At March 31, 2020 and December 31, 2019, debt consisted of the following (in millions):

	March 31,			December 31,
	2020			2019
Senior secured credit facilities, weighted-average interest rate of 2.74% and 4.05%, respectively	$	5,103.0		$	5,198.7
5.5% senior notes due 2027		2,000.0			2,000.0
Senior secured credit facilities revolving portion, weighted average interest rate of 2.96%		246.0			—
Other indebtedness		24.0			25.6
Unamortized original issue discount and debt issuance costs		(66.7	)		(70.2	)
		7,306.3			7,154.1
Less: current portion of long-term debt		320.0			76.3
Long-term debt	$	6,986.3		$	7,077.8

On January 31, 2020, we entered into an amendment (the “Amendment”) to our senior secured credit agreement dated April 16, 2018. Pursuant to the Amendment, the interest rate margin applicable to Term Loan B was reduced from LIBOR plus 2.25% to LIBOR plus 1.75%. No changes were made to the financial covenants, outstanding principal amounts or the scheduled amortization.

The Amendment was evaluated in accordance with FASB Accounting Standards Codification 470-50, Debt-Modifications and Extinguishments, for debt modification and extinguishment accounting. We accounted for the debt re-pricing as a debt modification with respect to amounts that remained obligations of the same lender in the syndicate with minor changes in cash flows and as a debt extinguishment with respect to amounts that were obligations of lenders that exited the syndicate or remained in the syndicate but experienced a change in cash flows of greater than 10%.

We recorded a $2.8 million loss on extinguishment of debt in the three months ended March 31, 2020 in connection with the Amendment. The loss on extinguishment of debt includes the write-off of a portion of the unamortized capitalized financing fees related to our senior secured credit agreement for amounts accounted for as a debt extinguishment, as well as new financing fees for amounts accounted for as a debt modification.

On March 24, 2020, we borrowed $211.0 million under our Revolving Credit Facility as a precautionary measure to increase liquidity and preserve financial flexibility in light of current uncertainty resulting from the COVID-19 pandemic. We borrowed $35.0 million under the Revolving Credit Facility earlier in March for normal seasonal cash flow needs. As a result of these borrowings and previously outstanding letters of credit, we do not currently have any further availability under our Revolving Credit Facility.

The carrying amounts and fair values of financial instruments are as follows (in millions):

	March 31, 2020				December 31, 2019
	Carrying		Fair		Carrying		Fair
	Amount		Value		Amount		Value
Financial liabilities:
Senior secured credit facilities	$	5,103.0	$	4,759.7	$	5,198.7	$	5,231.7
5.5% senior notes due 2027		2,000.0		2,062.5		2,000.0		2,135.0
Senior secured credit facilities, revolving portion		246.0		221.7		—		—
Other indebtedness		24.0		24.2		25.6		25.9

The above fair values, which are Level 2 liabilities, were computed based on comparable quoted market prices. The fair values of cash, accounts receivable, net, short-term borrowings, and accounts payable approximate the carrying amounts due to the short-term maturities of these instruments.