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FAIR VALUE MEASUREMENTS (Tables) | 9 Months Ended
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Sep. 30, 2017
Fair Value Disclosures [Abstract] |
Assets Measured at Fair Value on Recurring Basis | The Company’s assets which were measured at fair value on a recurring basis as of September 30, 2017 and December 31, 2016 were determined using the inputs described above and are as follows (in millions):
|  |  |  |  | Fair Value Measurements Using |
|  | Carrying Value |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
September 30, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Classified as current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and money market funds |  | $ | 269.4 |  |  | $ | 269.4 |  |  | $ | — |  |  | $ | — |
Certificates of deposit |  |  | 0.2 |  |  |  | 0.2 |  |  |  | — |  |  |  | — |
Commercial paper |  |  | 66.7 |  |  |  | — |  |  |  | 66.7 |  |  |  | — |
Securities of government-sponsored entities |  |  | 12.5 |  |  |  | — |  |  |  | 12.5 |  |  |  | — |
Corporate debt securities |  |  | 163.7 |  |  |  | — |  |  |  | 163.7 |  |  |  | — |
Subtotal |  |  | 512.5 |  |  |  | 269.6 |  |  |  | 242.9 |  |  |  | — |
Classified as long-term assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  |  | 3.0 |  |  |  | 3.0 |  |  |  | — |  |  |  | — |
Securities of government-sponsored entities |  |  | 11.0 |  |  |  | — |  |  |  | 11.0 |  |  |  | — |
Corporate debt securities |  |  | 199.3 |  |  |  | — |  |  |  | 199.3 |  |  |  | — |
Total |  |  | 725.8 |  |  |  | 272.6 |  |  |  | 453.2 |  |  |  | — |
Less cash, cash equivalents and restricted cash |  |  | (272.4 | ) |  |  | (272.4 | ) |  |  | — |  |  |  | — |
Total investments |  | $ | 453.4 |  |  | $ | 0.2 |  |  | $ | 453.2 |  |  | $ | — |
December 31, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Classified as current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and money market funds |  | $ | 73.6 |  |  | $ | 73.6 |  |  | $ | — |  |  | $ | — |
Certificates of deposit |  |  | 1.0 |  |  |  | 1.0 |  |  |  | — |  |  |  | — |
Commercial paper |  |  | 49.2 |  |  |  | — |  |  |  | 49.2 |  |  |  | — |
Securities of government-sponsored entities |  |  | 5.4 |  |  |  | — |  |  |  | 5.4 |  |  |  | — |
Corporate debt securities |  |  | 178.1 |  |  |  | — |  |  |  | 178.1 |  |  |  | — |
Subtotal |  |  | 307.3 |  |  |  | 74.6 |  |  |  | 232.7 |  |  |  | — |
Classified as long-term assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  |  | 4.9 |  |  |  | 4.9 |  |  |  | — |  |  |  | — |
Securities of government-sponsored entities |  |  | 7.5 |  |  |  | — |  |  |  | 7.5 |  |  |  | — |
Corporate debt securities |  |  | 36.0 |  |  |  | — |  |  |  | 36.0 |  |  |  | — |
Total |  |  | 355.7 |  |  |  | 79.5 |  |  |  | 276.2 |  |  |  | — |
Less cash, cash equivalents and restricted cash |  |  | (88.1 | ) |  |  | (78.5 | ) |  |  | (9.6 | ) |  |  | — |
Total investments |  | $ | 267.6 |  |  | $ | 1.0 |  |  | $ | 266.6 |  |  | $ | — |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: 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 Reference 3: 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 + Details
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