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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]          
CARES Act $ 76,200,000 $ 55,900,000      
Goodwill, Impairment Loss     $ 422,400,000 $ 0  
Accounts receivable from Ontario government sponsored healthcare plan     600,000 3,200,000  
Inventory Valuation Reserves     20,200,000 0.0  
Accounts receivable balances (gross) from Medicare and Medicaid     $ 109,800,000 81,400,000  
Ownership percentage below which investments are generally accounted for on the cost method (in hundredths)     20.00%    
Cash, Uninsured Amount     $ 1,319,400,000 $ 335,000,000.0  
Minimum threshold percentage required to recognize income tax benefit (in hundredths)     50.00%    
Percent of gross accounts receivable due from patients     13.90% 21.10%  
Inventory, Finished Goods, Gross     $ 19,600,000 $ 16,400,000  
Other Inventory, Supplies, Gross     403,600,000 228,300,000  
Goodwill and Intangible Asset Impairment     462,100,000 $ 0 $ 0
Equity Method Investment, Other than Temporary Impairment     $ 25,400,000