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LOS ANGELES – British actor Idris Elba is having what he describes as a “beautiful moment” in his career. His off-screen life, though, is another story.

This summer, Elba starred in Guillermo del Toro’s special-effects action thriller “Pacific Rim,” in which he transformed the rather moldy line, “We are canceling the apocalypse,” into something akin to Shakespeare.

The third season of his acclaimed British detective series, “Luther,” for which he won a Golden Globe in 2012, recently aired on BBC America, and he’s reprising his role of Heimdall, the buff, Asgardian warrior-god gatekeeper, in “Thor: The Dark World.”

And he’s garnering rave reviews and awards buzz for his complex performance as the late Nelson Mandela, the legendary South African leader who helped end apartheid, in the new biographical drama “Mandela: Long Walk to Freedom.” But during a recent interview, the 41-year-old Elba admitted he’s “numb” to the attention and praise.

“It’s weird at the moment,” the strikingly handsome actor said recently over lunch at the Mondrian hotel on Sunset Boulevard.

“My dad died eight, nine weeks ago,” he said, quietly. “He was 76. He died of lung cancer. I am having to deal with grief and it has taken a profound effect on me.”

Elba doesn’t want to sound ungrateful for his professional good fortune. “I put on a smile, put on the suits and I go on the red carpet. I do the work, and I’m doing it because that is what my old man would want me to do. He was very proud of me.”

The actor, who is an only child, used his father, Winston, as the basis for his performance. His father immigrated to London from Sierra Leone; his mother, Eva, is from Ghana.

Though from different African countries, Elba said, his father and Mandela had the same cadence in their speech. There were other similarities in their behaviors, from the way they crossed their legs to holding their fingers while talking, which helped him immeasurably in bringing Mandela to life. “My dad had a big silver ball of hair and Mandela has that, so that was my framework,” he said.

Elba, who exudes as much charisma in person as he does on screen, made his first impression on American audiences in 2002 with his explosive performance as Stringer Bell, the aspirational second-in-command to a Baltimore drug kingpin in HBO’s award-winning series “The Wire.”

Over the last decade, the actor has appeared in numerous films and TV series including NBC’s “The Office” (he played a rival to Steve Carell’s regional manager), the 2007 Tyler Perry melodrama “Daddy’s Little Girls,” as well as Ridley Scott’s 2007 “American Gangster” and 2012’s “Prometheus.”

He’s also moonlights as a DJ. “I am hired specifically for my hard, progressive house music,” said Elba. “It’s so different from this world. Nobody cares about who I am when I am out playing the music. It really grounds me. It’s a side of my creativity I can’t let go of.”

A singer and songwriter, Elba just recorded an album in South Africa inspired by his experience making the movie in the country. “I call it character music,” Elba said. “It’s the first time of really marrying what I do in the film with the music.”

At first, Idris, who plays Mandela from his 20s through his late 70s, was reluctant to take on the role of the lawyer and anti-apartheid activist, who spent 27 years in prison before becoming the country’s first democratically elected president.

Not only did he feel he was too young to play the role, “I am actually four shades too dark,” said Elba.

But director Justin Chadwick had an instinct about Elba.

“He’s a subtle actor that totally inhabits a role,” said Chadwick in an email. “The producers had imagined I’d cast a Hollywood star, but I loved that Idris carried no baggage into whatever role he plays. We weren’t going for a look-alike version, but wanted to catch the spirit of the man.”

Elba, Chadwick added, “is a true gentle man, very warm and generous. He is also fearless. And that’s how people described Mandela the young man to me.”