Leases (Tables)

9 Months Ended

Sep. 30, 2019

The components of lease expense during the three and nine months ended September 30, 2019 were as follows:



	Three Months Ended September 30, 2019			Nine Months Ended September 30, 2019
	(Dollars in millions)
Operating lease cost:
Operating lease cost	$	9.9		$	33.9
Short-term lease cost	15.8			34.7
Variable lease cost	2.0			16.6
Sublease income	(1.0		)	(1.9		)
Total operating lease cost	$	26.7		$	83.3

Finance lease cost:
Amortization of right-of-use assets	$	3.4		$	12.0
Interest on lease liabilities	0.3			1.2
Total finance lease cost	$	3.7		$	13.2

Supplemental balance sheet information related to leases at September 30, 2019 was as follows:



	September 30, 2019
	(Dollars in millions)
Operating leases:
Operating lease right-of-use assets	$	85.6

Accounts payable and accrued expenses	$	27.6
Operating lease liabilities, less current portion	55.1
Total operating lease liabilities	$	82.7

Finance leases:
Property, plant, equipment and mine development	$	95.4
Accumulated depreciation	(49.3		)
Property, plant, equipment and mine development, net	$	46.1

Current portion of long-term debt	$	19.4
Long-term debt, less current portion	0.2
Total finance lease liabilities	$	19.6

Weighted average remaining lease term (years)
Operating leases	4.0
Finance leases	0.6

Weighted average discount rate
Operating leases	7.3		%
Finance leases	5.9		%

Supplemental cash flow information related to leases during the three and nine months ended September 30, 2019 was as follows:



	Three Months Ended September 30, 2019		Nine Months Ended September 30, 2019
	(Dollars in millions)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	8.4	$	41.8
Operating cash flows for finance leases	0.3		1.2
Financing cash flows for finance leases	5.6		24.0

Right-of-use assets obtained in exchange for lease obligations:
Operating leases	3.4		9.7
Finance leases	0.3		0.4

Maturities of lease liabilities were as follows: