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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [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 or short-term or long-term investments as of December 31, 2017, and 2016 (in millions):
|  |  |  |  |  |  |  |  | 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 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 |
|  |  |  |  |  |  |  |  | Reported as:
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Cash and Cash Equivalents |  | Short-term Investments |  | Long-term Investments
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ | 227.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 227.7 |  |  | $ | 227.7 |  |  | $ | — |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds | 612.4 |  |  | — |  |  | — |  |  | 612.4 |  |  | 612.4 |  |  | — |  |  | — |
U.S. treasuries | 625.9 |  |  | 0.1 |  |  | (2.0 | ) |  | 624.0 |  |  | 157.9 |  |  | 168.4 |  |  | 297.7 |
Subtotal | 1,238.3 |  |  | 0.1 |  |  | (2.0 | ) |  | 1,236.4 |  |  | 770.3 |  |  | 168.4 |  |  | 297.7 |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper | 139.6 |  |  | — |  |  | — |  |  | 139.6 |  |  | 31.1 |  |  | 108.5 |  |  | — |
Corporate securities | 1,471.8 |  |  | 0.7 |  |  | (5.0 | ) |  | 1,467.5 |  |  | 2.9 |  |  | 555.4 |  |  | 909.2 |
U.S. government agencies | 938.7 |  |  | 0.5 |  |  | (2.9 | ) |  | 936.3 |  |  | — |  |  | 342.7 |  |  | 593.6 |
Non-U.S. government securities | 18.5 |  |  | — |  |  | — |  |  | 18.5 |  |  | — |  |  | 16.0 |  |  | 2.5 |
Municipal securities | 815.4 |  |  | — |  |  | (3.5 | ) |  | 811.9 |  |  | 4.6 |  |  | 327.0 |  |  | 480.3 |
Subtotal | 3,384.0 |  |  | 1.2 |  |  | (11.4 | ) |  | 3,373.8 |  |  | 38.6 |  |  | 1,349.6 |  |  | 1,985.6 |
Total assets measured at fair value | $ | 4,850.0 |  |  | $ | 1.3 |  |  | $ | (13.4 | ) |  | $ | 4,837.9 |  |  | $ | 1,036.6 |  |  | $ | 1,518.0 |  |  | $ | 2,283.3 |
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), at December 31, 2017 (in millions):
| Amortized Cost |  | Fair Value
Mature in less than one year | $ | 1,320.7 |  |  | $ | 1,317.9 |
Mature in one to five years | 1,898.3 |  |  | 1,885.9 |
Total | $ | 3,219.0 |  |  | $ | 3,203.8 |
Schedule Of Available-For-Sale Investments With Unrealized Losses | The following tables present the breakdown of the available-for-sale investments with unrealized losses at December 31, 2017, and 2016 (in millions):
| Unrealized losses less than 12 months |  | Unrealized losses 12 months or greater |  | Total
December 31, 2017 | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Corporate securities | $ | 567.6 |  |  | $ | (2.1 | ) |  | $ | 277.0 |  |  | $ | (2.3 | ) |  | $ | 844.6 |  |  | $ | (4.4 | )
U.S. treasuries | 763.5 |  |  | (2.5 | ) |  | 206.2 |  |  | (2.2 | ) |  | 969.7 |  |  | (4.7 | )
U.S. government agencies | 428.9 |  |  | (1.3 | ) |  | 345.5 |  |  | (3.1 | ) |  | 774.4 |  |  | (4.4 | )
Municipal securities | 236.3 |  |  | (1.3 | ) |  | 51.7 |  |  | (0.6 | ) |  | 288.0 |  |  | (1.9 | )
| $ | 1,996.3 |  |  | $ | (7.2 | ) |  | $ | 880.4 |  |  | $ | (8.2 | ) |  | $ | 2,876.7 |  |  | $ | (15.4 | )
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |
Corporate securities | $ | 1,056.1 |  |  | $ | (5.0 | ) |  | $ | — |  |  | $ | — |  |  | $ | 1,056.1 |  |  | $ | (5.0 | )
U.S. treasuries | 357.1 |  |  | (2.0 | ) |  | — |  |  | — |  |  | 357.1 |  |  | (2.0 | )
U.S. government agencies | 538.2 |  |  | (2.9 | ) |  | — |  |  | — |  |  | 538.2 |  |  | (2.9 | )
Municipal securities | 728.8 |  |  | (3.5 | ) |  | — |  |  | — |  |  | 728.8 |  |  | (3.5 | )
| $ | 2,680.2 |  |  | $ | (13.4 | ) |  | $ | — |  |  | $ | — |  |  | $ | 2,680.2 |  |  | $ | (13.4 | )
Derivative Instruments Used to Hedge against Balance Sheet Foreign Currency Exposures | These derivative instruments are used to hedge against balance sheet foreign currency exposures. The related gains and losses were as follows (in millions):
| Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Recognized gains (losses) in interest and other income, net | $ | (9.2 | ) |  | $ | 6.4 |  |  | $ | 7.0 |
Foreign exchange gains (losses) related to balance sheet re-measurement | $ | 9.7 |  |  | $ | (5.6 | ) |  | $ | (7.9 | )
Gross Notional Amounts for Outstanding Derivatives | Total gross notional amounts (in USD) for derivatives and aggregate gross fair value outstanding at the end of each period were as follows (in millions):
| Derivatives Designated as Hedging Instruments |  | Derivatives Not Designated as Hedging Instruments
| December 31, 2017 |  | December 31, 2016 |  | December 31, 2017 |  | December 31, 2016
Notional amounts: |  |  |  |  |  |  |
Forward contracts | $ | 128.5 |  |  | $ | 109.7 |  |  | $ | 168.4 |  |  | $ | 143.7 |
Gross fair value recorded in: |  |  |  |  |  |  |
Prepaid and other current assets | $ | 0.9 |  |  | $ | 6.2 |  |  | $ | 1.2 |  |  | $ | 5.6 |
Other accrued liabilities | $ | 2.9 |  |  | $ | 1.0 |  |  | $ | 4.6 |  |  | $ | 0.6 |

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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 the notional amounts of outstanding derivative positions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 + Details
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