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Fair Value of Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2024
Fair Value Disclosures [Abstract] |
Fair Value By Balance Sheet Grouping | The estimated fair value of financial instruments at March 31, 2024 was as follows:
|  |  | Fair Value Measurements at Reporting Date Using
(In millions) | Total Carrying Amount |  | Total Estimated Fair Value |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Observable Inputs (Level 2)
Cash and cash equivalents | $ | 394.4 |  |  | $ | 394.4 |  |  | $ | 394.4 |  |  | $ | — |
Derivative financial instruments: |  |  |  |  |  |  |
Assets | 0.5 |  |  | 0.5 |  |  | — |  |  | 0.5 |
Liabilities | 10.7 |  |  | 10.7 |  |  | — |  |  | 10.7 |
Debt (a) | 2,192.0 |  |  | 2,836.8 |  |  | 2,536.2 |  |  | 300.6 |
The estimated fair value of financial instruments at December 31, 2023 was as follows:
|  |  | Fair Value Measurements at Reporting Date Using
(In millions) | Total Carrying Amount |  | Total Estimated Fair Value |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Observable Inputs (Level 2)
Cash and cash equivalents | $ | 743.9 |  |  | $ | 743.9 |  |  | $ | 743.9 |  |  | $ | — |
Derivative financial instruments: |  |  |  |  |  |  |
Assets | 0.9 |  |  | 0.9 |  |  | — |  |  | 0.9 |
Liabilities | 14.2 |  |  | 14.2 |  |  | — |  |  | 14.2 |
Debt (a) | 2,199.2 |  |  | 2,746.7 |  |  | 2,438.9 |  |  | 307.8 |
(a)The total carrying amount for debt for both periods excludes debt issuance costs related to the recognized debt liability which is presented in the consolidated balance sheet as a direct reduction from the carrying amount of the debt liability.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-11 + Details
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