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Earnings Per Share (Tables)
 12 Months Ended
Dec. 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 years ended December 31, 2017, 2016 and 2015: 
 
2017
2016
2015
Numerator:
 
 
 
Net income attributable to The Timken Company
$
203.4

$
140.8

$
188.6

Less: undistributed earnings allocated to nonvested stock
—

—

—

Net income available to common shareholders for basic earnings per share and diluted earnings per share
$
203.4

$
140.8

$
188.6

Denominator:
 
 
 
Weighted-average number of shares outstanding – basic
77,736,398

78,516,029

84,631,778

Effect of dilutive securities:
 
 
 
Stock options and awards - based on the treasury
stock method
1,174,751

718,295

714,468

Weighted-average number of shares outstanding, assuming
dilution of stock options and awards
78,911,149

79,234,324

85,346,246

Basic earnings per share
$
2.62

$
1.79

$
2.23

Diluted earnings per share
$
2.58

$
1.78

$
2.21