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LEASES - Schedule of Effect of Adoption (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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New Accounting Pronouncements or Change in Accounting Principle |  |
Prepaid expenses | $ 88.1 | $ 100.0
Other assets, net | 304.2 | 162.4
Total assets | 7,909.0 | 7,153.2
Other current liabilities | 784.1 | 204.0
Other long-term liabilities | 180.6 | 84.6
Total liabilities | 5,286.1 | $ 3,997.5
Previous Accounting Guidance |  |
New Accounting Pronouncements or Change in Accounting Principle |  |
Prepaid expenses | 90.0 |
Other assets, net | 201.7 |
Total assets | 7,808.4 |
Other current liabilities | 763.7 |
Other long-term liabilities | 100.4 |
Total liabilities | 5,185.5 |
Accounting Standards Update 2016-02 |  |
New Accounting Pronouncements or Change in Accounting Principle |  |
Prepaid expenses | $ (1.9) |
Prepaid expenses (as a percent) | (2.00%) |
Other assets, net | $ 102.5 |
Other assets, net (as a percent) | 51.00% |
Total assets | $ 100.6 |
Total assets (as a percent) | 1.00% |
Other current liabilities | $ 20.4 |
Other current liabilities (as a percent) | 3.00% |
Other long-term liabilities | $ 80.2 |
Other long-term liabilities (as a percent) | 80.00% |
Total liabilities | $ 100.6 |
Total liabilities (as a percent) | 2.00% |

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