MANCHESTER, England — Prime Minister Boris Johnson of Britain insisted on Wednesday that he loved Europe, even as he presented officials in Brussels with a new, detailed plan to pull his country out of the European Union by the end of this month.

Mr. Johnson said Britain was offering a “reasonable compromise” on the vexing question of Ireland, and Brussels said it would study his proposal. But the swift, negative response of Ireland’s leaders suggested it would not draw the two sides any closer to an amicable divorce.

Speaking at the Conservative Party conference in Manchester, Mr. Johnson mixed a defiant appeal to the Brexiteers in his party with a conciliatory tone toward Brussels. He asked the European Union to compromise, too, he said, asserting that an orderly British exit could open a promising new relationship with Europe.

“It cannot be stressed too much that this is not an anti-European party, and it is not an anti-European country,” Mr. Johnson said. “We love Europe. We are European.” When the audience fell silent, an abashed prime minister added, “At least, I love Europe.”