Easiest Way to find out.
-- For digits
Select Left(COLUMN_NAME, Case When CharIndex('.',COLUMN_NAME) = 0 Then 0 Else CharIndex('.',COLUMN_NAME)-1 END) as 'LeftPortion',
   RIGHT(COLUMN_NAME, len(COLUMN_NAME) - CharIndex('.',COLUMN_NAME)) as 'RightPortion' From TABLE_NAME
--To find Max Lengths
Select COLUMN_NAME, MAX(LEN(Left(COLUMN_NAME, Case When Ind = 0 Then 0 Else Ind-1 END))) as LenBeforedecimal , MAX(LEN(Right(COLUMN_NAME, LEN(COLUMN_NAME) - Ind))) as afterdecimal From
(Select COLUMN_NAME, CHARINDEX('.', Cast(COLUMN_NAME as varchar(30))) as Ind From TABLE_NAME) a
Group BY COLUMN_NAME