"They are offering billions of dollars more than the Conservative government had put on the table."
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Actually no they aren't.

The Conservatives were offering increases tied to nominal GDP with a minimum of 3%.  The Liberals are offering a straight 3.5%.  Since nominal GDP was expected to grow at about 4% per year on average the Conservatives deal would probably have resulted in larger increases on average, though the Liberal deal had more consistent and certain increases.

The only place where the Liberals were offering more was the new home and mental health care, though even there we're only talking about roughly $1.0B/year.

On the whole the total dollar value is a wash between the Liberal and Conservative plans, just calculated slightly differently.