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FAIR VALUE MEASUREMENTS - Summary of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Available-for-sale investments | $ 935.9 | $ 793.8
Fair Value on a Recurring Basis | Estimate of Fair Value Measurement |  |
Assets |  |
Cash equivalents | 16.2 | 32.4
Investments held for deferred compensation plans | 111.2 | 88.9
Derivatives | 8.1 | 30.7
Total assets | 1,071.3 | 945.8
Liabilities |  |
Derivatives | 39.3 | 6.4
Deferred compensation plans | 111.6 | 88.7
Contingent consideration liabilities | 186.1 | 172.5
Total liabilities | 337.0 | 267.6
Fair Value on a Recurring Basis | Level 1 | Estimate of Fair Value Measurement |  |
Assets |  |
Cash equivalents | 16.2 | 0.7
Investments held for deferred compensation plans | 111.2 | 88.9
Derivatives | 0.0 | 0.0
Total assets | 184.3 | 165.7
Liabilities |  |
Derivatives | 0.0 | 0.0
Deferred compensation plans | 111.6 | 88.7
Contingent consideration liabilities | 0.0 | 0.0
Total liabilities | 111.6 | 88.7
Fair Value on a Recurring Basis | Level 2 | Estimate of Fair Value Measurement |  |
Assets |  |
Cash equivalents | 0.0 | 31.7
Investments held for deferred compensation plans | 0.0 | 0.0
Derivatives | 8.1 | 30.7
Total assets | 887.0 | 780.1
Liabilities |  |
Derivatives | 39.3 | 6.4
Deferred compensation plans | 0.0 | 0.0
Contingent consideration liabilities | 0.0 | 0.0
Total liabilities | 39.3 | 6.4
Fair Value on a Recurring Basis | Level 3 | Estimate of Fair Value Measurement |  |
Assets |  |
Cash equivalents | 0.0 | 0.0
Investments held for deferred compensation plans | 0.0 | 0.0
Derivatives | 0.0 | 0.0
Total assets | 0.0 | 0.0
Liabilities |  |
Derivatives | 0.0 | 0.0
Deferred compensation plans | 0.0 | 0.0
Contingent consideration liabilities | 186.1 | 172.5
Total liabilities | 186.1 | 172.5
Bank time deposits |  |
Assets |  |
Available-for-sale investments | 24.1 | 13.1
Bank time deposits | Fair Value on a Recurring Basis | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments | 24.1 | 13.1
Bank time deposits | Fair Value on a Recurring Basis | Level 1 | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments | 0.0 | 0.0
Bank time deposits | Fair Value on a Recurring Basis | Level 2 | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments | 24.1 | 13.1
Bank time deposits | Fair Value on a Recurring Basis | Level 3 | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments | 0.0 | 0.0
Corporate debt securities |  |
Assets |  |
Available-for-sale investments | 608.3 | 489.2
Corporate debt securities | Fair Value on a Recurring Basis | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments | 608.3 | 489.2
Corporate debt securities | Fair Value on a Recurring Basis | Level 1 | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments | 0.0 | 0.0
Corporate debt securities | Fair Value on a Recurring Basis | Level 2 | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments | 608.3 | 489.2
Corporate debt securities | Fair Value on a Recurring Basis | Level 3 | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments | 0.0 | 0.0
Asset-backed securities |  |
Assets |  |
Available-for-sale investments | 151.5 | 141.7
Asset-backed securities | Fair Value on a Recurring Basis | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments | 151.5 | 141.7
Asset-backed securities | Fair Value on a Recurring Basis | Level 1 | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments | 0.0 | 0.0
Asset-backed securities | Fair Value on a Recurring Basis | Level 2 | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments | 151.5 | 141.7
Asset-backed securities | Fair Value on a Recurring Basis | Level 3 | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments | 0.0 | 0.0
U.S. government and agency securities |  |
Assets |  |
Available-for-sale investments | 149.2 | 113.8
U.S. government and agency securities | Fair Value on a Recurring Basis | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments | 149.1 | 113.8
U.S. government and agency securities | Fair Value on a Recurring Basis | Level 1 | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments | 56.9 | 76.1
U.S. government and agency securities | Fair Value on a Recurring Basis | Level 2 | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments | 92.2 | 37.7
U.S. government and agency securities | Fair Value on a Recurring Basis | Level 3 | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments | 0.0 | 0.0
Municipal securities |  |
Assets |  |
Available-for-sale investments | 2.8 | 0.0
Municipal securities | Fair Value on a Recurring Basis | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments | 2.8 |
Municipal securities | Fair Value on a Recurring Basis | Level 1 | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments | 0.0 |
Municipal securities | Fair Value on a Recurring Basis | Level 2 | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments | 2.8 |
Municipal securities | Fair Value on a Recurring Basis | Level 3 | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments | 0.0 |
Foreign government bonds |  |
Assets |  |
Available-for-sale investments | 0.0 | 1.7
Foreign government bonds | Fair Value on a Recurring Basis | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments |  | 1.7
Foreign government bonds | Fair Value on a Recurring Basis | Level 1 | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments |  | 0.0
Foreign government bonds | Fair Value on a Recurring Basis | Level 2 | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments |  | 1.7
Foreign government bonds | Fair Value on a Recurring Basis | Level 3 | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments |  | 0.0
Commercial paper |  |
Assets |  |
Available-for-sale investments | $ 0.0 | 34.3
Commercial paper | Fair Value on a Recurring Basis | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments |  | 34.3
Commercial paper | Fair Value on a Recurring Basis | Level 1 | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments |  | 0.0
Commercial paper | Fair Value on a Recurring Basis | Level 2 | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments |  | 34.3
Commercial paper | Fair Value on a Recurring Basis | Level 3 | Estimate of Fair Value Measurement |  |
Assets |  |
Available-for-sale investments |  | $ 0.0

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