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Other	3 Months Ended
Other	Mar. 31, 2024
Other Disclosures [Abstract]
Allowance for Expected Credit Losses on Premiums Receivable	Allowance for Expected Credit Losses on Premiums Receivable At March 31, 2024 and December 31, 2023, the allowance for expected credit losses on premiums receivables was $30.0 million and $29.5 million, respectively, on gross premiums receivable of $676.9 million and $612.4 million, respectively. The increase in the allowance of $0.5 million during the three months ended March 31, 2024 was driven primarily by an increase in premium due to be collected in the Unum US segment. At March 31, 2023 and December 31, 2022, the allowance for expected credit losses on premiums receivables was $31.6 million and $32.5 million, respectively, on gross premiums receivable of $635.6 million and $557.6 million, respectively. The decrease in the allowance of $0.9 million during the three months ended March 31, 2023 was driven primarily by improvements in the age of premiums receivable.