Stock-Based Employee Compensation (Details 2) - USD ($) $ in Millions |
12 Months Ended | ||
---|---|---|---|
Feb. 28, 2017 |
Feb. 29, 2016 |
Feb. 28, 2015 |
|
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | |||
Fair value of stock options vested | $ 20.3 | $ 20.1 | $ 19.6 |
Intrinsic value of stock options exercised | 260.4 | 514.9 | 185.8 |
Tax benefit realized from stock options exercised | $ 106.0 | $ 193.5 | $ 62.2 |