[Tetrarch]

The US government aren’t much help...

https://www.usa.gov/visitors-driving specifies the rules but sends you to the State licensing.

Searching for “IDP” takes you to a FAQ page

“Visiting from another country?
Visitors to Florida who wish to drive while here are required to have in their immediate possession a valid driver license issued in his or her name from their country of residence.

If renting a car while visiting Florida, we suggest you check with the rental car company prior to your visit to see what they require. However, it’s our understanding that rental car companies have not changed their procedures or requirements for having a valid driver license from any state, U.S. territory or foreign country.“

It’s no wonder there is confusion.

Regards

Gary

PS - I have no intention of getting an IDP unless the day after I read a story of a UK driver being refused car hire