CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings	$ 141.7	$ 152.3	$ 255.2		$ 300.0
Other Comprehensive Earnings, Net of Tax
Foreign currency translation adjustments	35.5	(31.4)	(0.5)		(59.1)
Net benefit plan adjustments			3.4	[1]
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	(2.2)	(3.3)	(4.5)		(6.5)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax	(15.8)	0	(16.4)		0
Other comprehensive earnings (loss) before tax	21.9	(28.1)	(12.4)		(52.6)
Provision for income tax related to items of comprehensive earnings	8.9	(11.0)	(4.7)		(19.9)
Other comprehensive earnings (loss), net of tax	13.0	(17.1)	(7.7)		(32.7)
Comprehensive earnings	154.7	135.2	247.5		267.3
Less: Net earnings attributable to the noncontrolling interest	(0.4)	(0.4)	(0.8)		(0.8)
Comprehensive earnings attributable to Laboratory Corporation of America Holdings	$ 154.3	$ 134.8	$ 246.7		$ 266.5

[1] The amortization of prior service cost is included in the computation of net periodic benefit cost. See Note 9 (Pension and Post-retirement Plans) below for additional information regarding the Company's net periodic benefit cost.