	December 31,			March 31,
	2019			2020
	(In millions)
Valhi:
Contran credit facility	$	313.0		$	313.0
Subsidiary debt:
Kronos:
Senior Notes		442.6			435.1
Tremont:
Promissory note payable		2.0			.5
BMI:
Bank loan - Western Alliance Bank		17.2			17.2
LandWell:
Note payable to Western Alliance Business Trust		15.0		14.9
Note payable to the City of Henderson		1.6			-
Other		2.9			2.8
Total subsidiary debt		481.3			470.5
Total debt		794.3			783.5
Less current maturities		(4.9	)		(3.8	)
Total long-term debt	$	789.4		$	779.7

Valhi – Contran credit facility – During the first three months of 2020, we had no borrowings or repayments under this facility. The average interest rate on the existing balance for the three months ended March 31, 2020 was 5.4%. At March 31, 2020, the interest rate was 4.25% and $47.0 million was available for borrowing under this facility.

Kronos – Senior Notes - At March 31, 2020, the carrying value of Kronos’ 3.75% Senior Secured Notes due September 15, 2025 (€400 million aggregate principal amount outstanding) is stated net of unamortized debt issuance costs of $4.9 million.

North American and European revolving credit facilities– During the first three months of 2020, Kronos had no borrowings or repayments under its North American revolving credit facility and its European revolving credit facility. At March 31, 2020, approximately $117.2 million was available for borrowing under the North American revolving credit facility. Kronos’ European revolving credit facility requires the maintenance of certain financial ratios, and one of such requirements is based on the ratio of net debt to last twelve months earnings before income tax, interest, depreciation and amortization expense (EBITDA) of the borrowers. Based upon the borrowers’ last twelve months EBITDA as of March 31, 2020 and the net debt to EBITDA financial test, the full €90.0 million of the credit facility ($99.0 million) was available for borrowing at March 31, 2020.

Tremont – Promissory note payable – During the first three months of 2020, Tremont prepaid (without penalty) $1.5 million principal amount on the note as required under the terms of the note agreement. The remaining outstanding balance of $.5 million was repaid in April 2020.

LandWell – In January 2020, LandWell fully prepaid (without penalty) its promissory note payable to the City of Henderson, Nevada.

Restrictions and other – Certain of the credit facilities with unrelated, third-party lenders described above require the respective borrowers to maintain minimum levels of equity, require the maintenance of certain financial ratios, limit dividends and additional indebtedness and contain other provisions and restrictive covenants customary in lending transactions of this type. We are in compliance with all of our debt covenants at March 31, 2020.