"The Actuarial Science Program at Illinois, housed in the Department of Mathematics, curriculum reflects the interdisciplinary nature of actuarial science, allowing students to receive not only essential actuarial training, but also to take a variety of courses in mathematics, statistics, economics, finance and computer science." from Actuarial Science, Department of Mathematics, University of Illinois at Urbana-Champaign
Books on actuarial science can be found in the Mathemathics Library Stacks on the upper level shelved under call number 368 and in other locations.
"An actuary is a combination of business executive, mathematician, financier, sociologist, and investment manager. Actuaries are problem solvers who use actuarial science to define, analyze, and solve the financial, economic, and other business applications of future events. . . .
Trained to analyze uncertainty, risk, and probabilities, actuaries create and manage programs which will reduce the adverse financial impact of the expected and unexpected things that happen to people and businesses. These programs focus on areas such as life, health, property, casualty, and investment possibilities. . . .
While actuaries work on all sorts of projects in diverse business environments, they have one thing in common: they use quantitative skills to analyze and plan for future financial situations. This broad involvement in business has taken actuaries well beyond the traditional mathematician's role and placed them in an environment where they must be aware of economic, legislative, and social developments which will affect their company and clients. Their comprehensive understanding of both financial and technical intricacies makes them the most influential of professionals, whose work affects virtually every industry in existence." from "What is an Actuary?" Department of Mathematics, University of Illinois. Wed. 10 June 2015.
For more information, check out the Occupational Outlook Handbook: Actuaries page.