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Pension and Postretirement Plans - Assumptions (Details)
4 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 07, 2021
Dec. 31, 2022
Dec. 31, 2020
Cincinnati Plans [Member]        
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]        
Healthcare cost trend 6.50% 6.50% 6.50%  
Rate to which the cost trend is assumed to decline (ultimate trend rate) 4.50% 4.50% 4.80%  
Year the rates reach the ultimate trend rate 2026 2025 2032  
Cincinnati Plans [Member] | Pension Plans, Defined Benefit [Member]        
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Discount rate 2.60% 2.40% 2.70% 3.10%
Expected long-term rate of return 6.00% 6.00% 5.80% 6.00%
Cash balance interest credit rate 4.00% 4.00% 4.00% 4.00%
Future compensation growth rate 0.00% 0.00% 0.00% 0.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]        
Discount rate 2.70% 2.60% 5.40%  
Cash balance interest credit rate 4.00% 4.00% 4.00%  
Future compensation growth rate 0.00% 0.00% 0.00%  
Cincinnati Plans [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Discount rate 2.60% 2.40% 2.80% 3.20%
Expected long-term rate of return 0.00% 0.00% 0.00% 0.00%
Cash balance interest credit rate 0.00% 0.00% 0.00% 0.00%
Future compensation growth rate 0.00% 0.00% 0.00% 0.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]        
Discount rate 2.80% 2.60% 5.40%  
Cash balance interest credit rate 0.00% 0.00% 0.00%  
Future compensation growth rate 0.00% 0.00% 0.00%  
Hawaii Plans [Member] | Pension Plans, Defined Benefit [Member]        
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Discount rate 2.50% 2.30% 3.90% 2.80%
Expected long-term rate of return 6.00% 6.00% 5.00% 6.00%
Cash balance interest credit rate 1.10% 1.20% 1.90% 2.00%
Future compensation growth rate 0.00% 0.00% 0.00% 0.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]        
Discount rate 2.70% 2.50% 5.40%  
Cash balance interest credit rate 1.30% 1.10% 5.10%  
Future compensation growth rate 0.00% 0.00% 0.00%  
Hawaii Plans [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Discount rate 2.80% 2.60% 3.70% 3.30%
Expected long-term rate of return 0.00% 0.00% 0.00% 0.00%
Cash balance interest credit rate 0.00% 0.00% 0.00% 0.00%
Future compensation growth rate 0.00% 0.00% 0.00% 0.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]        
Discount rate 2.90% 2.80% 5.50%  
Cash balance interest credit rate 0.00% 0.00% 0.00%  
Future compensation growth rate 0.00% 0.00% 0.00%