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Stock and Stock-Based Incentive Plans Stock And Stock-Based Incentive Plans (Cash-Settled Restricted Stock Unit Activity) (Details) - Cash-settled restricted stock units - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
May 31, 2018
May 31, 2017
Feb. 28, 2018
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 1,728,000   1,460,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 628,547 627,127  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (329,000)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (32,000)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 58.01   $ 59.36
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 63.04 $ 58.38  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value 73.57    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 58.42    
Share-based Compensation Arrangement by Share-based Payment Award, Payments Upon Vesting $ 20.0 $ 25.9  
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options $ 5.6 $ 10.4