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Future Policy Benefits and Claims - Claims Development Tables (Details) $ in Millions | Dec. 31, 2023 USD ($) claim | Dec. 31, 2022 USD ($) | 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 ($) | Dec. 31, 2014 USD ($)
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Claims Development |  |  |  |  |  |  |  |  |  |
Total outstanding liabilities for unpaid claims net of reinsurance | $ 1,401.5 |  |  |  |  |  |  |  |  |
Long-Term Disability/Group Life Waiver |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 2,300.7 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | 1,314.6 |  |  |  |  |  |  |  |  |
Liability for unpaid claims net, not separately presented | 251.8 |  |  |  |  |  |  |  |  |
Total outstanding liabilities for unpaid claims net of reinsurance | 1,237.9 |  |  |  |  |  |  |  |  |
Long-Term Disability/Group Life Waiver | Incurral year 2014 |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 200.7 | $ 199.8 | $ 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 | 7,610 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 158.5 | 153.3 | 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 | 208.3 | 210.5 | 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 | 7,184 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 160.3 | 154.0 | 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 | 219.0 | 221.9 | 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 | 6,171 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 165.3 | 157.1 | 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 | 248.9 | 246.5 | 245.2 | 245.8 | 243.1 | 239.7 | 238.4 |  |  |
Incurred but not reported claims | $ 0.1 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | claim | 6,091 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 176.8 | 165.4 | 151.7 | 135.9 | 115.0 | 76.5 | $ 17.8 |  |  |
Long-Term Disability/Group Life Waiver | Incurral year 2018 |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 238.0 | 235.3 | 239.8 | 239.2 | 245.1 | 239.4 |  |  |  |
Incurred but not reported claims | $ 0.1 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | claim | 5,782 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 163.3 | 150.3 | 135.7 | 115.7 | 79.9 | $ 20.1 |  |  |  |
Long-Term Disability/Group Life Waiver | Incurral year 2019 |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 238.6 | 240.2 | 240.4 | 248.4 | 255.2 |  |  |  |  |
Incurred but not reported claims | $ 0.1 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | claim | 5,961 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 150.6 | 136.4 | 117.5 | 79.7 | $ 19.2 |  |  |  |  |
Long-Term Disability/Group Life Waiver | Incurral year 2020 |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 217.7 | 221.1 | 231.0 | 252.1 |  |  |  |  |  |
Incurred but not reported claims | $ 5.8 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | claim | 5,939 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 130.0 | 113.1 | 78.8 | $ 20.6 |  |  |  |  |  |
Long-Term Disability/Group Life Waiver | Incurral year 2021 |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 221.6 | 244.5 | 259.7 |  |  |  |  |  |  |
Incurred but not reported claims | $ 8.5 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | claim | 5,571 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 113.2 | 79.0 | $ 19.8 |  |  |  |  |  |  |
Long-Term Disability/Group Life Waiver | Incurral year 2022 |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 240.5 | 274.3 |  |  |  |  |  |  |  |
Incurred but not reported claims | $ 4.1 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | claim | 5,572 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 76.6 | 19.6 |  |  |  |  |  |  |  |
Long-Term Disability/Group Life Waiver | Incurral year 2023 |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 267.4 |  |  |  |  |  |  |  |  |
Incurred but not reported claims | $ 111.8 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | claim | 3,353 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 20.0 |  |  |  |  |  |  |  |  |
Dental, Vision, STD, Critical Illness, Accident, Hospital Indemnity and PFML |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 1,942.9 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | 1,863.8 |  |  |  |  |  |  |  |  |
Total outstanding liabilities for unpaid claims net of reinsurance | 79.1 |  |  |  |  |  |  |  |  |
Dental, Vision, STD, Critical Illness, Accident, Hospital Indemnity and PFML | Incurral year 2022 |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | $ 910.6 | 924.4 |  |  |  |  |  |  |  |
Cumulative number of reported claims | claim | 4,317,802 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 909.8 | 845.5 |  |  |  |  |  |  |  |
Dental, Vision, STD, Critical Illness, Accident, Hospital Indemnity and PFML | Incurral year 2023 |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 1,032.3 |  |  |  |  |  |  |  |  |
Incurred but not reported claims | $ 57.1 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | claim | 4,566,920 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 954.0 |  |  |  |  |  |  |  |  |
Group Life |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 569.0 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | 492.6 |  |  |  |  |  |  |  |  |
Liability for unpaid claims net, not separately presented | 8.1 |  |  |  |  |  |  |  |  |
Total outstanding liabilities for unpaid claims net of reinsurance | 84.5 |  |  |  |  |  |  |  |  |
Group Life | Incurral year 2022 |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 284.2 | 279.3 |  |  |  |  |  |  |  |
Incurred but not reported claims | $ 1.1 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | claim | 6,168 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 277.5 | $ 218.3 |  |  |  |  |  |  |  |
Group Life | Incurral year 2023 |  |  |  |  |  |  |  |  |  |
Claims Development |  |  |  |  |  |  |  |  |  |
Net incurred claims | 284.8 |  |  |  |  |  |  |  |  |
Incurred but not reported claims | $ 33.3 |  |  |  |  |  |  |  |  |
Cumulative number of reported claims | claim | 5,064 |  |  |  |  |  |  |  |  |
Net cumulative paid claims | $ 215.1 |  |  |  |  |  |  |  |  |

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