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THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES - Impairment of assets (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 29, 2017
Jun. 30, 2017
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES            
Impairment of long-lived assets     $ 13.8 $ 84.3 $ 13.8 $ 43.6
Investment expense (income) $ 3.5 $ 204.5   3.6    
Total losses       $ 87.9 $ 13.8 $ 43.6