The Antarctic Ice Sheet is on land, not floating in the ocean. Actually, it is dipping its toes in the sea, but the majority of the ice is on land. (Antarctica's glaciers end in floating ice shelves that extend into the ocean.)
Thus, the vast majority of the ice is not currently displacing water and will raise sea level when it melts and flows into the ocean. Fascinating side note: Land in West Antarctica is already rising up where the ice cover has retreated. Called glacial rebound, this phenomenon is still taking place in North America, where the land is recovering from the weight of the massive ice sheets that covered the continent during the last ice age.
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