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Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2021
Fair Value Disclosures [Abstract] |
Schedule of financial instrument fair value | The estimated fair value of financial instruments at December 31, 2021 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 |  | $ | 687.7 |  |  | $ | 687.7 |  |  | $ | 687.7 |  |  | $ | — |
Derivative financial instruments: |  |  |  |  |  |  |  |
Assets |  | 7.6 |  |  | 7.6 |  |  | — |  |  | 7.6 |
Liabilities |  | 2.7 |  |  | 2.7 |  |  | — |  |  | 2.7 |
Debt (a) |  | 1,863.7 |  |  | 2,003.2 |  |  | 1,690.1 |  |  | 313.1 |
The estimated fair value of financial instruments at December 31, 2020 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 |  | $ | 645.9 |  |  | $ | 645.9 |  |  | $ | 645.9 |  |  | $ | — |
Derivative financial instruments: |  |  |  |  |  |  |  |
Assets |  | 4.8 |  |  | 4.8 |  |  | — |  |  | 4.8 |
Liabilities |  | 4.0 |  |  | 4.0 |  |  | — |  |  | 4.0 |
Debt (a) |  | 1,629.1 |  |  | 1,847.7 |  |  | 1,594.2 |  |  | 253.5 |
(a)The total carrying amount for debt 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. The December 31, 2020 debt carrying value includes $46.8 million for the unamortized balance of the portion of the 2025 Convertible Notes recorded in stockholders’ equity due to the flexible settlement feature of the notes (see Note 10).

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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