Stocks in Europe reversed earlier gains by Thursday's close to finish lower, as investors digested fresh news out of the central banking sphere. The pan-European STOXX 600 closed down 0.15%, with the majority of sectors falling into negative territory. The U.K.'s FTSE 100 slipped 0.43% by the close, while France's CAC 40 ended a touch lower, off 0.08%, and Germany's DAX rose 0.19%.