Long-term Debt (Tables)

9 Months Ended

Sep. 30, 2020

Debt Disclosure [Abstract]

Schedule of Long-term Debt

Long-term debt consists of the following (in millions):

	September 30, 2020		December 31, 2019
Amounts borrowed (Credit Facility)	$	363.0	$	324.8
Obligations under finance leases	81.7		57.3
Total long-term debt	$	444.7	$	382.1

Amounts related to the Credit Facility are as follows (in millions, except interest rate data):

	September 30, 2020		December 31, 2019
Amounts borrowed, net	$	363.0	$	324.8
Outstanding letters of credit	19.4		16.7
Amounts available to borrow(1)	352.1		341.7
Unamortized debt issuance costs	1.1		1.7

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(1)    Subject to borrowing base limitations, and excluding expansion feature of $200.0 million.

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2020			2019			2020			2019
Average borrowings	$	163.4		$	371.1		$	284.2		$	295.0
Range of borrowings	69.0 - 401.0			252.8 - 489.0			69.0 - 499.3			141.7 - 489.0
Unused Credit Facility and letter of credit participation fees(1)	0.4			0.3			1.0			0.9
Amortization of debt issuance costs(1)	0.2			0.2			0.6			0.6
Weighted-average interest rate(2)	1.4		%	3.5		%	1.9		%	3.6		%

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(1)    Included in interest expense, net.

(2)    Calculated based on the daily cost of borrowing, reflecting a blend of prime and LIBOR rates.