As you recall, this is the way home: Florence to Milan, then Milan to Lyon, then Lyon to Paris (unless I could find a way to Paris from Milan) then once in Paris, I'd be at the North Station, and take the RER B to Charles de Gaulle Airport (2nd stop) then take the Shuttle bus to Gate 2A, and that's where I'd get my ticket. We're headed to the train station in Florence right now.