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Earnings Per Share (Tables)
 6 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Basic and Diluted Earnings Per Share
The components of basic and diluted earnings per share were as follows:

  
Three months ended
September 30,
  
Six months ended
September 30,
 
  
2018
  
2017
  
2018
  
2017
 
Net earnings attributable to Modine
 
$
38.5
  
$
15.9
  
$
60.5
  
$
32.9
 
Less: Undistributed earnings attributable to unvested shares
  
(0.1
)
  
(0.1
)
  
(0.2
)
  
(0.3
)
Net earnings available to Modine shareholders
 
$
38.4
  
$
15.8
  
$
60.3
  
$
32.6
 
                 
Weighted-average shares outstanding - basic
  
50.5
   
49.8
   
50.4
   
49.6
 
Effect of dilutive securities
  
0.9
   
0.9
   
0.9
   
0.8
 
Weighted-average shares outstanding - diluted
  
51.4
   
50.7
   
51.3
   
50.4
 
                 
Earnings per share:
                
Net earnings per share - basic
 
$
0.76
  
$
0.32
  
$
1.19
  
$
0.66
 
Net earnings per share - diluted
 
$
0.75
  
$
0.31
  
$
1.18
  
$
0.65