Stock Based Compensation (Policies)

9 Months Ended

Sep. 30, 2013

Notes to Financial Statements [Abstract]

Stock Based Compensation

Roper records compensation expense for employee stock options based on the estimated fair value of the options on the date of grant using the Black-Scholes option-pricing model. Historical data, among other factors, is used to estimate the expected price volatility, the expected dividend yield, the expected option life and the expected forfeiture rate. The risk-free rate is based on the U.S. Treasury yield curve in effect at the time of grant for the estimated life of the option. The following weighted average assumptions were used to estimate the fair value of options granted during the current and prior year periods using the Black-Scholes option-pricing model: