NEW YORK (Bloomberg) — Hartford Financial Services Group Inc., the sixth-largest US insurer by market value, will record a $99 million pretax cost in the second quarter after losing an arbitration ruling over reinsurance obligations.The dispute stemmed from a reinsurer that ITT Corp. established before Hartford was spun off from the conglomerate in 1995, chief financial officer David Johnson said yesterday. Because of the cost, the Hartford, Connecticut-based company will record an underwriting loss of as much as $125 million in the "other operations" category of its property and casualty segment, Johnson said.