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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019, 2018 and 2017: 
 
2019
2018
2017
Numerator:
 
 
 
Net income attributable to The Timken Company
$
362.1

$
302.8

$
203.4

Less: undistributed earnings allocated to nonvested stock
—

—

—

Net income available to common shareholders for basic and diluted earnings per share
$
362.1

$
302.8

$
203.4

Denominator:
 
 
 
Weighted average number of shares outstanding - basic
75,758,123

77,119,602

77,736,398

Effect of dilutive securities:
 
 
 
Stock options and awards - based on the treasury stock method
1,138,442

1,217,879

1,174,751

Weighted average number of shares outstanding, assuming dilution of stock options and awards
76,896,565

78,337,481

78,911,149

Basic earnings per share
$
4.78

$
3.93

$
2.62

Diluted earnings per share
$
4.71

$
3.86

$
2.58