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Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2021
Fair Value Disclosures [Abstract] |
Financial Instruments not Carried at Fair Value but which Require Fair Value Disclosure | The following table presents the financial instruments that are not carried at fair value but which require fair value disclosure:
|  | December 31, 2020 |  |  | September 30, 2021 |
|  | Carrying amount |  |  | Fair value |  |  | Carrying amount |  |  | Fair value |
|  | (In millions) |
Cash, cash equivalents and restricted cash |  | $ | 362.0 |  |  | $ | 362.0 |  |  | $ | 379.7 |  |  | $ | 379.7 |
Long-term debt - Fixed rate Senior Notes |  |  | 485.7 |  |  |  | 499.9 |  |  |  | 460.4 |  |  |  | 472.4 |

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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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