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Derivatives and Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2020

Fair Value Disclosures [Abstract]

Fair Value, by Balance Sheet Grouping [Table Text Block]

The fair value of derivatives reflected in the accompanying condensed consolidated balance sheets are set forth in the table below.

			June 30, 2020																		December 31, 2019
			Asset Derivative						Liability Derivative						Asset Derivative						Liability Derivative
			(Dollars in millions)
Foreign currency option contracts			$	3.6					$	—					$	1.1					$	—
Coal contracts related to forecasted sales			23.8						—						20.1						(0.1)
Coal trading contracts			67.3						(62.0)						81.1						(74.2)
Total derivatives			94.7						(62.0)						102.3						(74.3)
Effect of counterparty netting			(62.0)						62.0						(74.3)						74.3
Variation margin (held) posted			(23.8)						—						(22.1)						—
Net derivatives and margin as classified in the balance sheets			$	8.9					$	—					$	5.9					$	—

Derivative Instruments, Gain (Loss) [Table Text Block]

The tables below show the amounts of pre-tax gains and losses related to the Company’s derivatives.

			Three Months Ended June 30, 2020
			Total gain (loss) recognized in income						(Loss) gain realized in income on derivatives						Unrealized gain (loss) recognized in income on derivatives
Financial Instrument
			(Dollars in millions)
Foreign currency option contracts			$	2.2					$	(0.6)					$	2.8
Coal contracts related to forecasted sales			12.6						5.7						6.9
Coal trading contracts			(0.1)						(1.9)						1.8
Total			$	14.7					$	3.2					$	11.5
			Three Months Ended June 30, 2019
			Total (loss) gain recognized in income						(Loss) gain realized in income on derivatives						Unrealized (loss) gain recognized in income on derivatives
Financial Instrument
			(Dollars in millions)
Foreign currency option contracts			$	(1.4)					$	(1.1)					$	(0.3)
Coal contracts related to forecasted sales			42.5						20.1						22.4
Coal trading contracts			(0.3)						(6.0)						5.7
Total			$	40.8					$	13.0					$	27.8

			Six Months Ended June 30, 2020
			Total gain (loss) recognized in income						(Loss) gain realized in income on derivatives						Unrealized gain (loss) recognized in income on derivatives
Financial Instrument
			(Dollars in millions)
Foreign currency option contracts			$	1.3					$	(1.6)					$	2.9
Coal contracts related to forecasted sales			4.1						(0.6)						4.7
Coal trading contracts			(0.3)						2.2						(2.5)
Total			$	5.1					$	—					$	5.1
			Six Months Ended June 30, 2019
			Total (loss) gain recognized in income						(Loss) gain realized in income on derivatives						Unrealized (loss) gain recognized in income on derivatives
Financial Instrument
			(Dollars in millions)
Foreign currency option contracts			$	(2.5)					$	(2.4)					$	(0.1)
Coal contracts related to forecasted sales			93.2						31.0						62.2
Coal trading contracts			(1.3)						(10.8)						9.5
Total			$	89.4					$	17.8					$	71.6

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The following tables set forth the hierarchy of the Company’s net financial asset positions for which fair value is measured on a recurring basis:

			June 30, 2020
			Level 1						Level 2						Level 3						Total
			(Dollars in millions)
Foreign currency option contracts			$	—					$	3.6					$	—					$	3.6
Coal contracts related to forecasted sales			—						26.5						—						26.5
Coal trading contracts			—						(21.2)						—						(21.2)
Equity securities			—						—						4.0						4.0
Total net financial assets			$	—					$	8.9					$	4.0					$	12.9
			December 31, 2019
			Level 1						Level 2						Level 3						Total
			(Dollars in millions)
Foreign currency option contracts			$	—					$	1.1					$	—					$	1.1
Coal contracts related to forecasted sales			—						21.2						—						21.2
Coal trading contracts			—						(16.4)						—						(16.4)
Equity securities			—						—						4.0						4.0
Total net financial assets			$	—					$	5.9					$	4.0					$	9.9

Carrying Amounts And Estimated Fair Values Of Companys Debt [Table Text Block]

The fair value of debt, shown below, is principally based on reported market values and estimates based on interest rates, maturities, credit risk, underlying collateral, and completed market transactions, which have been limited in recent history.

			June 30, 2020									December 31, 2019
			(Dollars in millions)
Total debt at par value			$	1,657.9					$	1,367.2
Less: Unamortized debt issuance costs and original issue discount			(50.0)						(56.4)
Net carrying amount			$	1,607.9					$	1,310.8
Estimated fair value			$	1,007.2					$	1,271.1

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Carrying amounts and estimated fair values of the Company's debt.

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Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.

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Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments.

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Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
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