LONDON—Jacques Rogge, who oversaw an era of political and financial stability in the Olympic movement after its worst ethics scandal and pursued a hard line against doping during his 12 years as IOC president, has died, the Olympic organization said Sunday. He was 79. The International Olympic Committee announced his death without giving details. Rogge’s health had visibly declined when he attended Olympic events since his presidency ended in 2013. “First and foremost, Jacques loved sport and being with athletes — and he transmitted this passion to everyone who knew him,” Thomas Bach, Rogge’s successor as president, said in an IOC statement. “His joy in sport was infectious.” Rogge, a former orthopedic surgeon from Belgium, guided the IOC through a period of relative calm and prosperity during a term that spanned three Summer Olympics and three Winter Games from 2001 to 2013. A three-time Olympian in sailing, Rogge earned praise …