Nearly 3,600 Sikorsky Aircraft union workers in Connecticut and Florida went on strike Monday.

Workers with Local 1150 of the Teamsters rejected the company?s contract offer Sunday. Union officials say the offer would have doubled health care co-payments in the first year. They say health insurance premiums and prescription drug costs would have also gone up under the contract.

Sikorsky officials believe the contract was a good offer, with 3.5 pay raises each year in the three-year deal. They add the offer also included pension improvements and a $2,000 ratification bonus. Workers blame the increased health care costs for the rejection of the contract and the strike.

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