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Pension and Postretirement Benefit Plans (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($)
Amortization of prior service cost
Defined Benefit Plan Disclosure [Line Items]
Revision of prior service cost estimate	$ 24.4
Pension benefits
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	26.3
Estimated minimum contributions	34.2
Postretirement Health Coverage
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	1.2
Estimated minimum contributions	$ 1.5

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