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FAIR VALUE MEASUREMENTS (Tables) | 3 Months Ended
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Mar. 31, 2019
Fair Value Disclosures [Abstract] |
Summary of Financial Instruments Measured at Fair Value on a Recurring Basis | The following table summarizes the Company's financial instruments which are measured at fair value on a recurring basis (in millions):
March 31, 2019 | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |  |  |  |  |
Cash equivalents | $ | 7.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 7.0 |
Available-for-sale investments: |  |  |  |  |  |  |  |
Corporate debt securities | — |  |  | 431.7 |  |  | — |  |  | 431.7 |
Asset-backed securities | — |  |  | 102.2 |  |  | — |  |  | 102.2 |
U.S. government and agency securities | 19.7 |  |  | 59.8 |  |  | — |  |  | 79.5 |
Foreign government bonds | — |  |  | 1.7 |  |  | — |  |  | 1.7 |
Commercial paper | — |  |  | 36.0 |  |  | — |  |  | 36.0 |
Municipal securities | — |  |  | 2.8 |  |  | — |  |  | 2.8 |
Investments held for deferred compensation plans | 76.0 |  |  | — |  |  | — |  |  | 76.0 |
Derivatives | — |  |  | 37.9 |  |  | — |  |  | 37.9 |
| $ | 102.7 |  |  | $ | 672.1 |  |  | $ | — |  |  | $ | 774.8 |
Liabilities |  |  |  |  |  |  |  |  |  |  |
Derivatives | $ | — |  |  | $ | 4.0 |  |  | $ | — |  |  | $ | 4.0 |
Deferred compensation plans | 76.1 |  |  | — |  |  | — |  |  | 76.1 |
Contingent consideration liabilities | — |  |  | — |  |  | 185.3 |  |  | 185.3 |
| $ | 76.1 |  |  | $ | 4.0 |  |  | $ | 185.3 |  |  | $ | 265.4 |
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Cash equivalents | $ | — |  |  | $ | 11.8 |  |  | $ | — |  |  | $ | 11.8 |
Available-for-sale investments: |  |  |  |  |  |  |
Corporate debt securities | — |  |  | 455.6 |  |  | — |  |  | 455.6 |
Asset-backed securities | — |  |  | 110.2 |  |  | — |  |  | 110.2 |
U.S. government and agency securities | 19.6 |  |  | 59.6 |  |  | — |  |  | 79.2 |
Foreign government bonds | — |  |  | 1.7 |  |  | — |  |  | 1.7 |
Commercial paper | — |  |  | 56.7 |  |  | — |  |  | 56.7 |
Municipal securities | — |  |  | 2.8 |  |  | — |  |  | 2.8 |
Investments held for deferred compensation plans | 67.6 |  |  | — |  |  | — |  |  | 67.6 |
Derivatives | — |  |  | 29.9 |  |  | — |  |  | 29.9 |
| $ | 87.2 |  |  | $ | 728.3 |  |  | $ | — |  |  | $ | 815.5 |
Liabilities |  |  |  |  |  |  |  |  |  |  |
Derivatives | $ | — |  |  | $ | 5.2 |  |  | $ | — |  |  | $ | 5.2 |
Deferred compensation plans | 68.5 |  |  | — |  |  | — |  |  | 68.5 |
Contingent consideration liabilities |  |  |  | — |  |  | 178.6 |  |  | 178.6 |
| $ | 68.5 |  |  | $ | 5.2 |  |  | $ | 178.6 |  |  | $ | 252.3 |
Summary of Changes in Fair Value of Contingent Consideration Obligation | The following table summarizes the changes in fair value of the contingent consideration liabilities for the three months ended March 31, 2019 (in millions):
Balance at December 31, 2018 |  | $ | 178.6 |
Changes in fair value |  | 6.7 |
Balance at March 31, 2019 |  | $ | 185.3 |

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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