convert from Single to Decimal

Hello everyone,

I think convert from Single or Double to Decimal is always fine since Decimal has broader precision and broader range. Why it is mentioned,

"Conversions from Single or Double to Decimal throw an OverflowException if the result of the conversion is not representable as a Decimal."

http://msdn.microsoft.com/en-us/library/system.decimal(VS.80).aspx

thanks in advance,
George