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STOCK-BASED COMPENSATION (Tables)
3 Months Ended
Mar. 31, 2014
Stock-Based Compensation Cost and Associated Tax Benefit
 Three Months Ended
 March 31,
 2014 2013
Stock-based compensation cost$ 20.3 $ 17.2
Tax benefit$ 6.3 $ 6.2
Weighted Average Assumptions used in Determining Fair Value for Options Granted
Expected dividend yield 1.41%
Expected stock volatility 41%
Risk-free interest rate 2.30%
Expected holding period7.2 years
Grant date fair value$ 31.49
Stock Option Exercises and Restricted Stock Vesting
  Three months ended
  March 31,
Exercise of stock options: 2014 2013
Proceeds from stock option exercises $ 56.1 $ 31.4
Aggregate intrinsic value $ 42.9 $ 21.8
Tax benefit realized upon exercise $ 16.1 $ 7.7
Number of shares exercised   1.2   1.0
       
  Three months ended
  March 31,
Vesting of restricted stock: 2014 2013
Fair value of shares vested $ 91.4 $ 53.8
Tax benefit realized upon vesting $ 31.8 $ 19.1
Number of shares vested   1.2   1.1
       
  Three months ended
  March 31,
Delivery of performance-based restricted stock: 2014 2013
Fair value of shares delivered $ 38.0 $ 25.5
Tax benefit realized upon delivery $ 14.8 $ 9.7
Number of shares delivered   0.5   0.5