Pension and Postretirement Plans - Narratives (Details)		3 Months Ended	4 Months Ended	8 Months Ended	12 Months Ended
		Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 07, 2021 USD ($)	Dec. 31, 2023 USD ($) Plan	Dec. 31, 2022 USD ($)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Defined contribution plan, cost			$ 4,000,000.0	$ 9,700,000	$ 14,900,000	$ 13,900,000
Adjustments to goodwill						35,000,000
United States [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Allocation percentage in united states based investments					50.00%
Cincinnati Plans and Hawaii Nonunion Plan [Member] | Equity Securities [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Target allocation, plan assets percentage					40.00%
Cincinnati Plans and Hawaii Nonunion Plan [Member] | Fixed Income Securities [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Target allocation, plan assets percentage					60.00%
Cincinnati Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Number of noncontributory defined benefit pension plans | Plan					3
Hawaii Pension Plan for Union Employees [Member] | Equity Securities [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Target allocation, plan assets percentage					30.00%
Hawaii Pension Plan for Union Employees [Member] | Fixed Income Securities [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Target allocation, plan assets percentage					70.00%
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					$ 5,800,000	(5,100,000)
Settlements	[1]				0	7,500,000
Settlements	[1]				0	7,500,000
Actuarial gain	[2],[3]				(8,800,000)	146,300,000
Pension Plans, Defined Benefit [Member] | Qualified Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Contributions to pension plans			0	900,000	200,000	0
Expected future employer contributions, next fiscal year					1,000,000
Pension Plans, Defined Benefit [Member] | Nonqualified Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Contributions to pension plans			800,000	1,800,000	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			1,900,000	7,400,000		7,500,000
Settlements			$ 1,900,000	7,400,000		7,500,000
Pension settlement charges				$ 400,000
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					27,400,000	32,200,000
Settlements	[1]				0	0
Settlements	[1]				0	0
Actuarial gain	[2],[3]				(1,100,000)	$ 37,100,000
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		$ 4,700,000
Adjustments to postretirement and other benefits liability		45,900,000
Adjustments to goodwill		35,000,000
Adjustments to deferred income tax liabilities		$ 10,900,000

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

[2] The actuarial loss recorded for the year ended December 31, 2023 for the pension plans was primarily driven by a decrease in the discount rate. The actuarial (gain) recorded during the year ended December 31, 2022 for the pension plans was primarily driven by an increase in the discount rate.

[3] 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. The actuarial (gain) recorded for the year ended December 31, 2022 for the postretirement plans was primarily driven by an increase in the discount rate, updated census data and the result of actual versus expected benefit payments.