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Pension Benefits - Schedule of Plan Assets Allocations (Details) - Pension Benefits
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation Range 100.00%    
Plan Assets Percentage 100.00% 100.00% 100.00%
Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan Assets Percentage 51.00% 51.00% 58.00%
Equity Securities | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation Range 45.00%    
Equity Securities | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation Range 55.00%    
Debt Securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan Assets Percentage 38.00% 39.00% 33.00%
Debt Securities | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation Range 33.00%    
Debt Securities | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation Range 43.00%    
Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Plan Assets Percentage 11.00% 10.00% 9.00%
Real Estate | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation Range 10.00%    
Real Estate | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation Range 14.00%