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Share-Based Compensation and Pensions - Performance Share Units (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended 36 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2019
Performance share units, FDBVPS          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
PSU's Granted at Target (shares)       186,186  
Forfeited (shares)       (24,388)  
Estimated Change in Multiplier (shares)       27,641  
Nonvested Units (shares) 189,439     189,439 189,439
Number of Shares          
Granted (shares)       186,186  
Increase for above target vest (shares)       27,641  
Forfeited (shares)       (24,388)  
Nonvested — December 31 (shares) 189,439     189,439  
Performance share units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period 3 years        
PSU's Granted at Target (shares) 36,616        
Forfeited (shares) (13,845)        
Estimated Change in Multiplier (shares) 27,641        
Nonvested Units (shares) 206,949 159,168   206,949 206,949
Number of Shares          
Nonvested — January 1 (shares) 159,168        
Granted (shares) 36,616        
Increase for above target vest (shares) 27,641        
Vested (shares) (2,631)        
Forfeited (shares) (13,845)        
Nonvested — December 31 (shares) 206,949 159,168   206,949  
Weighted-Average Share Price of Award          
Nonvested - January 1 (dollars per share) $ 190.77        
Granted (dollars per share) 166.42        
Increase for above target vest (dollars per share) 188.62        
Vested (dollars per share) 195.60        
Forfeited (dollars per share) 198.37        
Nonvested - December 31 (dollars per share) $ 185.61 $ 190.77   $ 185.61  
Unrecognized compensation cost         $ 7.9
Unrecognized compensation cost, period of recognition 1 year 6 months 3 days        
Performance Target One | Performance share units | Minimum          
Performance Multiplier Levels Per Award Agreements          
Share settlement percentage 100.00%        
Performance Target One | Performance share units | Maximum          
Performance Multiplier Levels Per Award Agreements          
Share settlement percentage 150.00%        
2017 Awards | Performance share units, FDBVPS | Tranche One          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
PSU's Granted at Target (shares)     36,321    
Forfeited (shares)     (12,176)    
Estimated Change in Multiplier (shares)     9,560    
Nonvested Units (shares) 33,705     33,705 33,705
Change in FDBVPS (3 - year)          
Threshold 20.00%        
Target 30.00%        
Maximum 40.00%        
Performance Multiplier Levels Per Award Agreements          
Threshold 50.00%        
Target 100.00%        
Maximum 150.00%        
Performance Criteria: Average Annual Operating ROE          
Performance multiplier 139.00% 50.00% 100.00%    
Number of Shares          
Granted (shares)     36,321    
Increase for above target vest (shares)     9,560    
Forfeited (shares)     (12,176)    
Nonvested — December 31 (shares) 33,705     33,705  
2017 Awards | Performance share units, FDBVPS | Tranche Two          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
PSU's Granted at Target (shares)     91,875    
Forfeited (shares)     0    
Estimated Change in Multiplier (shares)     18,081    
Nonvested Units (shares) 109,956     109,956 109,956
Change in FDBVPS (3 - year)          
Threshold 30.30%        
Target 35.65%        
Maximum 41.00%        
Performance Multiplier Levels Per Award Agreements          
Threshold 50.00%        
Target 100.00%        
Maximum 150.00%        
Performance Criteria: Average Annual Operating ROE          
Performance multiplier 120.00% 50.00% 100.00%    
Number of Shares          
Granted (shares)     91,875    
Increase for above target vest (shares)     18,081    
Forfeited (shares)     0    
Nonvested — December 31 (shares) 109,956     109,956  
2017 Awards | Performance Target Two | Performance share units, FDBVPS | Minimum          
Performance Multiplier Levels Per Award Agreements          
Share settlement percentage 50.00%        
2017 Awards | Performance Target Two | Performance share units, FDBVPS | Maximum          
Performance Multiplier Levels Per Award Agreements          
Share settlement percentage 100.00%        
2018 Awards | Performance share units, FDBVPS          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
PSU's Granted at Target (shares)   39,682      
Forfeited (shares)   (11,414)      
Estimated Change in Multiplier (shares)   0      
Nonvested Units (shares) 28,268     28,268 28,268
Change in FDBVPS (3 - year)          
Threshold 25.00%        
Target 32.50%        
Maximum 40.00%        
Performance Multiplier Levels Per Award Agreements          
Threshold 50.00%        
Target 100.00%        
Maximum 150.00%        
Performance Criteria: Average Annual Operating ROE          
Performance multiplier 100.00% 50.00%      
Number of Shares          
Granted (shares)   39,682      
Increase for above target vest (shares)   0      
Forfeited (shares)   (11,414)      
Nonvested — December 31 (shares) 28,268     28,268  
2018 Awards | Performance Target Two | Performance share units | Minimum          
Performance Multiplier Levels Per Award Agreements          
Share settlement percentage 50.00%        
2018 Awards | Performance Target Two | Performance share units | Maximum          
Performance Multiplier Levels Per Award Agreements          
Share settlement percentage 100.00%        
2019 Awards | Performance share units, FDBVPS          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
PSU's Granted at Target (shares) 18,308        
Forfeited (shares) (798)        
Estimated Change in Multiplier (shares) 0        
Nonvested Units (shares) 17,510     17,510 17,510
Change in FDBVPS (3 - year)          
Threshold 20.00%        
Target 30.00%        
Maximum 40.00%        
Performance Multiplier Levels Per Award Agreements          
Threshold 60.00%        
Target 100.00%        
Maximum 150.00%        
Number of Shares          
Granted (shares) 18,308        
Increase for above target vest (shares) 0        
Forfeited (shares) (798)        
Nonvested — December 31 (shares) 17,510     17,510  
2019 Awards | Performance share units, FDBVPS | Tranche One          
Performance Criteria: Average Annual Operating ROE          
Performance multiplier 100.00%        
2019 Awards | Performance share units, Average Operating ROE          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
PSU's Granted at Target (shares) 18,308        
Forfeited (shares) (798)        
Estimated Change in Multiplier (shares) 0        
Nonvested Units (shares) 17,510     17,510 17,510
Performance Multiplier Levels Per Award Agreements          
Threshold 60.00%        
Target 100.00%        
Maximum 150.00%        
Performance Criteria: Average Annual Operating ROE          
Threshold 9.60%        
Target 12.00%        
Maximum 14.40%        
Number of Shares          
Granted (shares) 18,308        
Increase for above target vest (shares) 0        
Forfeited (shares) (798)        
Nonvested — December 31 (shares) 17,510     17,510  
2019 Awards | Performance share units, Average Operating ROE | Tranche Two          
Performance Criteria: Average Annual Operating ROE          
Performance multiplier 100.00%        
2019 Awards | Performance Target Two | Performance share units | Minimum          
Performance Multiplier Levels Per Award Agreements          
Share settlement percentage 60.00%        
2019 Awards | Performance Target Two | Performance share units | Maximum          
Performance Multiplier Levels Per Award Agreements          
Share settlement percentage 100.00%