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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2017
Carrying Value and Fair Value of Debt | The carrying value and fair value of debt as of December 31, 2017 and 2016 were as follows:
(In millions) |  | December 31, 2017 |  |  | December 31, 2016 |
|  | Carrying Value |  |  | Fair Value |  |  | Carrying Value |  |  | Fair Value |
Revolving credit facility |  | $ | 615.0 |  |  | $ | 615.0 |  |  | $ | 540.0 |  |  | $ | 540.0 |
Senior Notes, net of underwriting commissions and price discounts |  |  | 892.6 |  |  |  | 926.3 |  |  |  | 891.1 |  |  |  | 919.2 |
Assets and Liabilities Measured at Fair Value on Recurring Basis | Assets and liabilities measured at fair value on a recurring basis as of December 31, 2017 and 2016 were as follows:
(In millions) |  | Fair Value |
|  | 2017 |  |  | 2016 |
Assets: |  |  |  |  |  |  |  |
Derivative asset financial instruments (level 2) |  | $ | 1.0 |  |  | $ | 3.4 |
Deferred compensation program assets (level 2) |  |  | 7.5 |  |  |  | 4.5 |
Total assets |  | $ | 8.5 |  |  | $ | 7.9 |
Liabilities: |  |  |  |  |  |  |  |
Derivative liability financial instruments (level 2) |  | $ | 6.4 |  |  | $ | 3.1 |

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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