(Bloomberg) – Assurant Inc., the insurer that sells coverage protecting mobile phones and homes, posted the biggest decline in the S&P 500 Index after third-quarter profit slumped.

The insurer dropped $7.65, or 8.4 percent, to $83.65 at 4:02 p.m. in New York trading, the biggest fall since February. That narrowed the company's advance for the year to 3.9 percent.

Net operating income was $54 million to $66 million, compared with $104 million in last year's third quarter, the New York-based company said late Tuesday in a regulatory filing with preliminary results.

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