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FAIR VALUE MEASUREMENTS | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
FAIR VALUE MEASUREMENTS | NOTE 4. FAIR VALUE MEASUREMENTS Fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, a three-tier fair value hierarchy has been established, which prioritizes the inputs used in measuring fair value as follows:
Level 1: |  | Observable inputs such as quoted prices in active markets;
Level 2: |  | Inputs include quoted prices for similar instruments in active markets and/or quoted prices for identical or similar instruments in markets that are not active near the measurement date; and
Level 3: |  | Unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.
The Company classifies its cash equivalents and available for sale investments within Level 1 or Level 2. The fair value of the Company’s high quality investment grade corporate debt securities is determined using proprietary valuation models and analytical tools. These valuation models and analytical tools use market pricing or prices for similar instruments that are both objective and publicly available, including matrix pricing or reported trades, benchmark yields, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids and/or offers. The Company did not reclassify any investments between levels in the fair value hierarchy during the years ended December 31, 2017 and 2016. The Company’s assets which are measured at fair value on a recurring basis as of December 31, 2017 and 2016 were determined using the inputs described above (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) |
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 |  |  | $ | — |
December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Classified as current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and money market funds |  | $ | 170.2 |  |  | $ | 170.2 |  |  | $ | — |  |  | $ | — |
Commercial paper |  |  | 159.9 |  |  |  | — |  |  |  | 159.9 |  |  |  | — |
Securities of government-sponsored entities |  |  | 7.5 |  |  |  | — |  |  |  | 7.5 |  |  |  | — |
Corporate debt securities |  |  | 178.4 |  |  |  | — |  |  |  | 178.4 |  |  |  | — |
Subtotal |  |  | 516.0 |  |  |  | 170.2 |  |  |  | 345.8 |  |  |  | — |
Classified as long-term assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and money market funds |  |  | 1.5 |  |  |  | 1.5 |  |  |  |  |  |  |  |  |
Certificates of deposit |  |  | 3.0 |  |  |  | 3.0 |  |  |  | — |  |  |  | — |
Securities of government-sponsored entities |  |  | 10.9 |  |  |  | — |  |  |  | 10.9 |  |  |  | — |
Corporate debt securities |  |  | 236.4 |  |  |  | — |  |  |  | 236.4 |  |  |  | — |
Total |  |  | 767.8 |  |  |  | 174.7 |  |  |  | 593.1 |  |  |  | — |
Less cash, cash equivalents and restricted cash |  |  | (259.2 | ) |  |  | (174.6 | ) |  |  | (84.6 | ) |  |  | — |
Total investments |  | $ | 508.6 |  |  | $ | 0.1 |  |  | $ | 508.5 |  |  | $ | — |
The fair value of the Company’s outstanding 2.25% convertible senior notes due 2024 (the 2024 Notes) at December 31, 2017, calculated utilizing market quotations from an over-the-counter trading market for these notes (Level 2), was approximately $662.1 million. The carrying value of the 2024 Notes is discussed in Note 8 to the Consolidated Financial Statements included in this Annual Report .

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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