	March 31,			December 31,
	2021			2020
Current portion of long-term debt
3.375% Senior Notes due 2021	$	300.0		$	300.0
Floating Rate Notes due 2021		-			200.0
Total current portion of long-term debt	$	300.0		$	500.0
Long-term debt
3.150% Senior Notes due 2022	$	750.00		$	750.00
3.700% Senior Notes due 2023		300.0			300.0
3.550% Senior Notes due 2025		2,000.0			2,000.0
3.050% Senior Notes due 2026		600.0			600.0
3.550% Senior Notes due 2030		900.0			900.0
4.250% Senior Notes due 2035		253.4			253.4
5.750% Senior Notes due 2039		317.8			317.8
4.450% Senior Notes due 2045		395.4			395.4
1.414% Euro Notes due 2022		587.7			611.8
2.425% Euro Notes due 2026		587.7			611.8
1.164% Euro Notes due 2027		587.7			611.8
Japan Term Loan A		105.9			113.3
Japan Term Loan B		192.7			206.3
Other long-term debt		3.1			-
Debt discount and issuance costs		(44.9	)		(48.2	)
Adjustment related to interest rate swaps		2.2			3.1
Total long-term debt	$	7,538.7		$	7,626.5

At March 31, 2021, our total current and non-current debt of $7.8 billion consisted of $7.6 billion aggregate principal amount of our senior notes, which included $1.5 billion Euro-denominated senior notes (“Euro Notes”), an 11.7 billion Japanese Yen term loan agreement (“Japan Term Loan A”) and a 21.3 billion Japanese Yen term loan agreement (“Japan Term Loan B”) that will each mature on September 27, 2022, and other debt and fair value adjustments totaling $5.3 million, partially offset by debt discount and issuance costs of $44.9 million.

In the three-month period ended March 31, 2021, we repaid $200.0 million on our Floating Rate Notes due 2021.

On March 20, 2020, we completed the offering of $600.0 million aggregate principal amount of our 3.050% senior notes due on January 15, 2026 and $900.0 million aggregate principal amount of our 3.550% senior notes due on March 20, 2030. Interest payable on the 3.050% senior notes is payable semi-annually, commencing on July 15, 2020 until maturity. Interest payable on the 3.550% senior notes is payable semi-annually, commencing on September 20, 2020 until maturity. The proceeds from the offering, together with cash on hand, were used to repay at maturity the $1.5 billion principal amount of 2.700% senior notes due on April 1, 2020.

We have a revolving credit agreement (the “2019 Credit Agreement”), which contains a five-year unsecured multicurrency revolving facility of $1.5 billion (the “2019 Multicurrency Revolving Facility”). The 2019 Credit Agreement will mature on November 1, 2024, with two one-year extensions exercisable at our discretion and subject to required lender consent. The 2019 Credit Agreement also includes an uncommitted incremental feature allowing us to request an increase of the facility by an aggregate amount of up to $500.0 million. As of March 31, 2021, there were no outstanding borrowings under the 2019 Multicurrency Revolving Facility.

Borrowings under the 2019 Credit Agreement generally bear interest at floating rates. We pay a facility fee on the aggregate amount of the 2019 Multicurrency Revolving Facility. The 2019 Credit Agreement contains customary affirmative and negative covenants and events of default for unsecured financing arrangements, including, among other things, limitations on consolidations, mergers, and sales of assets. On April 23, 2020, we entered into an amendment to the 2019 Credit Agreement to temporarily increase the maximum permitted consolidated indebtedness to consolidated EBITDA ratio (“Consolidated Leverage Ratio”), temporarily increase the interest rate margin applicable to revolving loans and the facility fee, and make other administrative changes. Pursuant to the amendment, the maximum permitted Consolidated Leverage Ratio as of the last day of any period of four consecutive fiscal quarters under the 2019 Credit Agreement is (i) 5.75 to 1.00 for periods ending between April 1, 2020 and including December 31, 2020, (ii) 5.00 to 1.00 for the period ending March 31, 2021, and (iii) 4.50 to 1.00 for periods ending after April 1, 2021 (with such maximum permitted Consolidated Leverage Ratio subject to increase to 5.00 to 1.00 for a period of time in connection with a qualified material acquisition on or after July 1, 2021). We were in compliance with all covenants under the 2019 Credit Agreement as of March 31, 2021. The amendment also increased the interest rate margin applicable to revolving loans and the facility fee, each of which are determined by reference to our senior unsecured long-term debt credit rating, through March 31, 2021. On February 26, 2021, we entered into a further amendment to the 2019 Credit Agreement to facilitate the addition of a new lender while maintaining the amount of the credit facility at $1.5 billion and incorporating certain administrative changes.

On April 23, 2020, we entered into a revolving credit agreement which was an unsecured revolving credit facility of $1.0 billion (the “April 2020 Revolving Facility”). In conjunction with a new revolving credit agreement (the “September 2020 Credit Agreement”) entered into on September 18, 2020, the April 2020 Revolving Facility was terminated. We never borrowed against the April 2020 Revolving Facility. The September 2020 Credit Agreement is a $1.0 billion 364-day unsecured revolving credit facility (the “September 2020 Revolving Facility”). The September 2020 Revolving Facility will be used for general corporate purposes. The September 2020 Credit Agreement matures on September 17, 2021. Borrowings under the September 2020 Credit Agreement generally bear interest at floating rates. We pay a facility fee on the aggregate amount of the September 2020 Revolving Facility. The September 2020 Credit Agreement contains customary affirmative and negative covenants and events of default for an unsecured financing arrangement including, among other things, limitations on consolidations, mergers, and sales of assets. The September 2020 Credit Agreement requires us to maintain a Consolidated Leverage Ratio as of the last day of any period of four consecutive fiscal quarters of no greater than (i) 5.75 to 1.00 for periods ending during the period from September 18, 2020 to and including December 31, 2020, (ii) 5.00 to 1.00 for the period ending March 31, 2021, and (iii) 4.50 to 1.00 for periods ending after April 1, 2021 (with such permitted Consolidated Leverage Ratio subject to increase to 5.00 to 1.00 for a period of time in connection with a qualified material acquisition on or after July 1, 2021). We were in compliance with all covenants under the September 2020 Credit Agreement, as of March 31, 2021. As of March 31, 2021, there were no outstanding borrowings under the September 2020 Credit Agreement.

The estimated fair value of our senior notes as of March 31, 2021, based on quoted prices for the specific securities from transactions in over-the-counter markets (Level 2), was $8,139.7 million. The estimated fair value of Japan Term Loan A and Japan Term Loan B, in the aggregate, as of March 31, 2021, based upon publicly available market yield curves and the terms of the debt (Level 2), was $297.7 million.