Australia’s Macquarie Group has struck a deal to buy a portfolio of 90 commercial airliners for $4 billion, bolstering its aircraft-leasing business and further diversifying away from its investment banking roots.

The bank said it had agreed to buy the aircraft from Awas Aviation Capital, owned by private equity firm Terra Firma and the Canada Pension Plan Investment Board. To help fund the purchase, Macquarie said it planned to raise as much as 500 million Australian dollars ($391 million) by issuing new shares.