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Incentive Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 28, 2019
Mar. 31, 2019
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Threshold of Deductible Compensation for Executive Officers     $ 1.0
2012 Long-Term Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of shares available for issuance (in shares)     6,750,000
Annual rate for maximum number of shares available for issuance     1.00%
Performance-Based RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants in period (in shares)   957,600  
Performance-Based RSUs | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value per share at grant date (in USD per share)   $ 28.09  
Time-Based RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants in period (in shares)   327,900  
Fair value per share at grant date (in USD per share) $ 28.16    
Time-Based RSUs | Director | Non-Employee Director Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants in period (in shares) 78,716    
Fair value per share at grant date (in USD per share) $ 27.95    
Cash-Settled RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants in period (in shares) 1,025,900