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Policyholder Account Balance (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Policyholder Account Balance [Line Items] |  |  |  |  |  |  |
Policyholders' Account Balances | $ 5,709.6 |  | $ 5,772.3 | [1] | $ 5,740.2 | [2] |
Operating Segments |  |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |  |
Policyholders' Account Balances | 5,709.6 |  | 5,772.3 |  | 5,598.6 |  | $ 5,679.6
Policyholder Account Balance, Reinsurance recoverable | 4,166.1 |  | 4,223.7 |  |  |  |
Policyholder Account Balance, After reinsurance recoverable | $ 1,543.5 |  | $ 1,548.6 |  |  |  |
Policyholder Account Balance, Weighted Average Crediting Rate | 6.90% |  | 6.50% |  |  |  |
Policyholder Account Balance, Net Amount at Risk | $ 15,820.0 | [3] | $ 16,968.3 |  |  |  |
Policyholder Account Balance, Cash Surrender Value | 5,413.5 |  | 5,427.7 |  |  |  |
Policyholder Account Balance, Premium Received | 44.0 |  | 45.7 |  |  |  |
Policyholder Account Balance, Policy Charge | (60.8) | [4] | (64.4) |  |  |  |
Policyholder Account Balance, Surrender and Withdrawal | (24.3) |  | (23.3) |  |  |  |
Policyholder Account Balance, Benefit Payment | (70.5) |  | (74.6) |  |  |  |
Policyholder Account Balance, Interest Expense | 94.0 |  | 90.2 |  |  |  |
Policyholder Account Balance, Increase (Decrease) from Other Change | (15.4) |  | (22.9) |  |  |  |
Policyholder Account Balance, before Reserves in excess of Account Balance | 5,565.6 |  | 5,630.3 |  |  |  |
Policyholder Account Balance, Reserves in excess of Account Balance | 144.0 |  | 142.0 |  |  |  |
Unum US | Voluntary Benefits |  |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |  |
Policyholders' Account Balances | 677.2 |  | 680.6 |  | 586.8 |  | 598.7
Policyholder Account Balance, Reinsurance recoverable | 1.0 |  | 1.2 |  |  |  |
Policyholder Account Balance, After reinsurance recoverable | $ 676.2 |  | $ 679.4 |  |  |  |
Policyholder Account Balance, Weighted Average Crediting Rate | 3.90% |  | 4.60% |  |  |  |
Policyholder Account Balance, Net Amount at Risk | $ 4,794.7 | [3] | $ 5,219.2 |  |  |  |
Policyholder Account Balance, Cash Surrender Value | 572.3 |  | 588.7 |  |  |  |
Policyholder Account Balance, Premium Received | 15.4 |  | 17.2 |  |  |  |
Policyholder Account Balance, Policy Charge | (15.5) | [4] | (16.9) |  |  |  |
Policyholder Account Balance, Surrender and Withdrawal | (9.0) |  | (10.2) |  |  |  |
Policyholder Account Balance, Benefit Payment | (3.0) |  | (3.5) |  |  |  |
Policyholder Account Balance, Interest Expense | 5.7 |  | 6.9 |  |  |  |
Policyholder Account Balance, Increase (Decrease) from Other Change | 2.0 |  | 2.2 |  |  |  |
Policyholder Account Balance, before Reserves in excess of Account Balance | 582.4 |  | 594.4 |  |  |  |
Policyholder Account Balance, Reserves in excess of Account Balance | 94.8 |  | 86.2 |  |  |  |
Colonial Life |  |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |  |
Policyholders' Account Balances | 867.5 |  | 869.5 |  | 852.4 |  | 849.2
Policyholder Account Balance, Reinsurance recoverable | 0.2 |  | 0.3 |  |  |  |
Policyholder Account Balance, After reinsurance recoverable | $ 867.3 |  | $ 869.2 |  |  |  |
Policyholder Account Balance, Weighted Average Crediting Rate | 4.00% |  | 4.00% |  |  |  |
Policyholder Account Balance, Net Amount at Risk | $ 9,182.6 | [3] | $ 9,811.4 |  |  |  |
Policyholder Account Balance, Cash Surrender Value | 805.0 |  | 789.3 |  |  |  |
Policyholder Account Balance, Premium Received | 22.3 |  | 23.4 |  |  |  |
Policyholder Account Balance, Policy Charge | (19.0) | [4] | (20.0) |  |  |  |
Policyholder Account Balance, Surrender and Withdrawal | (10.2) |  | (10.0) |  |  |  |
Policyholder Account Balance, Benefit Payment | (2.2) |  | (2.3) |  |  |  |
Policyholder Account Balance, Interest Expense | 8.6 |  | 8.5 |  |  |  |
Policyholder Account Balance, Increase (Decrease) from Other Change | (0.2) |  | 0.1 |  |  |  |
Policyholder Account Balance, before Reserves in excess of Account Balance | 851.7 |  | 848.9 |  |  |  |
Policyholder Account Balance, Reserves in excess of Account Balance | 15.8 |  | 20.6 |  |  |  |
Closed Block | Other Insurance Product Line |  |  |  |  |  |  |
Policyholder Account Balance [Line Items] |  |  |  |  |  |  |
Policyholders' Account Balances | 4,164.9 |  | 4,222.2 |  | $ 4,159.4 |  | $ 4,231.7
Policyholder Account Balance, Reinsurance recoverable | 4,164.9 |  | 4,222.2 |  |  |  |
Policyholder Account Balance, After reinsurance recoverable | $ 0.0 |  | $ 0.0 |  |  |  |
Policyholder Account Balance, Weighted Average Crediting Rate | 7.90% |  | 7.30% |  |  |  |
Policyholder Account Balance, Net Amount at Risk | $ 1,842.7 | [3] | $ 1,937.7 |  |  |  |
Policyholder Account Balance, Cash Surrender Value | 4,036.2 |  | 4,049.7 |  |  |  |
Policyholder Account Balance, Premium Received | 6.3 |  | 5.1 |  |  |  |
Policyholder Account Balance, Policy Charge | (26.3) | [4] | (27.5) |  |  |  |
Policyholder Account Balance, Surrender and Withdrawal | (5.1) |  | (3.1) |  |  |  |
Policyholder Account Balance, Benefit Payment | (65.3) |  | (68.8) |  |  |  |
Policyholder Account Balance, Interest Expense | 79.7 |  | 74.8 |  |  |  |
Policyholder Account Balance, Increase (Decrease) from Other Change | (17.2) |  | (25.2) |  |  |  |
Policyholder Account Balance, before Reserves in excess of Account Balance | 4,131.5 |  | 4,187.0 |  |  |  |
Policyholder Account Balance, Reserves in excess of Account Balance | $ 33.4 |  | $ 35.2 |  |  |  |
[1] | 2 We previously reported policy and contract benefits and reserves for future policy and contract benefits liabilities in our consolidated balance sheet as of March 31, 2022 of $1,874.2 million and $45,258.0 million, respectively, resulting in total policyholder liabilities of $47,132.2 million. These balances were reclassified into new line items, future policy benefits and policyholders' account balances, which would have reported balances of $41,368.2 million and $5,764.0 million, respectively, as of March 31, 2022, resulting in total policyholder liabilities of $47,132.2 million under the historical accounting method.
[2] | 1 We previously reported policy and contract benefits and reserves for future policy and contract benefits liabilities in our consolidated balance sheet as of December 31, 2022 of $1,839.8 million and $42,330.2 million, respectively, resulting in total policyholder liabilities of $44,170.0 million. These balances were reclassified into new line items, future policy benefits and policyholders' account balances, which would have reported balances of $38,443.2 million and $5,726.8 million, respectively, as of December 31, 2022, resulting in total policyholder liabilities of $44,170.0 million under the historical accounting method.
[3] | 2 For those guarantees of benefits that are payable in the event of death, the net amount at risk is generally defined as the current guaranteed minimum death benefit in excess of the current account balance at the balance sheet date.
[4] | 1 Contracts included in the policyholder account balances are generally charged a premium and/or monthly assessments on the basis of the account balance.

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