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Stock-Based Compensation
 9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Shareholders' Equity and Share-based Payments Stock-Based Compensation
The following table summarizes the Company's pre-tax compensation expense and related income tax benefit during the three and nine months ended September 30, 2020 and 2019 related to the Company's performance units and restricted stock units.
Three Months Ended September 30,Nine Months Ended September 30,
(In millions)2020201920202019
Performance units:  
Total shareholder return$1.9 $2.3 $5.6 $6.8 
Earnings per share0.2 2.3 0.5 3.2 
Total performance units2.1 4.6 6.1 10.0 
Restricted stock units0.3 0.3 0.6 0.8 
Total compensation expense$2.4 $4.9 $6.7 $10.8 
Income tax benefit$0.6 $1.3 $1.7 $2.8 

During the three and nine months ended September 30, 2020, the Company purchased 150,000 and 405,000 shares of its common stock, respectively. During March 2020 and August 2020, 247,073 and an immaterial number of these shares, respectively, were used to satisfy payouts of earned performance units and restricted stock unit grants pursuant to the Company's Stock Incentive Plan. The Company intends to use the remaining shares to satisfy payouts of earned performance units and restricted stock unit grants pursuant to its Stock Incentive Plan. The shares were purchased at an average cost of $38.04 and $33.14 per share on the open market during March 2020 and August 2020, respectively. The Company records treasury stock purchases at cost. Treasury stock is presented as a reduction of stockholders' equity in the Company's 2020 Condensed Consolidated Balance Sheet.
During the nine months ended September 30, 2020, there was an immaterial number of shares of new common stock issued pursuant to the Company's Stock Incentive Plan to satisfy restricted stock unit grants.