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Stock Incentive Plans - Fair Value Assumptions (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based awards earned 258,919    
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average fair value per share of grants (in dollars per share) $ 29.67 $ 23.66 $ 38.37
Performance shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average fair value per share of grants (in dollars per share) 29.90 $ 23.78  
2010 LTIP | RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average fair value per share of grants (in dollars per share) $ 0.01    
Number of shares awarded (in shares) 223,308    
2010 LTIP | Performance shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average fair value per share of grants (in dollars per share) $ 0.01    
Number of shares awarded (in shares) 144,352 193,006  
Share-based awards earned   141,406