Aetna exec takes CEO role at The Hanover; Compre restructures; Fidelis appoints CIO; S&P: reinsurers to pick up at least 50% of wildfire losses; RFIB launches Americas business; Fitch: Brexit scenario impact uncertain; XL Catlin hires Newick; RMS opens Florida office; PwC issues casualty reserves warning; RSA appoints underwriting director; AM Best affirms PartnerRe after review; XL Catlin announces $1bn share buyback; $460mn Chinese reinsurer in pipeline; Validus COO to lead US MGU; MPL profitabili