Pension and Postretirement Benefit Plans (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)
Pension benefits
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 26.7
Estimated minimum contributions for current fiscal year	34.6
Postretirement Health Coverage
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	1.2
Estimated minimum contributions for current fiscal year	$ 1.7