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Leases (Tables)

12 Months Ended

Dec. 31, 2018

Leases [Abstract]

Leases And Royalty Future Minimum Payments [Table Text Block]

Future minimum lease and royalty payments as of December 31, 2018 are as follows:

		Capital Leases				Operating Leases				Coal Lease and Royalty Obligations
Year Ending December 31,
		(Dollars in millions)
2019		$	28.2			$	47.6			$	5.4
2020		8.0				27.6				5.5
2021		0.4				15.9				5.6
2022		0.4				11.8				5.4
2023		0.5				12.1				5.5
2024 and thereafter		8.8				12.1				36.2
Total minimum lease payments		46.3				$	127.1			$	63.6
Less interest		6.3
Present value of minimum capital lease payments		$	40.0

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