A two-time NHL All-Star, Arnott won the Stanley Cup with the New Jersey Devils in 2000, scoring the championship-winning goal in the second overtime of Game 6.

On January 4, 1998, Arnott was traded to the New Jersey Devils along with Bryan Muir in exchange for Valeri Zelepukin and Bill Guerin.

As a member of the "A Line" on the Devils with Patrik Eliáš and Petr Sýkora, he led the team to the 2000 Stanley Cup championship, scoring the Cup-winning goal at 8:20 of double overtime in Game 6 against the Dallas Stars.

On March 19, 2002, Arnott was traded to the Dallas Stars with Randy McKay in exchange for Joe Nieuwendyk and Jamie Langenbrunner.

[2] On June 19, 2010, Arnott was traded back to his Stanley Cup-winning team, the New Jersey Devils, in exchange for forward Matt Halischuk and a second-round pick in 2011.

[3] On February 28, 2011, Arnott was again traded away from the New Jersey Devils, this time to the Washington Capitals, in exchange for Dave Steckel and a second-round pick in 2012.

Arnott's cousins, Burke and Stacey Dales, were both professional athletes; Burke was a punter for nine seasons in the Canadian Football League who also attended training camp with the Pittsburgh Steelers, and Stacey was a two-time All-American in basketball at the University of Oklahoma who played five seasons in the Women's National Basketball Association and is currently a reporter for NFL Network.