Long-term Debt (Tables)

12 Months Ended

Dec. 31, 2020

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

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

	December 31,
	2020		2019
Amounts borrowed (Credit Facility)	$	258.0	$	324.8
Obligations under finance leases	86.5		57.3
Total long-term debt	$	344.5	$	382.1

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

	December 31,
	2020			2019
Amounts borrowed, net	$	258.0		$	324.8
Outstanding letters of credit	19.5			16.7
Amounts available to borrow(1)	402.4			341.7
Average borrowings	259.5			303.2
Range of borrowings	69.0 - 499.3			141.7 - 508.0
Unamortized debt issuance costs	0.9			1.7
Weighted-average interest rate(2)	1.8		%	3.4		%

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

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

Long-term debt fees and charges were as follows (in millions):

	December 31,
	2020		2019		2018
Unused credit facility and letter of credit participation(1)	$	1.4	$	1.2	$	1.2
Amortization of debt issuance costs(1)	0.8		0.8		0.8

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(1)    Included in interest expense, net.