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FINANCIAL INSTRUMENTS (Tables) | 9 Months Ended
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Sep. 30, 2019
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 September 30, 2019, and December 31, 2018 (in millions):
|  |  |  |  |  |  |  |  | Reported as: |  |  |  |
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Cash and Cash Equivalents |  | Short- term Investments |  | Long- term Investments
September 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ | 325.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 325.2 |  |  | $ | 325.2 |  |  | $ | — |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds | 641.4 |  |  | — |  |  | — |  |  | 641.4 |  |  | 641.4 |  |  | — |  |  | — |
U.S. treasuries | 1,846.9 |  |  | 10.6 |  |  | (0.7) |  |  | 1,856.8 |  |  | — |  |  | 932.8 |  |  | 924.0 |
Subtotal | 2,488.3 |  |  | 10.6 |  |  | (0.7) |  |  | 2,498.2 |  |  | 641.4 |  |  | 932.8 |  |  | 924.0 |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper | 117.5 |  |  | — |  |  | — |  |  | 117.5 |  |  | 3.0 |  |  | 114.5 |  |  | — |
Corporate debt securities | 1,958.9 |  |  | 18.0 |  |  | (0.4) |  |  | 1,976.5 |  |  | — |  |  | 637.0 |  |  | 1,339.5 |
U.S. government agencies | 481.1 |  |  | 1.0 |  |  | (0.4) |  |  | 481.7 |  |  | — |  |  | 227.9 |  |  | 253.8 |
Municipal securities | 31.2 |  |  | 0.3 |  |  | — |  |  | 31.5 |  |  | — |  |  | 15.8 |  |  | 15.7 |
Subtotal | 2,588.7 |  |  | 19.3 |  |  | (0.8) |  |  | 2,607.2 |  |  | 3.0 |  |  | 995.2 |  |  | 1,609.0 |
Total assets measured at fair value | $ | 5,402.2 |  |  | $ | 29.9 |  |  | $ | (1.5) |  |  | $ | 5,430.6 |  |  | $ | 969.6 |  |  | $ | 1,928.0 |  |  | $ | 2,533.0 |
|  |  |  |  |  |  |  |  | Reported as: |  |  |  |
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Cash and Cash Equivalents |  | Short- term Investments |  | Long- term Investments
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ | 269.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 269.4 |  |  | $ | 269.4 |  |  | $ | — |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds | 569.1 |  |  | — |  |  | — |  |  | 569.1 |  |  | 569.1 |  |  | — |  |  | — |
U.S. treasuries | 1,477.8 |  |  | 1.7 |  |  | (5.3) |  |  | 1,474.2 |  |  | 10.0 |  |  | 897.8 |  |  | 566.4 |
Subtotal | 2,046.9 |  |  | 1.7 |  |  | (5.3) |  |  | 2,043.3 |  |  | 579.1 |  |  | 897.8 |  |  | 566.4 |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper | 110.7 |  |  | — |  |  | — |  |  | 110.7 |  |  | 1.4 |  |  | 109.3 |  |  | — |
Corporate debt securities | 1,607.8 |  |  | 1.3 |  |  | (4.8) |  |  | 1,604.3 |  |  | 8.0 |  |  | 724.5 |  |  | 871.8 |
U.S. government agencies | 791.8 |  |  | 0.3 |  |  | (3.8) |  |  | 788.3 |  |  | — |  |  | 468.9 |  |  | 319.4 |
Municipal securities | 18.4 |  |  | — |  |  | — |  |  | 18.4 |  |  | — |  |  | 4.7 |  |  | 13.7 |
Subtotal | 2,528.7 |  |  | 1.6 |  |  | (8.6) |  |  | 2,521.7 |  |  | 9.4 |  |  | 1,307.4 |  |  | 1,204.9 |
Total assets measured at fair value | $ | 4,845.0 |  |  | $ | 3.3 |  |  | $ | (13.9) |  |  | $ | 4,834.4 |  |  | $ | 857.9 |  |  | $ | 2,205.2 |  |  | $ | 1,771.3 |
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 September 30, 2019 (in millions):
| Amortized Cost |  | Fair Value
Mature in less than one year | $ | 1,976.2 |  |  | $ | 1,980.0 |
Mature in one to five years | 2,459.4 |  |  | 2,484.0 |
Total | $ | 4,435.6 |  |  | $ | 4,464.0 |
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 |  |
| September 30, 2019 |  | December 31, 2018 |  | September 30, 2019 |  | December 31, 2018
Notional amounts: |  |  |  |  |  |  |
Forward contracts | $ | 192.6 |  |  | $ | 183.0 |  |  | $ | 255.4 |  |  | $ | 182.7 |
Gross fair value recorded in: |  |  |  |  |  |  |
Prepaids and other current assets | $ | 4.5 |  |  | $ | 3.1 |  |  | $ | 3.3 |  |  | $ | 4.1 |
Other accrued liabilities | $ | 0.6 |  |  | $ | 0.9 |  |  | $ | 0.6 |  |  | $ | 1.1 |

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