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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Assets and Liabilities Associated with Interest Rate Derivatives (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Assets:    
Other current assets $ 0.0 $ 1.9
Other long-term assets 10.8 0.3
Total assets 10.8 2.3
Liabilities:    
Accrued expenses and other current liabilities 2.1 4.2
Other long-term liabilities 23.0 40.6
Total liabilities $ 25.1 $ 44.8