Marsh & McLennan Cos. Inc. on Thursday reported higher revenue and profit in the second quarter of 2018, with operations in the United States leading the growth for its core insurance and reinsurance brokerage business.

In addition, the world’s largest brokerage continued its previously announced restructuring effort in the second quarter, which includes eliminating management layers.

Marsh & McLennan, which owns units offering insurance and reinsurance broking, benefits consulting and management consulting, reported revenue of $3.73 billion for the second quarter of 2018, a 6.8% increase over the same period last year. On an underlying basis, revenue increased 3%.

In the first quarter of 2018, Marsh & McLennan adopted new accounting rules from the Financial Accounting Standards Board that affect when certain revenues are recognized in financial results. For all its businesses, it gave comparable increases on an underlying basis excluding the accounting change and the effect of mergers and acquisitions, in addition to percentage increases that reflect the change.

Net income increased to $531 million, a 6% increase over the same period last year.

Risk and insurance services revenue, which includes the operations of its main insurance brokerage unit Marsh L.L.C. and its reinsurance brokerage Guy Carpenter & Co. L.L.C., was $2.1 billion in the 2018 second quarter, up 5% on an underlying basis from the prior-year period. Both Marsh and Guy Carpenter grew 5% on an underlying basis, with Marsh reporting revenue of $1.75 billion and Guy Carpenter $332 million.

Marsh saw strong growth in the U.S. and Canada, with underlying revenue increasing 8% to $941 million. Its operations in Europe, the Middle East and Africa reported revenue of $526 million, up 1% on an underlying basis; Asia-Pacific reported revenue of $183 million, up 6%; and Latin American revenue increased 3% to $99 million.

Marsh made several acquisitions in the quarter, including Houston-based Wortham Insurance & Risk Management.

Three acquisitions by its Marsh & McLennan Agency L.L.C. unit, which focuses on middle-market commercial policyholders, added $15 million in annual revenue.

“We continue to see opportunity for smaller, fold-in transactions in addition to the other mid-sized M&A we have executed in the past,” said Dan Glaser, president and CEO of Marsh & McLennan, said on a Thursday conference call with analysts.

During the second quarter, Marsh incurred $55 million in restructuring costs and expects to incur between $80 million and $100 million in total costs related to the effort, Mr. Glaser said.

The restructuring will result in a simplified structure with fewer layers of management, said John Q. Doyle, president and CEO of Marsh.

“We expect to be simpler, more agile, and we are pushing decision-making authority closer to the client,” he said.

In addition, “the effort is also about enabling us to accelerate some investments in support of our strategy,” Mr. Doyle said. “The areas of investments are digital capabilities, data and analytics, strengthening our middle market or corporate accounts value proposition. We are going to be adding some talent in key growth areas and we also expect to continue to invest in our (managing general agency) operation.”

For the first six months of 2018, Marsh & McLennan revenue increased to $7.73 billion, a 10.5% increase, or 4% on an underlying basis. Net income was $1.22 billion, up 14.1%.