Format Results Of Division

I have a function that divides the results of 2 seperate datafiffs to provide a ratio. For some reason I cannot get the result to return as a decimal - it is only giving me integers. I have tried cast and converting both the idividual numbers and the results, no luck. If I write the query on it's own, casting the one of the values as decimal will return the right value. Any ideas what I am missing? Here is the function:



Create function fn_FTE(
@tkpr varchar(5),
@start datetime,
@end datetime)

Returns decimal
Begin
declare

@fte decimal


select @fte =

sum(datediff(dd,
(case
when eedatebeg < @start then @start
else eedatebeg
end),
(case
when eedateend > @end then @end
when eedateend is null then @end
else eedateend
end))) /datediff(dd,@start,@end)

from vw_employ_dates
where
eedatebeg < @end
and (eedateend > @start or eedateend is null)
and eudescrip = @tkpr


return @FTE
end


thanks for any help!