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FAIR VALUE MEASUREMENTS - Summary of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Available-for-sale investments | $ 577.5 | $ 683.2
Bank time deposits |  |
Assets |  |
Available-for-sale investments | 0.5 | 0.5
Corporate debt securities |  |
Assets |  |
Available-for-sale investments | 386.5 | 445.5
Asset-backed securities |  |
Assets |  |
Available-for-sale investments | 95.9 | 120.8
U.S. government and agency securities |  |
Assets |  |
Available-for-sale investments | 68.6 | 68.7
Foreign government bonds |  |
Assets |  |
Available-for-sale investments | 3.0 | 3.0
Commercial paper |  |
Assets |  |
Available-for-sale investments | 18.6 | 40.3
Municipal securities |  |
Assets |  |
Available-for-sale investments | 4.4 | 4.4
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis |  |
Assets |  |
Cash equivalents | 164.9 | 75.0
Investments held for deferred compensation plans | 69.4 | 63.7
Derivatives | 19.4 | 4.9
Assets | 831.2 | 826.8
Liabilities |  |
Derivatives | 15.3 | 24.8
Deferred compensation plans | 69.7 | 64.1
Contingent consideration liabilities | 199.0 | 244.3
Liabilities | 284.0 | 333.2
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Bank time deposits |  |
Assets |  |
Available-for-sale investments | 0.5 | 0.5
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Corporate debt securities |  |
Assets |  |
Available-for-sale investments | 386.5 | 445.5
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Asset-backed securities |  |
Assets |  |
Available-for-sale investments | 95.9 | 120.8
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | U.S. government and agency securities |  |
Assets |  |
Available-for-sale investments | 68.6 | 68.7
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Foreign government bonds |  |
Assets |  |
Available-for-sale investments | 3.0 | 3.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Commercial paper |  |
Assets |  |
Available-for-sale investments | 18.6 | 40.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Municipal securities |  |
Assets |  |
Available-for-sale investments | 4.4 | 4.4
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1 |  |
Assets |  |
Cash equivalents | 53.1 | 52.2
Investments held for deferred compensation plans | 69.4 | 63.7
Derivatives | 0.0 | 0.0
Assets | 143.1 | 136.5
Liabilities |  |
Derivatives | 0.0 | 0.0
Deferred compensation plans | 69.7 | 64.1
Contingent consideration liabilities | 0.0 |
Liabilities | 69.7 | 64.1
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1 | Bank time deposits |  |
Assets |  |
Available-for-sale investments | 0.0 | 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1 | Corporate debt securities |  |
Assets |  |
Available-for-sale investments | 0.0 | 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1 | Asset-backed securities |  |
Assets |  |
Available-for-sale investments | 0.0 | 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1 | U.S. government and agency securities |  |
Assets |  |
Available-for-sale investments | 20.6 | 20.6
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1 | Foreign government bonds |  |
Assets |  |
Available-for-sale investments | 0.0 | 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1 | Commercial paper |  |
Assets |  |
Available-for-sale investments | 0.0 | 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1 | Municipal securities |  |
Assets |  |
Available-for-sale investments | 0.0 | 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 |  |
Assets |  |
Cash equivalents | 111.8 | 22.8
Investments held for deferred compensation plans | 0.0 | 0.0
Derivatives | 19.4 | 4.9
Assets | 688.1 | 690.3
Liabilities |  |
Derivatives | 15.3 | 24.8
Deferred compensation plans | 0.0 | 0.0
Contingent consideration liabilities | 0.0 | 0.0
Liabilities | 15.3 | 24.8
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Bank time deposits |  |
Assets |  |
Available-for-sale investments | 0.5 | 0.5
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Corporate debt securities |  |
Assets |  |
Available-for-sale investments | 386.5 | 445.5
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Asset-backed securities |  |
Assets |  |
Available-for-sale investments | 95.9 | 120.8
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | U.S. government and agency securities |  |
Assets |  |
Available-for-sale investments | 48.0 | 48.1
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Foreign government bonds |  |
Assets |  |
Available-for-sale investments | 3.0 | 3.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Commercial paper |  |
Assets |  |
Available-for-sale investments | 18.6 | 40.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Municipal securities |  |
Assets |  |
Available-for-sale investments | 4.4 | 4.4
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3 |  |
Assets |  |
Cash equivalents | 0.0 | 0.0
Investments held for deferred compensation plans | 0.0 | 0.0
Derivatives | 0.0 | 0.0
Assets | 0.0 | 0.0
Liabilities |  |
Derivatives | 0.0 | 0.0
Deferred compensation plans | 0.0 | 0.0
Contingent consideration liabilities | 199.0 | 244.3
Liabilities | 199.0 | 244.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3 | Bank time deposits |  |
Assets |  |
Available-for-sale investments | 0.0 | 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3 | Corporate debt securities |  |
Assets |  |
Available-for-sale investments | 0.0 | 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3 | Asset-backed securities |  |
Assets |  |
Available-for-sale investments | 0.0 | 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3 | U.S. government and agency securities |  |
Assets |  |
Available-for-sale investments | 0.0 | 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3 | Foreign government bonds |  |
Assets |  |
Available-for-sale investments | 0.0 | 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3 | Commercial paper |  |
Assets |  |
Available-for-sale investments | 0.0 | 0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3 | Municipal securities |  |
Assets |  |
Available-for-sale investments | $ 0.0 | $ 0.0

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