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Fair Value of Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2018
Fair Value Disclosures [Abstract] |
Fair Value By Balance Sheet Grouping | The estimated fair value of financial instruments at March 31, 2018 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 | $ | 109.9 |  |  | $ | 109.9 |  |  | $ | 109.9 |  |  | $ | — |
Derivative financial instruments: |  |  |  |  |  |  |
Assets | 15.6 |  |  | 15.6 |  |  | — |  |  | 15.6 |
Liabilities | 4.5 |  |  | 4.5 |  |  | — |  |  | 4.5 |
Debt (a) | 1,611.5 |  |  | 1,908.8 |  |  | 1,734.8 |  |  | 174.0 |
The estimated fair value of financial instruments at December 31, 2017 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 | $ | 141.6 |  |  | $ | 141.6 |  |  | $ | 141.6 |  |  | $ | — |
Derivative financial instruments: |  |  |  |  |  |  |
Assets | 16.5 |  |  | 16.5 |  |  | — |  |  | 16.5 |
Liabilities | 5.5 |  |  | 5.5 |  |  | — |  |  | 5.5 |
Debt (a) | 1,553.8 |  |  | 1,853.2 |  |  | 1,736.9 |  |  | 116.3 |
(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.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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