Pension and Other Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Pension
Pension and Other Postretirement Benefit Plans [Line Items]
Employer contributions	$ 17.3	$ 0.0
Expected future employer contributions	0.0
Other Postretirement
Pension and Other Postretirement Benefit Plans [Line Items]
Employer contributions	0.0	$ 0.0
Expected future employer contributions	$ 0.0