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Stock Based Compensation (Policies)

9 Months Ended

Sep. 30, 2012

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 current and prior year periods using the Black-Scholes option-pricing model:

	Nine months ended September 30,
	2012		2011
Fair value per share ($)	30.19		24.45
Risk-free interest rate (%)	0.77		1.91
Expected option life (years)	5.24		5.34
Expected volatility (%)	36.51		35.26
Expected dividend yield (%)	0.58		0.60

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- Definition

This element describes an entity's accounting policy for stock option and stock incentive plans. This disclosure may include (1) the types of stock option or incentive plans sponsored by the entity (2) the groups that participate in (or are covered by) each plan (3) significant plan provisions and (4) how stock compensation is measured, and the methodologies and significant assumptions used to determine that measurement.

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