The Allstate Corp has agreed to buy San Francisco and London-based SquareTrade, a consumer protection plan provider, for about $1.4 billion. The sellers included Bain Capital Private Equity and Bain Capital Ventures. The deal is expected to close in January 2017. Ardea Partners, Lazard and Willkie Farr & Gallagher advised Allstate in the transaction while Financial Technology Partners and Ropes & Gray advised SquareTrade.