Pension and Postretirement Plans - Narratives (Details)		3 Months Ended	12 Months Ended
		Sep. 30, 2022 USD ($)	Dec. 31, 2024 USD ($) Plan	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Defined contribution plan, cost			$ 8,300,000	$ 8,000,000	$ 7,600,000
United States [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Allocation percentage in united states based investments			50.00%
CBMPP Assets [Member] | Equity Securities [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Target allocation, plan assets percentage			20.00%
CBMPP Assets [Member] | Fixed Income Securities [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Target allocation, plan assets percentage			80.00%
CBPP Assets [Member] | Equity Securities [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Target allocation, plan assets percentage			30.00%
CBPP Assets [Member] | Fixed Income Securities [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Target allocation, plan assets percentage			70.00%
Hawaii Union Pension Plans [Member] | Equity Securities [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Target allocation, plan assets percentage			10.00%
Hawaii Union Pension Plans [Member] | Fixed Income Securities [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Target allocation, plan assets percentage			90.00%
Cincinnati Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Number of noncontributory defined benefit pension plans | Plan			3
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Actuarial gains (losses) and prior service costs (benefits) recorded in accumulated other comprehensive loss			$ 6,300,000	5,800,000
Settlements	[1]		112,900,000	0
Settlements	[1]		112,900,000	0
Actuarial (gain) loss	[2],[3]		13,000,000	(8,800,000)
Pension settlement charges			3,500,000	0	0
Pension Plans, Defined Benefit [Member] | Qualified Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Contributions to pension plans			800,000	200,000	0
Expected future employer contributions, next fiscal year			2,000,000
Pension Plans, Defined Benefit [Member] | Nonqualified Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Contributions to pension plans			1,900,000	2,000,000	2,200,000
Expected future employer contributions, next fiscal year			2,000,000
Pension Plans, Defined Benefit [Member] | Hawaii Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Decrease in benefit obligations					7,500,000
Settlements					7,500,000
Pension Plans, Defined Benefit [Member] | Group Annuity Contract [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Decrease in benefit obligations			16,400,000
Settlements			16,400,000
Pension settlement charges			3,500,000
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Actuarial gains (losses) and prior service costs (benefits) recorded in accumulated other comprehensive loss			28,700,000	27,400,000
Settlements	[1]		0	0
Settlements	[1]		0	0
Actuarial (gain) loss	[2],[3]		6,200,000	(1,100,000)
Pension settlement charges			0	$ 0	$ 0
Expected future employer contributions, next fiscal year			$ 7,000,000
Other Postretirement Benefit Plans, Defined Benefit [Member] | Hawaii Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Actuarial (gain) loss		$ 4,700,000

[1] Group annuity contracts and participant elections to take lump sum payments that exceeded the settlement accounting threshold and have been categorized as settlements.

[2] The actuarial (gain) recorded for the year ended December 31, 2024 for the pension plans was primarily driven by an increase in the discount rate. The actuarial loss recorded during the year ended December 31, 2023 for the pension plans was primarily driven by a decrease in the discount rate.

[3] The actuarial (gain) recorded for the year ended December 31, 2024 for the postretirement plans was primarily driven by an increase in the discount rate. The actuarial loss recorded for the year ended December 31, 2023 for the postretirement plans was primarily driven by a decrease in the discount rate.