According to the news source, the UK segment's operating income dropped 19.6 percent during the first quarter to $48.7 million.
The Wall Street Journal reports that the company's overall first quarter earnings decreased 1.9 percent, continuing a string of recent sub-par quarters. High jobless numbers have reportedly hurt the company, which sells disability insurance to workers, the news source said.
Earnings in the company's US business reportedly grew by 5 percent, with its premium income increasing 0.3 percent, according to the news provider.
Overall, the company posted a profit of $225.4 million, down from last year's total of $229.8 million.
In addition to the high unemployment rate, Unum has been dogged by a number of insurance lawsuits, with plaintiffs claiming they were unfairly denied disability benefits.