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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 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 June 30, 2017 and 2016, respectively:
 
Three Months Ended
June 30,
Six Months Ended
June 30,
 
2017
2016
2017
2016
Numerator:
 
 
 
 
Net income attributable to The Timken Company
$
82.5

$
48.2

$
120.7

$
114.1

 Less: undistributed earnings allocated to nonvested stock
—

—

—

—

Net income available to common shareholders for basic earnings per share and diluted earnings per share
$
82.5

$
48.2

$
120.7

$
114.1

Denominator:
 
 
 
 
Weighted average number of shares outstanding, basic
77,931,576

78,671,509

77,814,438

79,225,703

Effect of dilutive securities:
 
 
 
 
Stock options and awards based on the treasury stock method
1,097,821

641,265

1,129,991

654,519

 Weighted average number of shares outstanding, assuming dilution
 of stock options and awards
79,029,397

79,312,774

78,944,429

79,880,222

Basic earnings per share
$
1.06

$
0.61

$
1.55

$
1.44

Diluted earnings per share
$
1.04

$
0.61

$
1.53

$
1.43