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BUSINESS SEGMENT INFORMATION Business Segment information (Notes)
 6 Months Ended
Jun. 30, 2018
Segment Reporting Information [Line Items]  
Segment Reporting Disclosure [Text Block]
BUSINESS SEGMENT INFORMATION
The following table is a summary of segment information for the three and six months ended June 30, 2018 and 2017. The management approach has been used to present the following segment information. This approach is based upon the way the management of the Company organizes its business unit operations for making operating decisions and assessing performance. Financial information is reported on the basis that it is used internally by the chief operating decision maker (CODM) for evaluating segment performance and deciding how to allocate resources to segments. The Company’s chief executive officer has been identified as the CODM.
Segment asset information is not presented because it is not used by the CODM at the segment level. Operating earnings of each segment represents net revenues less directly identifiable expenses to arrive at operating income for the segment. General management and administrative corporate expenses are included in general corporate expenses below. The table below represents information about the Company’s reporting segments for the three and six months ended June 30, 2018 and 2017:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2018
 
2017
 
2018
 
2017
Revenues:
LCD
$
1,814.0

 
$
1,721.1

 
$
3,584.2

 
$
3,360.8

CDD
1,054.2

 
807.5

 
2,132.6

 
1,581.7

Intercompany eliminations
(1.9
)
 
(0.4
)
 
(2.2
)
 
(0.6
)
Revenues
2,866.3

 
2,528.2

 
5,714.6

 
4,941.9

 
 
 
 
 
 
 
 
Operating earnings:
LCD
336.3

 
334.5

 
639.8

 
644.0

CDD
68.8

 
29.6

 
107.3

 
71.1

Unallocated corporate expenses
(35.9
)
 
(34.3
)
 
(72.5
)
 
(67.2
)
Total operating income
369.2

 
329.8

 
674.6

 
647.9

Other income (expense), net
(56.5
)
 
(50.6
)
 
(120.4
)
 
(103.5
)
Earnings before income taxes
312.7

 
279.2

 
554.2

 
544.4

Provision for income taxes
78.6

 
94.1

 
147.6

 
176.0

Net earnings
234.1

 
185.1

 
406.6

 
368.4

Less (earnings) loss attributable to noncontrolling interests
(0.3
)
 
(0.3
)
 
0.4

 
(0.6
)
Net income attributable to Laboratory Corporation of America Holdings
$
233.8

 
$
184.8

 
$
407.0

 
$
367.8