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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2017
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 ended March 31, 2017 and 2016, respectively:
 
Three Months Ended
March 31,
 
2017
2016
Numerator:
 
 
Net income attributable to The Timken Company
$
38.2

$
65.9

 Less: undistributed earnings allocated to nonvested stock
—

—

Net income available to common shareholders for basic earnings per share and diluted earnings per share
$
38.2

$
65.9

Denominator:
 
 
Weighted average number of shares outstanding, basic
77,731,793

79,769,761

Effect of dilutive securities:
 
 
Stock options and awards based on the treasury stock method
1,162,161

667,772

 Weighted average number of shares outstanding, assuming dilution of stock options and awards
78,893,954

80,437,533

Basic earnings per share
$
0.49

$
0.83

Diluted earnings per share
$
0.48

$
0.82