A document that states that a company is in favour of fair employment practices is most likely a:

A document that asserts a company's commitment to fair employment practices is best categorized as a policy document. Policies typically outline an organization's principles and values, setting the framework for its stance on various issues, including employment practices.

In this case, the policy document would explicitly state the company’s dedication to fair treatment, non-discrimination, and equal opportunity, reflecting its ethical position and commitment to fair employment. Such documents are designed to guide employee conduct and inform stakeholders about the company's standards and practices.

Other types of documents, such as process documents, focus on the specific methods or actions taken to achieve goals, while procedure documents outline detailed steps to follow in carrying out those processes. Compliance documents, on the other hand, are related to adherence to laws and regulations but do not necessarily articulate a company’s broader values or commitments as a policy does. Therefore, the function and content of a policy document align precisely with the intent of promoting fair employment practices.