NEW YORK - Nippon Steel has completed its $14.2 billion takeover of US Steel, the company announced on Wednesday, capping a year and half of fraught negotiations and resulting in a landmark deal for a president who originally opposed the deal.

The agreement includes a "golden share" arrangement that gives President Donald Trump final say over key parts of the company's US business, including plant closures, headquarters location and employee salaries, as a way to ease earlier national security concerns.

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Nippon, a Japanese steel giant, bought all shares of US Steel for $55 apiece, valuing the transaction at $14.2 billion, corporate filings show. The company also plans to invest an additional $11 billion in its US operations by 2028. Combined, the new company will become the world's second-largest steelmaker.