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Incentive Plans (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 29, 2020
Mar. 31, 2020
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Threshold of executive compensation not eligible for U.S. income tax deduction     $ 1,000,000.0
2020 Long-Term Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of shares available for issuance (in shares)     5,000,000
Performance-Based RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants in period (in shares)     999,700
Fair value per share at grant date (in USD per share)     $ 21.51
Time-Based RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants in period (in shares) 106,248   340,600
Fair value per share at grant date (in USD per share) $ 22.59   $ 21.68
Cash Settled RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants in period (in shares) 1,152,500    
Fair value per share at grant date (in USD per share)   $ 21.68