The Count of Floridablanca, apart from being the State Minister in Spain, also held a very important role, that of the executor of Charles III's reform plans.
Charles III, as the last capable king of Spain, vigorously promoted enlightened absolutist reforms, allowing for the spread of Enlightenment ideas within the country, encouraging the development of industry and commerce, and pursuing economic liberalization. At the same time, he dealt a heavy blow to the Church's power, reduced noble privileges, and intensified the exploitation of the colonies to improve domestic welfare in Spain.
It could be said that if Charles III had lived for another few decades, Spain might have still had the chance to ascend. But after his death, Charles IV simply couldn't control the situation. The nobles began to oppose the reforms, and with Godoy manipulating power, Spain quickly fell into decline.