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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2020

Share-based Payment Arrangement [Abstract]

Grant Date Fair Value for Awards of Performance Units Inputs

The Monte Carlo simulation valuation methodology applied the following key inputs:

						2020						2019
Valuation date price based on March 26, 2020 and March 8, 2019 closing stock prices of Quanta common stock						$31.49						$35.19
Expected volatility						34		%				25		%
Risk-free interest rate						0.35		%				2.43		%
Term in years						2.76						2.81

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Schedule Of Share Based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions [Table Text Block]

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