Pension and Postretirement Plans - Narratives (Details)			4 Months Ended	8 Months Ended	12 Months Ended
		Sep. 07, 2021 USD ($)	Dec. 31, 2021 USD ($)	Sep. 07, 2021 USD ($)	Dec. 31, 2021 USD ($) Plan	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Defined contribution plan, cost			$ 4,000,000.0	$ 9,700,000		$ 13,100,000	$ 12,900,000
Actuarial gains (losses) and prior service costs (benefits) recorded in accumulated other comprehensive loss		$ 101,600,000		101,600,000
United States [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Allocation percentage in united states based investments					50.00%
Cincinnati Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Number of noncontributory defined benefit pension plans | Plan					3
Cincinnati Plans [Member] | Equity Securities [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Target allocation, plan assets percentage			40.00%		40.00%
Cincinnati Plans [Member] | Fixed Income Securities [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Target allocation, plan assets percentage			60.00%		60.00%
Hawaii Plans [Member] | Equity Securities [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Target allocation, plan assets percentage			30.00%		30.00%
Hawaii Plans [Member] | Fixed Income Securities [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Target allocation, plan assets percentage			70.00%		70.00%
Pension [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Decrease in benefit obligations		22,300,000
Postretirement [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Decrease in benefit obligations		$ 4,300,000
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			$ 2,000,000.0		$ 2,000,000.0	(136,200,000)
Settlements	[1]		1,900,000	7,400,000		21,100,000
Settlements	[1]		1,900,000	7,400,000		21,100,000
Pension settlement charges			0	0		3,800,000	0
Pension Plans, Defined Benefit [Member] | Qualified Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Contributions to pension plans			0	900,000		5,500,000	3,600,000
Pension Plans, Defined Benefit [Member] | Nonqualified Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Expected future employer contributions, next fiscal year			2,000,000		2,000,000
Pension Plans, Defined Benefit [Member] | Successor Period [Member] | Nonqualified Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Contributions to pension plans			800,000
Pension Plans, Defined Benefit [Member] | Predecessor Period [Member] | Nonqualified Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Contributions to pension plans				1,800,000		2,200,000	2,300,000
Pension Plans, Defined Benefit [Member] | Cincinnati Plans [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Settlements						6,000,000.0
Settlements						6,000,000.0
Pension settlement charges						2,300,000
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		15,100,000	1,000,000.0
Settlements			1,900,000	7,400,000		15,100,000	1,000,000.0
Pension settlement charges				400,000		1,500,000
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			600,000		600,000	(2,600,000)
Settlements	[1]		0	0		0
Settlements	[1]		0	0		0
Pension settlement charges			0	$ 0		$ 0	$ 0
Expected future employer contributions, next fiscal year			$ 7,000,000		$ 7,000,000

[1] The decrease in pension plan settlements in the Successor and Predecessor periods in 2021 compared to 2020 is due to participant elections in 2020 to take lump sum payments upon termination as result of the voluntary severance program offered to employees in both Cincinnati and Hawaii. The extent of the funding exceeded the settlement accounting threshold, and as such in all periods presented, these activities have been categorized as settlements.