FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Estimate of Fair Value Measurement - Fair Value on a Recurring Basis - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015 |
Assets | | |
Cash equivalents | $ 27.7 | $ 12 |
Investments held for deferred compensation plans | 39.1 | 35.3 |
Derivatives | 14.9 | 23.3 |
Total assets | 472.2 | 433.3 |
Liabilities | | |
Derivatives | 33.3 | 4.2 |
Deferred compensation plans | 39.3 | 35.5 |
Contingent consideration obligation | 31.1 | 30.5 |
Total liabilities | 103.7 | 70.2 |
Corporate debt securities | | |
Assets | | |
Available-for-sale investments | 247.1 | 228.7 |
Asset-backed securities | | |
Assets | | |
Available-for-sale investments | 54.3 | 62.6 |
U.S. government and agency securities | | |
Assets | | |
Available-for-sale investments | 53.2 | 38.5 |
Commercial paper | | |
Assets | | |
Available-for-sale investments | 31 | 28.1 |
Municipal securities | | |
Assets | | |
Available-for-sale investments | 4.7 | 4.7 |
Equity investments in unconsolidated affiliates | | |
Assets | | |
Available-for-sale investments | 0.2 | 0.1 |
Level 1 | | |
Assets | | |
Cash equivalents | 14.8 | 3.5 |
Investments held for deferred compensation plans | 39.1 | 35.3 |
Derivatives | 0 | 0 |
Total assets | 82.1 | 48.5 |
Liabilities | | |
Derivatives | 0 | 0 |
Deferred compensation plans | 39.3 | 35.5 |
Contingent consideration obligation | 0 | 0 |
Total liabilities | 39.3 | 35.5 |
Level 1 | Corporate debt securities | | |
Assets | | |
Available-for-sale investments | 0 | 0 |
Level 1 | Asset-backed securities | | |
Assets | | |
Available-for-sale investments | 0 | 0 |
Level 1 | U.S. government and agency securities | | |
Assets | | |
Available-for-sale investments | 28 | 9.6 |
Level 1 | Commercial paper | | |
Assets | | |
Available-for-sale investments | 0 | 0 |
Level 1 | Municipal securities | | |
Assets | | |
Available-for-sale investments | 0 | 0 |
Level 1 | Equity investments in unconsolidated affiliates | | |
Assets | | |
Available-for-sale investments | 0.2 | 0.1 |
Level 2 | | |
Assets | | |
Cash equivalents | 12.9 | 8.5 |
Investments held for deferred compensation plans | 0 | 0 |
Derivatives | 14.9 | 23.3 |
Total assets | 390.1 | 384.8 |
Liabilities | | |
Derivatives | 33.3 | 4.2 |
Deferred compensation plans | 0 | 0 |
Contingent consideration obligation | 0 | 0 |
Total liabilities | 33.3 | 4.2 |
Level 2 | Corporate debt securities | | |
Assets | | |
Available-for-sale investments | 247.1 | 228.7 |
Level 2 | Asset-backed securities | | |
Assets | | |
Available-for-sale investments | 54.3 | 62.6 |
Level 2 | U.S. government and agency securities | | |
Assets | | |
Available-for-sale investments | 25.2 | 28.9 |
Level 2 | Commercial paper | | |
Assets | | |
Available-for-sale investments | 31 | 28.1 |
Level 2 | Municipal securities | | |
Assets | | |
Available-for-sale investments | 4.7 | 4.7 |
Level 2 | Equity investments in unconsolidated affiliates | | |
Assets | | |
Available-for-sale investments | 0 | 0 |
Level 3 | | |
Assets | | |
Cash equivalents | 0 | 0 |
Investments held for deferred compensation plans | 0 | 0 |
Derivatives | 0 | 0 |
Total assets | 0 | 0 |
Liabilities | | |
Derivatives | 0 | 0 |
Deferred compensation plans | 0 | 0 |
Contingent consideration obligation | 31.1 | 30.5 |
Total liabilities | 31.1 | 30.5 |
Level 3 | Corporate debt securities | | |
Assets | | |
Available-for-sale investments | 0 | 0 |
Level 3 | Asset-backed securities | | |
Assets | | |
Available-for-sale investments | 0 | 0 |
Level 3 | U.S. government and agency securities | | |
Assets | | |
Available-for-sale investments | 0 | 0 |
Level 3 | Commercial paper | | |
Assets | | |
Available-for-sale investments | 0 | 0 |
Level 3 | Municipal securities | | |
Assets | | |
Available-for-sale investments | 0 | 0 |
Level 3 | Equity investments in unconsolidated affiliates | | |
Assets | | |
Available-for-sale investments | $ 0 | $ 0 |