KKR, a global investment firm, and Caisse de depot et placement du Quebec , a long-term institutional investor, have announced their joint acquisition of USI Insurance Services , a U.S. insurance brokerage and consulting firm headquartered in Valhalla, N.Y. As partners with equal ownership, KKR and CDPQ will acquire USI from Onex Corporation and its affiliates in a transaction that values USI at $4.3 billion. The investment will primarily be made through KKR and CDPQ's core private equity partnership which includes funds from KKR's balance sheet and from CDPQ's pool of capital.