30.4	30.3	30.3	30.3	30.9	33.3
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	183,433
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 30.4	30.4	30.4	30.3	30.3	30.3	30.4	24.9
Specialty health | 2016
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	11.1	11.1	11.1	11.1	11.1	11.2	12.5
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	67,274
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 11.1	11.1	11.1	11.1	11.1	11.0	5.5
Specialty health | 2017
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	9.6	9.6	9.6	9.6	9.7	10.6
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	63,487
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 9.6	9.6	9.6	9.6	9.4	7.3
Specialty health | 2018
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	12.6	12.7	13.0	13.2	12.9
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	95,208
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 12.6	12.6	12.5	12.1	8.8
Specialty health | 2019
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	9.5	9.6	9.5	10.6
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	72,742
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 9.5	9.5	9.3	7.5
Specialty health | 2020
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	5.7	5.8	6.8
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	43,560
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 5.7	5.6	4.2
Specialty health | 2021
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	17.7	22.8
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 4.8
Cumulative Number of Reported Claims | claim	71,407
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 12.9	2.9
Specialty health | 2022
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	22.6
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 12.0
Cumulative Number of Reported Claims | claim	81,491
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 10.5
Group disability
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	280.6
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	206.7
Outstanding prior to 2013	7.5
Prior years paid	0.0
Liabilities for claims and claim adjustment expenses, net of reinsurance	81.4
Effect of discounting	(12.4)
Discounted net reserves	69.0
Group disability | 2013
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	31.4	31.0	31.1	31.5	31.4	31.7	32.1	29.9	30.8	33.0
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	2,720
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 27.8	27.2	26.2	25.0	23.5	21.5	19.4	16.4	12.5	$ 5.5
Group disability | 2014
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	14.6	14.3	14.7	14.5	14.3	14.4	14.8	13.3	16.3
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	2,862
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 12.7	12.4	12.1	11.7	11.1	10.6	9.9	8.5	$ 3.7
Group disability | 2015
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	14.7	15.2	15.2	14.6	14.7	16.6	19.2	25.3
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.0
Cumulative Number of Reported Claims | claim	3,344
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 18.9	18.6	18.1	17.6	17.2	16.6	14.0	$ 6.8
Group disability | 2016
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	28.1	26.8	26.3	26.0	27.4	28.6	28.5
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.4
Cumulative Number of Reported Claims | claim	3,615
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 22.4	21.8	21.1	20.3	19.3	16.4	$ 8.3
Group disability | 2017
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	24.0	23.3	22.4	22.9	26.0	29.9
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.2
Cumulative Number of Reported Claims | claim	3,900
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 19.4	18.9	18.3	17.9	16.1	$ 8.5
Group disability | 2018
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	23.3	22.7	23.2	26.6	29.8
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.2
Cumulative Number of Reported Claims | claim	4,163
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 19.6	18.9	18.0	16.1	$ 8.4
Group disability | 2019
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	29.9	30.2	33.5	34.5
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.4
Cumulative Number of Reported Claims | claim	4,540
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 24.7	24.3	22.8	$ 11.8
Group disability | 2020
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	34.1	34.3	36.7
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 0.5
Cumulative Number of Reported Claims | claim	4,336
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 25.5	22.7	$ 12.4
Group disability | 2021
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	41.3	37.8
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 1.5
Cumulative Number of Reported Claims | claim	5,084
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 24.0	$ 11.8
Group disability | 2022
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
Incurred Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	39.2
Total of Incurred- But-Not-Reported Liabilities Plus Expected Development on Reported Claims	$ 11.9
Cumulative Number of Reported Claims | claim	3,444
Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net of Reinsurance	$ 11.7