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Long-Term Incentive Compensation Plans:Cash Plan (Details) - Other employees [Member] - Long-Term Incentive Compensation Plans
$ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
tranch
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Stock-Based Compensation [Abstract]      
Performance cash awards that could be awarded, as a percentage of target amount, minimum 0.00%    
Performance cash awards that could be awarded, as a percentage of target amount, maximum 200.00%    
Number of equal tranches for annual vesting (in tranches) | tranch 3    
Long-Term Incentive Cash Plan Expense | $ $ 5.9 $ 5.3 $ 3.9
Performance Cash Awards Target Percentage Earned   200.00% 200.00%