As interest rates have decreased, insurers were forced to invest in ever lower-yielding assets, reducing the profits that float generates.

Source: https://seekingalpha.com/article/4640836-berkshire-hathaway-the-soaring-value-of-the-float?source=feed_all_articles

As lower-yielding securities in the fixed income portfolio mature, firms can reinvest the proceeds at higher interest rates and increase total investment income.”

Source: https://www.etftrends.com/portfolio-strategies-channel/insider-buying-accelerates-important-sector/

Generally speaking, lower-yielding investments are the exact opposite.

Source: https://seekingalpha.com/article/4598189-investing-for-growth-income?source=feed_all_articles