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LEASES - Effect of Adoption on Key Financial Statements (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Prepaid expenses | $ 107.0 |
Other assets, net | 304.3 |
Total assets | 7,335.7 | $ 7,153.2
Other current liabilities | 892.8 | 204.0
Other long-term liabilities | 178.8 | 84.6
Total liabilities | 4,724.8 | $ 3,997.5
Accounting Standards Update 2016-02 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Prepaid expenses | $ (1.6) |
Prepaid expenses (as a percent) | (1.00%) |
Other assets, net | $ 119.1 |
Other assets, net (as a percent) | 64.00% |
Total assets | $ 117.5 |
Total assets (as a percent) | 2.00% |
Other current liabilities | $ 20.9 |
Other current liabilities (as a percent) | 2.00% |
Other long-term liabilities | $ 96.6 |
Other long-term liabilities (as a percent) | 118.00% |
Total liabilities | $ 117.5 |
Total liabilities (as a percent) | 3.00% |
Previous Accounting Guidance |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Prepaid expenses | $ 108.6 |
Other assets, net | 185.2 |
Total assets | 7,218.2 |
Other current liabilities | 871.9 |
Other long-term liabilities | 82.2 |
Total liabilities | $ 4,607.3 |

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