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Pension and Savings Plans (Tables) - Pension Plans, Defined Benefit [Member]

12 Months Ended

Dec. 31, 2017

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

Net periodic pension cost

Net periodic pension (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	$	1.6		$	0.6			$	2.5			$	2.7
Interest cost on projected benefit obligation	28.0			9.7				41.5				40.4
Expected return on plan assets	(33.5		)	(11.0		)		(45.3		)		(48.2		)
Amortization of prior service cost	—			0.1				0.3				1.0
Amortization of net actuarial losses	—			6.3				24.7				39.6
Settlement charge	2.1			—				—				—
Net actuarial gain	(23.5		)	—				—				—
Net periodic pension (benefit) cost	$	(25.3	)	$	5.7			$	23.7			$	35.5

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 arising during period	$	—			$	6.6			$	30.6
Amortization:
Net actuarial loss	(6.3		)		(24.7		)		(39.6		)
Prior service cost	(0.1		)		(0.3		)		(1.0		)
Total recorded in “Accumulated other comprehensive income (loss)”	$	(6.4	)		$	(18.4	)		$	(10.0	)

Summary of change in benefit obligation, change in plan assets and funded status

The following summarizes the change in benefit obligation, change in plan assets and funded status of the Pension Plans:

	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:
Projected benefit obligation at beginning of period	$	936.4		$	959.3			$	939.3
Service cost	1.6			0.6				2.5
Interest cost	28.0			9.7				41.5
Benefits paid	(45.3		)	(15.0		)		(61.1		)
Actuarial loss	25.3			—				37.1
Settlement	(71.4		)	—				—
Fresh start reporting adjustments	—			(18.2		)		—
Projected benefit obligation at end of period	874.6			936.4				959.3
Change in plan assets:
Fair value of plan assets at beginning of period	783.1			773.0				757.3
Actual return on plan assets	80.1			25.1				75.7
Employer contributions	30.1			—				1.1
Benefits paid	(45.3		)	(15.0		)		(61.1		)
Settlement	(71.4		)	—				—
Fair value of plan assets at end of period	776.6			783.1				773.0
Funded status at end of period	$	(98.0	)	$	(153.3	)		$	(186.3	)
Amounts recognized in the consolidated balance sheets:
Noncurrent obligation (included in “Other noncurrent liabilities”)	$	(98.0	)	$	(153.3	)		$	(163.5	)
Liabilities subject to compromise	—			—				(22.8		)
Net amount recognized	$	(98.0	)	$	(153.3	)		$	(186.3	)

Weighted-average assumptions used to determine 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

Weighted-average assumptions used to determine net periodic benefit cost

The weighted-average assumptions used to determine net periodic pension (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	%	4.55	%	4.15	%
Expected long-term return on plan assets	5.90	%			5.90	%	6.00	%	6.25	%
Measurement date	April 1, 2017				December 31, 2016		December 31, 2015		December 31, 2014

Fair value of assets in the Master Trust by category and by fair value valuation hierarchy

The following tables present the fair value of assets in the Master Trust by asset category and by fair value hierarchy:

	Successor
	December 31, 2017
	Level 1				Level 2				Level 3				Total
	(Dollars in millions)
Mutual funds	$	108.0			$	—			$	—			$	108.0
Corporate bonds	—				291.1				—				291.1
U.S. government securities	7.5				21.8				—				29.3
International government securities	—				17.7				—				17.7
Cash funds	30.8				—				—				30.8
Real estate investment trusts	—				—				11.8				11.8
Total assets at fair value	$	146.3			$	330.6			$	11.8			488.7
Assets measured at net asset value practical expedient (1)
Private mutual funds													180.4
Common collective trusts													107.5
													287.9
Total plan assets													$	776.6

	Predecessor
	December 31, 2016
	Level 1				Level 2				Level 3				Total
	(Dollars in millions)
Mutual funds	$	119.9			$	—			$	—			$	119.9
Corporate bonds	—				265.7				—				265.7
U.S. government securities	25.1				22.7				—				47.8
International government securities	—				12.6				—				12.6
Cash funds	17.8				—				—				17.8
Real estate investment trusts	—				—				14.1				14.1
Total assets at fair value	$	162.8			$	301.0			$	14.1			477.9
Assets measured at net asset value practical expedient (1)
Private mutual funds													186.1
Common collective trusts													109.0
													295.1
Total plan assets													$	773.0

⁽¹⁾ In accordance with Accounting Standards Update 2015-07, investments that are measured at fair value using the net asset value per share practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the total value of assets of the plans.

Summary of changes in the fair value of the Master Trust's Level 3 investments

The table below sets forth a summary of changes in the fair value of the Master Trust’s Level 3 investments:

	Successor			Predecessor
	April 2 through December 31, 2017			January 1 through April 1, 2017				Year Ended December 31, 2016
	(Dollars in millions)
Balance, beginning of period	$	13.8		$	14.1			$	23.0
Realized gains	—			0.6				1.8
Unrealized gains (losses) relating to investments still held at the reporting date	2.2			(0.6		)		0.2
Purchases, sales and settlements, net	(4.2		)	(0.3		)		(10.9		)
Balance, end of period	$	11.8		$	13.8			$	14.1

Summary of estimated future benefit payments

The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid in connection with the Company’s benefit obligation:

	Successor
	Pension Benefits
	(Dollars in millions)
2018	$	57.2
2019	57.2
2020	58.6
2021	59.5
2022	58.9
Years 2023-2027	280.1

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-Publisher FASB
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