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Debt | 3 Months Ended
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Mar. 31, 2021
Debt Disclosure [Abstract] |
Debt | Debt In August 2020, we issued and sold $1.250 billion aggregate principal amount of senior unsecured notes due 2030 and $750 million aggregate principal amount of senior unsecured notes due 2050. Long-term debt in connection with our senior unsecured notes (collectively, the "Notes"), net of underwriting discounts and offering expenses, consists of the following:
| March 31, |  | December 31,
(In millions) | 2021 |  | 2020
1.750% Senior Notes due September 2030 | $ | 1,239.0 |  |  | $ | 1,238.7 |
2.800% Senior Notes due September 2050 | 739.9 |  |  | 739.8 |
| $ | 1,978.9 |  |  | $ | 1,978.5 |
Interest expense related to the Notes for the three months ended March 31, 2021 was $11.1 million.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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