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Stock and Stock-Based Incentive Plans Stock and Stock-Based Incentive Plans Stock and Stock-Based Incentive Plans (Stock-Settled Activity) (Details) - Stock-settled market stock units (MSUs) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
May 31, 2019
May 31, 2018
Feb. 28, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 489,000   509,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 83.83   $ 74.36
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 128,376 202,043  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 98.43 $ 81.86  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (148,000)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 63.97    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 0.00    
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options $ 3.8 $ 1.4