Long-term Debt (Tables)

6 Months Ended

Jun. 30, 2021

Debt Disclosure [Abstract]

Schedule of Long-term Debt

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

	June 30, 2021		December 31, 2020
Amounts borrowed (Credit Facility)	$	332.0	$	258.0
Obligations under finance leases	99.8		86.5
Total long-term debt	$	431.8	$	344.5

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

	June 30, 2021		December 31, 2020
Amounts borrowed, net	$	332.0	$	258.0
Outstanding letters of credit	43.8		19.5
Amounts available to borrow(1)	347.3		402.4
Unamortized debt issuance costs	3.3		0.9

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

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2021			2020			2021			2020
Average borrowings	$	221.2		$	354.3		$	211.9		$	345.3
Range of borrowings	126.0 - 378.0			225.0 - 451.0			126.0 - 378.0			151.5 - 499.3
Unused Credit Facility and letter of credit participation fees(1)	0.4			0.3			0.8			0.6
Amortization of debt issuance costs(1)	0.2			0.2			0.5			0.4
Weighted-average interest rate(2)	1.4		%	1.4		%	1.4		%	2.1		%

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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.