That’s the new minimum hourly wage Detroit plans to guarantee for all full-time city employees under a proposal from Mayor Mary Sheffield. The policy, part of Sheffield’s $3 billion city budget, would ensure municipal workers earn at least $21.45 an hour — about $44,500 annually, which officials say reflects a living wage in the Detroit region. About 900 city employees would receive raises if the plan is approved, with the increases expected to begin in July.