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Insurance Liabilities - Claims Development Tables (Details) $ in Millions	Dec. 31, 2021 USD ($) claim	Dec. 31, 2020 USD ($)	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 ($)	Dec. 31, 2012 USD ($)
Claims Development
Total outstanding liabilities for unpaid claims net of reinsurance	$ 1,372.3
Long-Term Disability/Group Life Waiver
Claims Development
Net incurred claims	2,192.6
Net cumulative paid claims	1,215.6
Liability for unpaid claims net, not separately presented	242.0
Total outstanding liabilities for unpaid claims net of reinsurance	1,219.0
Long-Term Disability/Group Life Waiver | Incurral year 2012
Claims Development
Net incurred claims	172.2	$ 173.1	$ 171.9	$ 173.3	$ 174.8	$ 181.8	$ 189.5	$ 191.1	$ 200.0	$ 217.9
Incurred but not reported claims	$ 0.1
Cumulative number of reported claims | claim	6,445
Net cumulative paid claims	$ 136.3	131.5	126.1	120.0	112.9	104.6	93.7	80.8	55.1	$ 13.8
Long-Term Disability/Group Life Waiver | Incurral year 2013
Claims Development
Net incurred claims	174.5	173.4	177.1	179.5	182.3	190.7	188.4	203.3	219.3
Incurred but not reported claims	$ 0.1
Cumulative number of reported claims | claim	7,051
Net cumulative paid claims	$ 134.9	129.0	123.2	116.4	106.4	97.0	81.4	55.0	$ 12.5
Long-Term Disability/Group Life Waiver | Incurral year 2014
Claims Development
Net incurred claims	199.3	202.0	201.9	206.2	218.1	214.4	231.4	242.2
Incurred but not reported claims	$ 0.1
Cumulative number of reported claims | claim	7,603
Net cumulative paid claims	$ 147.2	140.8	132.4	122.3	111.8	96.3	66.0	$ 16.1
Long-Term Disability/Group Life Waiver | Incurral year 2015
Claims Development
Net incurred claims	211.8	210.0	208.2	215.3	217.2	227.2	231.0
Incurred but not reported claims	$ 0.1
Cumulative number of reported claims | claim	7,180
Net cumulative paid claims	$ 146.5	137.1	126.8	114.6	98.0	67.0	$ 16.9
Long-Term Disability/Group Life Waiver | Incurral year 2016
Claims Development
Net incurred claims	218.7	214.4	219.5	219.4	228.4	229.8
Incurred but not reported claims	$ 0.1
Cumulative number of reported claims | claim	6,163
Net cumulative paid claims	$ 147.2	136.8	124.9	105.6	70.6	$ 16.2
Long-Term Disability/Group Life Waiver | Incurral year 2017
Claims Development
Net incurred claims	245.2	245.8	243.1	239.7	238.4
Incurred but not reported claims	$ 0.1
Cumulative number of reported claims | claim	6,080
Net cumulative paid claims	$ 151.7	135.9	115.0	76.5	$ 17.8
Long-Term Disability/Group Life Waiver | Incurral year 2018
Claims Development
Net incurred claims	239.8	239.2	245.1	239.4
Incurred but not reported claims	$ 5.0
Cumulative number of reported claims | claim	5,763
Net cumulative paid claims	$ 135.7	115.7	79.9	$ 20.1
Long-Term Disability/Group Life Waiver | Incurral year 2019
Claims Development
Net incurred claims	240.4	248.4	255.2
Incurred but not reported claims	$ 7.5
Cumulative number of reported claims | claim	5,917
Net cumulative paid claims	$ 117.5	79.7	$ 19.2
Long-Term Disability/Group Life Waiver | Incurral year 2020
Claims Development
Net incurred claims	231.0	252.1
Incurred but not reported claims	$ 3.6
Cumulative number of reported claims | claim	5,850
Net cumulative paid claims	$ 78.8	20.6
Long-Term Disability/Group Life Waiver | Incurral year 2021
Claims Development
Net incurred claims	259.7
Incurred but not reported claims	$ 97.3
Cumulative number of reported claims | claim	3,271
Net cumulative paid claims	$ 19.8
Dental/Vision/Short-Term Disability/Critical Illness/Accident
Claims Development
Net incurred claims	1,489.7
Net cumulative paid claims	1,416.6
Total outstanding liabilities for unpaid claims net of reinsurance	73.1
Dental/Vision/Short-Term Disability/Critical Illness/Accident | Incurral year 2020
Claims Development
Net incurred claims	$ 663.7	679.8
Cumulative number of reported claims | claim	3,079,517
Net cumulative paid claims	$ 663.2	609.5
Dental/Vision/Short-Term Disability/Critical Illness/Accident | Incurral year 2021
Claims Development
Net incurred claims	826.0
Incurred but not reported claims	$ 49.2
Cumulative number of reported claims | claim	3,564,753
Net cumulative paid claims	$ 753.4
Group Life
Claims Development
Net incurred claims	595.8
Net cumulative paid claims	520.4
Liability for unpaid claims net, not separately presented	4.8
Total outstanding liabilities for unpaid claims net of reinsurance	80.2
Group Life | Incurral year 2020
Claims Development
Net incurred claims	278.2	270.6
Incurred but not reported claims	$ 0.9
Cumulative number of reported claims | claim	6,251
Net cumulative paid claims	$ 276.5	$ 219.3
Group Life | Incurral year 2021
Claims Development
Net incurred claims	317.6
Incurred but not reported claims	$ 27.3
Cumulative number of reported claims | claim	6,274
Net cumulative paid claims	$ 243.9

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Undiscounted amount, after reinsurance, of incurred-but-not-reported (IBNR) liabilities plus expected development on reported claims, for claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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