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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2018
Segment Reporting [Abstract]  
Summary of segment information
The following table sets forth financial information by business segment (in millions):
 
Net Sales
Operating Income
Operating Income as a % of Net Sales
 
2018

2017

2018

2017

2018

2017

Three Months Ended June 30,
 
 

 
 

 
 

Electrical
$
688.6

$
656.4

$
91.3

$
74.0

13.3
%
11.3
%
Power
478.1

291.9

65.6

60.4

13.7
%
20.7
%
TOTAL
$
1,166.7

$
948.3

$
156.9

$
134.4

13.4
%
14.2
%
Six Months Ended June 30,
 
 

 
 

 
 

Electrical
$
1,306.7

$
1,243.9

$
152.5

$
126.8

11.7
%
10.2
%
Power
851.2

556.7

104.0

115.4

12.2
%
20.7
%
TOTAL
$
2,157.9

$
1,800.6

$
256.5

$
242.2

11.9
%
13.5
%