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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accounting Policies [Abstract]      
Goodwill, Impairment Loss $ 260,000,000.0 $ 0  
Accounts receivable from Ontario government sponsored healthcare plan   7,200,000  
Inventory Valuation Reserves 23,300,000 40,100,000  
Accounts receivable balances (gross) from Medicare and Medicaid $ 85,800,000 94,500,000  
Ownership percentage below which investments are generally accounted for on the cost method (in hundredths) 20.00%    
Cash, Uninsured Amount $ 428,100,000 $ 1,471,000,000  
Minimum threshold percentage required to recognize income tax benefit (in hundredths) 50.00%    
Percent of gross accounts receivable due from patients 15.30% 16.70%  
Inventory, Finished Goods, Gross $ 57,800,000 $ 29,900,000  
Other Inventory, Supplies, Gross 412,800,000 371,500,000  
Goodwill and Intangible Asset Impairment 271,500,000 0 $ 462,100,000
Goodwill $ 8,121,000,000 $ 7,958,900,000 $ 7,751,500,000
Earnings Per Share
Earnings per Share
Basic earnings per share is computed by dividing net earnings attributable to Laboratory Corporation of America Holdings by the weighted average number of common shares outstanding. Diluted earnings per share is computed by dividing net earnings including the impact of dilutive adjustments by the weighted average number of common shares outstanding plus potentially dilutive shares, as if they had been issued at the earlier of the date of issuance or the beginning of the period presented. Potentially dilutive common shares result primarily from the Company’s outstanding stock options, restricted stock awards, performance share awards, and accelerated share repurchases.
The following represents a reconciliation of basic earnings per share to diluted earnings per share: 
 202220212020
IncomeSharesPer Share
Amount		IncomeSharesPer Share
Amount		IncomeSharesPer Share
Amount
Basic earnings per share$1,279.1 91.1 $14.05 $2,377.3 96.7 $24.60 $1,556.1 97.3 $15.99 
Stock options and stock awards— 0.5  — 0.8  — 0.7  
Diluted earnings per share$1,279.1 91.6 $13.97 $2,377.3 97.5 $24.39 $1,556.1 98.0 $15.88 
The following table summarizes the potential common shares not included in the computation of diluted earnings per share because their impact would have been antidilutive:
 Years Ended December 31,
 202220212020
Stock options0.20.10.2
    
Stock Options (in shares) 0.2 0.1 0.2
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Increase (Decrease) in Deferred Liabilities $ (18,300,000) $ 75,900,000 $ 47,000,000.0