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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2018
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 and nine months ended September 30, 2018 and 2017, respectively:
 
Three Months Ended
September 30,
Nine Months Ended
September 30,
 
2018
2017
2018
2017
Numerator:
 
 
 
 
Net income attributable to The Timken Company
$
71.6

$
53.5

$
242.8

$
174.2

 Less: undistributed earnings allocated to nonvested stock
—

—

—

—

Net income available to common shareholders for
basic and diluted earnings per share
$
71.6

$
53.5

$
242.8

$
174.2

Denominator:
 
 
 
 
Weighted average number of shares outstanding - basic
76,903,395

77,694,974

77,332,209

77,766,828

Effect of dilutive securities:
 
 
 
 
Stock options and awards - based on the treasury stock method
1,524,710

1,109,322

1,313,294

1,123,102

 Weighted average number of shares outstanding, assuming
  dilution of stock options and awards
78,428,105

78,804,296

78,645,503

78,889,930

Basic earnings per share
$
0.93

$
0.69

$
3.14

$
2.24

Diluted earnings per share
$
0.91

$
0.68

$
3.09

$
2.21