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Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2018
Fair Value Disclosures [Abstract] |
Valuation of Financial Instruments Recorded on Fair Value Basis | The following table summarizes the valuation of our financial instruments recorded on a fair value basis as of December 31, 2017 and March 31, 2018:
|  | Fair Value Measurements |
|  |  |  |  |  | Quoted |  |  | Significant |  |  |  |  |
|  |  |  |  |  | prices in |  |  | other |  |  | Significant |
|  |  |  |  |  | active |  |  | observable |  |  | unobservable |
|  |  |  |  |  | markets |  |  | inputs |  |  | inputs |
|  | Total |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
|  | (In millions) |
Asset: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2017 - |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncurrent marketable securities (See Note 4) |  | $ | 10.7 |  |  | $ | 10.7 |  |  | $ | - |  |  | $ | - |
March 31, 2018 - |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncurrent marketable securities (See Note 4) |  | $ | 10.5 |  |  | $ | 10.5 |  |  | $ | - |  |  | $ | - |
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 as of December 31, 2017 and March 31, 2018.
|  | December 31, 2017 |  |  | March 31, 2018 |
|  | Carrying amount |  |  | Fair value |  |  | Carrying amount |  |  | Fair value |
|  | (In millions) |
Cash, cash equivalents and restricted cash |  | $ | 323.7 |  |  | $ | 323.7 |  |  | $ | 365.9 |  |  | $ | 365.9 |
Long-term debt - |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed rate Senior Notes |  |  | 471.1 |  |  |  | 495.1 |  |  |  | 484.9 |  |  |  | 506.6 |
Common stockholders' equity |  |  | 754.3 |  |  |  | 2,986.8 |  |  |  | 818.3 |  |  |  | 2,619.4 |

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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://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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- 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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