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FINANCIAL INSTRUMENTS (Tables) | 6 Months Ended
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Jun. 30, 2018
Investments, All Other Investments [Abstract] |
Summary of Cash and Available-For-Sale Securities | The following tables summarize the Company’s cash and available-for-sale marketable securities’ amortized cost, gross unrealized gains, gross unrealized losses, and fair value by significant investment category reported as cash and cash equivalents, short-term, or long-term investments as of June 30, 2018, and December 31, 2017 (in millions):
|  |  |  |  |  |  |  |  | Reported as:
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Cash and Cash Equivalents |  | Short- term Investments |  | Long- term Investments
June 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ | 242.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 242.0 |  |  | $ | 242.0 |  |  | $ | — |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds | 738.7 |  |  | — |  |  | — |  |  | 738.7 |  |  | 738.7 |  |  | — |  |  | — |
U.S. treasuries | 1,192.5 |  |  | — |  |  | (8.1 | ) |  | 1,184.4 |  |  | 63.4 |  |  | 627.2 |  |  | 493.8 |
Subtotal | 1,931.2 |  |  | — |  |  | (8.1 | ) |  | 1,923.1 |  |  | 802.1 |  |  | 627.2 |  |  | 493.8 |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper | 170.2 |  |  | — |  |  | — |  |  | 170.2 |  |  | 112.9 |  |  | 57.3 |  |  | — |
Corporate debt securities | 1,036.2 |  |  | 0.4 |  |  | (6.1 | ) |  | 1,030.5 |  |  | 3.2 |  |  | 581.1 |  |  | 446.2 |
U.S. government agencies | 882.3 |  |  | 0.2 |  |  | (6.2 | ) |  | 876.3 |  |  | 43.3 |  |  | 454.1 |  |  | 378.9 |
Municipal securities | 17.5 |  |  | — |  |  | — |  |  | 17.5 |  |  | — |  |  | 9.3 |  |  | 8.2 |
Subtotal | 2,106.2 |  |  | 0.6 |  |  | (12.3 | ) |  | 2,094.5 |  |  | 159.4 |  |  | 1,101.8 |  |  | 833.3 |
Total assets measured at fair value | $ | 4,279.4 |  |  | $ | 0.6 |  |  | $ | (20.4 | ) |  | $ | 4,259.6 |  |  | $ | 1,203.5 |  |  | $ | 1,729.0 |  |  | $ | 1,327.1 |
|  |  |  |  |  |  |  |  | Reported as:
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Cash and Cash Equivalents |  | Short- term Investments |  | Long- term Investments
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ | 197.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 197.7 |  |  | $ | 197.7 |  |  | $ | — |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds | 445.0 |  |  | — |  |  | — |  |  | 445.0 |  |  | 445.0 |  |  | — |  |  | — |
U.S. treasuries | 1,029.1 |  |  | — |  |  | (4.7 | ) |  | 1,024.4 |  |  | 5.5 |  |  | 396.2 |  |  | 622.7 |
Subtotal | 1,474.1 |  |  | — |  |  | (4.7 | ) |  | 1,469.4 |  |  | 450.5 |  |  | 396.2 |  |  | 622.7 |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper | 38.4 |  |  | — |  |  | — |  |  | 38.4 |  |  | — |  |  | 38.4 |  |  | — |
Corporate debt securities | 946.6 |  |  | 0.2 |  |  | (4.4 | ) |  | 942.4 |  |  | — |  |  | 403.9 |  |  | 538.5 |
U.S. government agencies | 901.3 |  |  | — |  |  | (4.4 | ) |  | 896.9 |  |  | — |  |  | 311.7 |  |  | 585.2 |
Non-U.S. government securities | 2.5 |  |  | — |  |  | — |  |  | 2.5 |  |  | — |  |  | 2.5 |  |  | — |
Municipal securities | 301.1 |  |  | — |  |  | (1.9 | ) |  | 299.2 |  |  | — |  |  | 159.7 |  |  | 139.5 |
Subtotal | 2,189.9 |  |  | 0.2 |  |  | (10.7 | ) |  | 2,179.4 |  |  | — |  |  | 916.2 |  |  | 1,263.2 |
Total assets measured at fair value | $ | 3,861.7 |  |  | $ | 0.2 |  |  | $ | (15.4 | ) |  | $ | 3,846.5 |  |  | $ | 648.2 |  |  | $ | 1,312.4 |  |  | $ | 1,885.9 |
Summary of Contractual Maturities of Cash Equivalents and Available-For-Sale Investments | The following table summarizes the contractual maturities of the Company’s cash equivalents and available-for-sale investments (excluding cash and money market funds), as of June 30, 2018 (in millions):
| Amortized Cost |  | Fair Value
Mature in less than one year | $ | 1,957.5 |  |  | $ | 1,951.8 |
Mature in one to five years | 1,341.2 |  |  | 1,327.1 |
Total | $ | 3,298.7 |  |  | $ | 3,278.9 |
Gross Notional Amounts for Derivatives and Aggregate Gross Fair Value Outstanding | The notional amounts for derivative instruments provide one measure of the transaction volume. Total gross notional amounts (in USD) for outstanding derivatives and aggregate gross fair value at the end of each period were as follows (in millions):
| Derivatives Designated as Hedging Instruments |  | Derivatives Not Designated as Hedging Instruments
| June 30, 2018 |  | December 31, 2017 |  | June 30, 2018 |  | December 31, 2017
Notional amounts: |  |  |  |  |  |  |
Forward contracts | $ | 138.1 |  |  | $ | 128.5 |  |  | $ | 143.3 |  |  | $ | 168.4 |
Gross fair value recorded in: |  |  |  |  |  |  |
Prepaids and other current assets | $ | 4.5 |  |  | $ | 0.9 |  |  | $ | 2.9 |  |  | $ | 1.2 |
Other accrued liabilities | $ | 0.8 |  |  | $ | 2.9 |  |  | $ | 0.8 |  |  | $ | 4.6 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41641-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41678-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41638-113959 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579240-113959 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41620-113959 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(n)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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