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Share-Based Compensation
9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Share-Based Compensation Share-Based Compensation
During the nine months ended September 30, 2020, we granted 288,000 non-qualified employee stock options, 34,950 restricted stock units, 54,270 performance shares, and 20,361 phantom stock units. For the three months and nine months ended September 30, 2020, total share-based compensation expense was $3.9 million and $9.8 million and the related tax benefits were $1.0 million and $2.5 million. For the three months and nine months ended September 30, 2019, total share-based compensation expense was $4.1 million and $13.7 million the related tax benefits were $1.0 million and $3.4 million.

The estimated fair value of our 2020 non-qualified employee stock option awards and related underlying assumptions are shown in the table below.
2020
Weighted-average estimated fair value $22.50
Quarterly dividend rate $0.48
Expected term of stock options, in years4.2
Risk-free interest rate 1.3%
Dividend yield
2.5%
Expected stock price volatility
28.5%
Present value of dividends
$7.89