NEW YORK — The U.S. dollar extended gains against key currencies on Wednesday after the release of minutes from last month's Federal Reserve meeting, while world shares smashed records on investor optimism in the new year.

The U.S. dollar index rose 0.33 per cent, with the euro down 0.36 per cent to US$1.2013.

The euro fell to a session low versus the U.S. dollar after the release of minutes from last month's Federal Reserve meeting. During the meeting, Fed policy makers decided to raise short-term interest rates for a third time in 2017.

According to the minutes, policymakers showed worry over the fate of currently low inflation and saw recent tax changes as providing a boost to consumer spending.

"I would say there's a little bit of a hawkish tilt in the minutes here," said Charlie Ripley, senior investment strategist at Allianz Investment Management in Minneapolis.

"If you think about some of the stuff from the previous statement, there wasn't a ton of change. Really, I think the discussion is centered around the inflation topic."

The U.S. dollar had already snapped a three-week losing streak earlier on Wednesday, after stronger-than-forecast U.S. manufacturing and construction data.

The Japanese yen weakened 0.21 per cent versus the greenback at 112.53 per U.S. dollar, while Sterling was last trading at US$1.3512, down 0.54 per cent on the day.

Benchmark U.S. Treasury 10-year notes last rose 5/32 in price to yield 2.4471 per cent, from 2.465 per cent late on Tuesday.

The 30-year bond last rose 16/32 in price to yield 2.7855 per cent, from 2.81 per cent late on Tuesday.

Hawkish comments from two European Central Bank officials sent yields higher on Tuesday, with the 10-year German Bund yield hitting a two-month peak and the five-year U.S. yield reaching its highest level since April 2011.

STOCKS HOLD GAINS

MSCI's gauge of stocks, which tracks shares in 47 countries, gained 0.40 per cent. In 2017, the index's best year since 2009, it set scores of record highs and rose by one-fifth in value.

U.S. equities also climbed to fresh highs on Wednesday, propelled by tech stocks. The benchmark S&P 500 breached the 2,700-mark for the first time, while the Nasdaq Composite and the Dow Jones Industrial Average also broke records.

Wall Street held its gains after the release of minutes from the Fed's policy meeting last month.

"It emphasizes the message they've had out there, that they'll be data dependent and that they want to try to normalize policy unless there's an economic slowdown or inflation doesn't act as expected," said Sameer Samana, global equity and technical strategist at Wells Fargo Investment Institute in St. Louis.

The Dow Jones Industrial Average rose 63.51 points, or 0.26 per cent, to 24,887.52, the S&P 500 gained 14.59 points, or 0.54 per cent, to 2,710.4 and the Nasdaq Composite added 53.77 points, or 0.77 per cent, to 7,060.67.

Technology companies Oracle (ORCL.N) and IBM (IBM.N) rose 2.43 per cent and 2.87 per cent, respectively, following brokerage upgrades. The shares helped boost the S&P technology index 0.93 per cent.

Tuesday, the first day of trading in 2018, saw a strong start for the indices, with the S&P and the Nasdaq hitting record closing highs.

In Europe, shares closed higher on Wednesday after a rising U.S. dollar boosted exporters and Wall Street records lifted optimism as new European market rules took hold. The pan-European STOXX 600 index was up 0.48 per cent.

Meanwhile, MSCI's broadest index of Asia-Pacific shares outside Japan closed 0.47 per cent higher as manufacturing surveys pointed to a strong start for the European economy.

Emerging market stocks rose 0.58 per cent, and Japan's Nikkei lost 0.08 per cent.

Elsewhere, spot gold reached its highest since mid-September on Wednesday, before edging back to US$1,312.51 per ounce.

Oil prices hit fresh two-and-a-half year highs as strong output in the United States and Russia balanced tensions from a sixth day of unrest in OPEC member Iran.

U.S. crude rose 2.2 per cent to US$61.70 per barrel and Brent was last at US$67.83, up 1.89 per cent on the day.