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Pension and Postretirement Benefit Plans (Narrative) (Details)
$ in Millions
9 Months Ended
Sep. 30, 2024
USD ($)
Pension benefits  
Defined Benefit Plan Disclosure [Line Items]  
Employer contributions $ 22.0
Estimated contributions for current fiscal year 25.4
Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Employer contributions 1.2
Estimated contributions for current fiscal year $ 1.7