Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation and Other Compensation Matters (Details 4)

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Share-Based Compensation and Other Compensation Matters (Details 4) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Performance-based PIUs      
Potential earned payout for defined levels of performance under awards      
Earned payout (as a percent of PSUs/ PIUs granted) on 75th or greater percentile rank 100.00%    
Earned payout (as a percent of PSUs/ PIUs granted) on 50th percentile rank (target) 50.00%    
Earned payout (as a percent of PSUs/ PIUs granted) on 25th percentile rank 25.00%    
Performance share units/ PB PIUs granted on percentile rank below 25th (as a percent) 0.00%    
Performance share units      
Potential earned payout for defined levels of performance under awards      
Earned payout (as a percent of PSUs/ PIUs granted) on 75th or greater percentile rank 200.00%    
Earned payout (as a percent of PSUs/ PIUs granted) on 50th percentile rank (target) 100.00%    
Earned payout (as a percent of PSUs/ PIUs granted) on 25th percentile rank 50.00%    
Performance share units/ PB PIUs granted on percentile rank below 25th (as a percent) 0.00%    
Performance share units | 2017 PSU Grants      
Assumptions used to value stock awards      
Grant date fair value (in dollars per share)     $ 38.43
Baseline Common Share Value (in dollars per share)     $ 31.22
Expected Volatility of Common Shares     19.00%
Risk-free Interest Rate     1.47%
Performance share units | 2018 PSU Grants      
Assumptions used to value stock awards      
Grant date fair value (in dollars per share)   $ 31.97  
Baseline Common Share Value (in dollars per share)   $ 29.20  
Expected Volatility of Common Shares   17.00%  
Risk-free Interest Rate   2.04%