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Postretirement Health Care and Life Insurance Benefits (Tables) - Postretirement Health Care and Life Insurance Benefits [Member]

12 Months Ended

Dec. 31, 2017

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Components of net periodic postretirement benefit cost

Net periodic postretirement benefit cost included the following components:

	Successor			Predecessor
	April 2 through December 31, 2017			January 1 through April 1, 2017				Year Ended December 31, 2016				Year Ended December 31, 2015
	(Dollars in millions)
Service cost for benefits earned	$	6.9		$	2.3			$	10.4			$	11.2
Interest cost on accumulated postretirement benefit obligation	24.2			8.4				34.5				33.8
Amortization of prior service credit	—			(2.3		)		(9.2		)		(6.8		)
Amortization of actuarial loss	—			5.5				20.4				24.9
Net actuarial gain	(22.0		)	—				—				—
Net periodic postretirement benefit cost	$	9.1		$	13.9			$	56.1			$	63.1

Amounts recognized in accumulated other comprehensive loss

The following includes pre-tax amounts recorded in “Accumulated other comprehensive income (loss)”:

	Predecessor
	January 1 through April 1, 2017				Year Ended December 31, 2016				Year Ended December 31, 2015
	(Dollars in millions)
Net actuarial loss (gain) arising during year	$	—			$	32.3			$	(35.1	)
Amortization:
Actuarial loss	(5.5		)		(20.4		)		(24.9		)
Prior service credit	2.3				9.2				6.8
Settlement related to the Patriot bankruptcy:
Prior service credit (cost)	—				7.2				(16.6		)
Total recorded in “Accumulated other comprehensive income (loss)”	$	(3.2	)		$	28.3			$	(69.8	)

Reconciled amount of plan's funded status

The following table sets forth the plans’ funded status reconciled with the amounts shown in the consolidated balance sheets:

	Successor			Predecessor
	April 2 through December 31, 2017			January 1 through April 1, 2017				Year Ended December 31, 2016
	(Dollars in millions)
Change in benefit obligation:
Accumulated postretirement benefit obligation at beginning of period	$	803.1		$	812.1			$	776.1
Service cost	6.9			2.3				10.4
Interest cost	24.2			8.4				34.5
Participant contributions	0.4			0.2				0.6
Plan changes	—			—				7.2
Benefits paid	(29.3		)	(12.8		)		(49.0		)
Actuarial (gain) loss	(22.0		)	—				32.3
Fresh start reporting adjustments	—			(7.1		)		—
Accumulated postretirement benefit obligation at end of period	783.3			803.1				812.1
Change in plan assets:
Fair value of plan assets at beginning of period	—			—				—
Employer contributions	28.9			12.6				48.4
Participant contributions	0.4			0.2				0.6
Benefits paid and administrative fees (net of Medicare Part D reimbursements)	(29.3		)	(12.8		)		(49.0		)
Fair value of plan assets at end of period	—			—				—
Funded status at end of period	(783.3		)	(803.1		)		(812.1		)
Less: Current portion (included in “Accounts payable and accrued expenses”)	53.3			56.1				55.8
Noncurrent obligation (included in “Accrued postretirement benefit costs”)	$	(730.0	)	$	(747.0	)		$	(756.3	)

Weighted-average assumptions used to determine the benefit obligations

The weighted-average assumptions used to determine the benefit obligations as of the end of each year were as follows:

	Successor		Predecessor
	December 31,
	2017		2016
Discount rate	3.70	%	4.15	%
Measurement date	December 31, 2017		December 31, 2016

The weighted-average assumptions used to determine net periodic benefit cost during each period were as follows:

	Successor		Predecessor
	April 2 through December 31, 2017		January 1 through April 1, 2017			Year Ended December 31, 2016			Year Ended December 31, 2015
Discount rate											4.10	%	4.15	%		4.50	%		4.10	%
Measurement date	April 1, 2017		December 31, 2016			December 31, 2015			December 31, 2014

Assumed health care cost trend rate

The following presents information about the assumed health care cost trend rate:

	Successor		Predecessor
	Year Ended December 31, 2017		Year Ended December 31, 2016
Pre-Medicare:
Health care cost trend rate assumed for next year	7.00	%	6.20	%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)	4.75	%	4.75	%
Year that the rate reaches the ultimate trend rate	2023		2021
Post-Medicare:
Health care cost trend rate assumed for next year	6.50	%	5.60	%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)	4.75	%	4.75	%
Year that the rate reaches the ultimate trend rate	2023		2021

Assumed health care cost trend rates, one percentage point increase

A one-percentage-point change in the assumed health care cost trend would have the following effects for the year ended December 31, 2017:

	One Percentage- Point Increase				One Percentage- Point Decrease
	(Dollars in millions)
Effect on total service and interest cost components	$	3.2			$	(2.9	)
Effect on total postretirement benefit obligation	$	69.1			$	(60.7	)

Summary of estimated future benefit payments

The following benefit payments (net of retiree contributions), which reflect expected future service, as appropriate, are expected to be paid by the Company:

	Postretirement
	Benefits
	(Dollars in millions)
2018	$	52.2
2019	53.5
2020	55.9
2021	57.6
2022	56.9
Years 2023-2027	266.4

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- Definition

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-Publisher FASB
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Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter.

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