European shares swung between gains and losses on Monday with the benchmark stock index Europe 600 jumping towards the strongest level in more than five-and-half year. The Stoxx 600 gauge slid 0.1% to 327.49 as of 8:11 a.m. London time and it has advanced 0.7% in December, while last week the index gained 2% after the IMF signalled it may raise growth outlook of the U.S.