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Stock-Based Compensation
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Share-based Payment Arrangement [Text Block] Stock-Based Compensation
The following table summarizes the Company's pre-tax compensation expense and related income tax benefit during the three and six months ended June 30, 2020 and 2019 related to the Company's performance units and restricted stock units.
Three Months Ended June 30,Six Months Ended June 30,
(In millions)2020201920202019
Performance units:  
Total shareholder return$2.0  $2.3  $3.7  $4.5  
Earnings per share0.1  0.4  0.3  0.9  
Total performance units2.1  2.7  4.0  5.4  
Restricted stock units0.2  0.2  0.3  0.5  
Total compensation expense$2.3  $2.9  $4.3  $5.9  
Income tax benefit$0.6  $0.7  $1.1  $1.5  
During the six months ended June 30, 2020, the Company purchased 255,000 shares of its common stock at an average cost of $38.04 per share on the open market, and 247,073 of these shares were used during the same period to satisfy payouts of earned performance units pursuant to the Company's Stock Incentive Plan. 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 six months ended June 30, 2020, there was an immaterial amount of shares of new common stock issued pursuant to the Company's Stock Incentive Plan to satisfy restricted stock grants.