Defined Benefit and Postretirement Benefits (Expected Contributions to Pension and Postretirement Plans) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)
Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected contributions in 2023	$ 2.6
Amounts contributed during the nine months ended September 30, 2023	2.1
Postretirement
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected contributions in 2023	1.5
Amounts contributed during the nine months ended September 30, 2023	$ 1.4