How are the Google Cloud Natural Language API Sentiment Analysis outputs interpreted?

I am trying to get a better understanding of the outputs given by Google’s sentiment analysis API. It takes in a sentence and gives out two values – magnitude and score. I am trying to interpret the magnitude value better. Magnitude is defined in the documentation as –

A non-negative number in the [0, +inf) range, which represents the absolute magnitude of sentiment regardless of score (positive or negative).

Initially, I thought it is a confidence score or weight but I am not sure how the value would change since it can be ANY number. Does anybody know how it is calculated or what it means apart from the definition provided in the documentation?