CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net restructuring and other special charges	$ 7,100,000	$ 14,200,000
Provision for income taxes	243,400,000	66,400,000	$ 358,000,000.0	$ 214,400,000
Net earnings	703,700,000	221,000,000.0	618,400,000	597,600,000
Other Comprehensive Earnings, Net of Tax
Foreign currency translation adjustments	132,900,000	(92,600,000)	52,400,000	(45,400,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	2,100,000	3,200,000	7,500,000	8,700,000
Other comprehensive earnings (loss) before tax	135,000,000.0	(89,400,000)	59,900,000	(36,700,000)
Tax effect of adjustments	(600,000)	(900,000)	(2,100,000)	(2,400,000)
Other comprehensive earnings (loss), net of tax	134,400,000	(90,300,000)	57,800,000	(39,100,000)
Comprehensive earnings	838,100,000	130,700,000	676,200,000	558,500,000
Less: Net earnings attributable to the noncontrolling interest	(300,000)	(300,000)	(600,000)	(900,000)
Comprehensive earnings attributable to Laboratory Corporation of America Holdings	$ 837,800,000	$ 130,400,000	$ 675,600,000	$ 557,600,000