Robert Sangster's Detroit, who won the 1980 Prix de l'Arc de Triomphe (Fr-I) and later produced 1994 Arc winner Carnegie, died of complications from hemorrhaging after foaling an Entrepreneur filly. The filly was placed on a nurse mare. Detroit died May 20 at Sangster's Swettenham Stud in England.A daughter of Riverman out of the Sunny Boy mare Derna, Detroit was Horse of the Year and champion 3-year-old filly the year of her Arc win. During her career, she won eight of 13 races and earned $494,202 in two years of racing.In addition to Carnegie, Detroit produced stakes winners Lake Erie, Antisaar, and Honfleur, plus stakes-placed Wayne County. Lake Erie was an English group winner. Carnegie, the first of two Arc winners by Sadler's Wells, earned $1.4 million during his career.Sangster bought Detroit as a yearling privately from her breeder, Societe Aland, a breeding partnership of Alec Head and Comte Roland de Chambure. Detroit's 5-year-old daughter, Valencay (by Sadler's Wells), is a member of Sangster's broodmare band and is the dam of a Zafonic yearling colt.