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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2013
Earnings Per Share [Abstract]  
Reconciliation of the numerator and the denominator of basic earnings per share and diluted earnings per share
The following table sets forth the reconciliation of the numerator and the denominator of basic earnings per share and diluted earnings per share for the three months and six months ended June 30, 2013 and 2012:
  
Three Months Ended
June 30,
Six Months Ended
June 30,
  
2013
2012
2013
2012
Numerator:
 
 
 
 
Net income attributable to The Timken Company
$
82.8

$
183.6

$
157.9

$
339.3

Less: undistributed earnings allocated to nonvested stock
0.1

0.6

0.2

1.2

Net income available to common shareholders for basic
  earnings per share and diluted earnings per share
$
82.7

$
183.0

$
157.7

$
338.1

Denominator:
 
 
 
 
Weighted average number of shares outstanding, basic
95,695,015

97,265,627

95,732,984

97,355,740

Effect of dilutive securities:
 
 
 
 
Stock options and awards based on the treasury
   stock method
854,106

938,578

914,570

1,017,617

   Weighted average number of shares outstanding, 
       assuming dilution of stock options and awards
96,549,121

98,204,205

96,647,554

98,373,357

Basic earnings per share
$
0.86

$
1.88

$
1.64

$
3.47

Diluted earnings per share
$
0.86

$
1.86

$
1.63

$
3.44