It's the 1980s all over again! KKR has formally approached drugstore giant Walgreens Boots about a deal to take the company private in what would be the largest leveraged buyout ever, according to reports. Both companies refused to comment. The New York-based private equity firm has been preparing a proposal to potentially buy out shareholders of Walgreens Boots, said sources, who asked not to be identified because discussions are private. It’s unclear how feasible the transaction would be,...