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Pension and Postretirement Benefit Plans (Narrative) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2024
USD ($)
Pension benefits  
Defined Benefit Plan Disclosure [Line Items]  
Employer contributions $ 18.4
Estimated contributions for current fiscal year 25.9
Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Employer contributions 0.8
Estimated contributions for current fiscal year $ 1.7