If the Base is loose with respect to the Floor you should try tighten the nuts at the bottom of the Base.
If the nuts do not tighten then the bolts have loosened in the floor in which case you will have to remove the toilet and rebed the bolts. The wood in the floor may have lost its integrity due to a slow leak.
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Sean
If Ain't a Newell, It Ain't Wurt Oonin!
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