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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Payment Arrangement, Cost by Plan [Table Text Block]
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