Leases (Tables)

3 Months Ended

Mar. 31, 2019

The components of lease expense during the three months ended March 31, 2019 were as follows:



	Three Months Ended March 31, 2019
	(Dollars in millions)
Operating lease cost:
Operating lease cost	$	15.5
Short-term lease cost	8.3
Variable lease cost	6.0
Sublease income	(1.4		)
Total operating lease cost	$	28.4

Finance lease cost:
Amortization of right-of-use assets	$	4.1
Interest on lease liabilities	0.5
Total finance lease cost	$	4.6

Supplemental balance sheet information related to leases at March 31, 2019 was as follows:



	March 31, 2019
	(Dollars in millions)
Operating leases:
Operating lease right-of-use assets	$	97.0

Accounts payable and accrued expenses	$	30.7
Operating lease liabilities, less current portion	58.2
Total operating lease liabilities	$	88.9

Finance leases:
Property, plant, equipment and mine development	$	97.8
Accumulated depreciation	(33.4		)
Property, plant, equipment and mine development, net	$	64.4

Current portion of long-term debt	$	30.8
Long-term debt, less current portion	1.9
Total finance lease liabilities	$	32.7

Weighted average remaining lease term
Operating leases	4.2 years
Finance leases	5.4 years

Weighted average discount rate
Operating leases	7.4		%
Finance leases	7.6		%

Supplemental cash flow information related to leases during the three months ended March 31, 2019 was as follows:



	Three Months Ended March 31, 2019
	(Dollars in millions)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	24.1
Operating cash flows for finance leases	0.7
Financing cash flows for finance leases	7.3

Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$	0.5
Finance leases	—

Maturities of lease liabilities were as follows: