Other Postretirement Benefit Plans - Narrative (Details)	3 Months Ended		12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Actuarial gains (losses)	$ 1,300,000	$ (22,300,000)
Postretirement Plan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recognition of net actuarial gains (losses)			$ 500,000	$ 1,000,000.0	$ 13,100,000
Benefit obligation, discount rate (as a percent)	5.83%	5.55%	5.83%	5.55%	5.75%	2.99%
Actuarial gains (losses)			$ 500,000	$ 1,000,000.0
Benefit cost, discount rate (as a percent)			5.55%	5.75%	2.99%
Current liabilities	$ 3,600,000	$ 3,500,000	$ 3,600,000	$ 3,500,000
Weighted average annual rate of increase in per capita cost for medical benefits (as a percent)			7.00%
Weighted average annual rate of increase in per capita cost for medical benefits declining gradually (as a percent)			5.00%
Annual initial increase for prescription drug benefits and HMO benefits per year			$ 10
Weighted average annual rate of secondary increase for prescription drug benefits and HMO benefits (as a percent)			6.00%
Weighted average annual rate of increase in per capita for prescription drug benefits and HMO benefits declining (as a percent)			5.00%
Postretirement Plan | Lower Than Expected Benefit Payments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recognition of net actuarial gains (losses)			$ 2,000,000	1,400,000
Postretirement Plan | Impact of Experience Gains
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recognition of net actuarial gains (losses)			1,200,000
Postretirement Plan | Discount Rate in Dollars
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recognition of net actuarial gains (losses)			$ 600,000	$ 500,000	$ 8,400,000
Postretirement Plan | Discount Rate in Basis Points
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Increase (decrease) to discount rate (basis points)			0.0028	(0.0020)	0.0276
Postretirement Plan | Return on Plan Assets vs. Expectation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recognition of net actuarial gains (losses)					$ 1,900,000
Actuarial gains (losses)			$ (3,100,000)		3,000,000
Postretirement Plan | Other Valuation Assumptions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recognition of net actuarial gains (losses)			$ (200,000)	$ 100,000	$ 200,000