Consuming a webservice that requires a Float

Hi, Doing some testing with Mx6.6 and encounter the issue that one of the web services that I need to consume (and is out of my control) requires a Float value (when importing it, it shows datatype Float for one of it attributes). Mx6 deprecates Float and requires Decimals. How to properly handle this? Thanks.

EDIT: toString($Attribute/Decimal) seems to be allowed as a value.