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Earnings per Common Share (Tables)
 3 Months Ended
Sep. 30, 2019
Earnings Per Share [Abstract]  
Schedule of calculations of basic and diluted earnings per common share

The calculations of basic and diluted earnings per common share for the three months ended September 30, 2019 and 2018 were as follows: 
 
 
Three Months Ended
September 30,
(in millions, except per share data)
 
2019
 
2018
Net income
 
$
41.2

 
$
31.5

Less: earnings and dividends allocated to participating securities
 
(0.4
)
 
(0.3
)
Earnings available for common stockholders used in calculation of basic earnings per common share
 
$
40.8

 
$
31.2

 
 
 
 
 
Weighted average number of common shares outstanding, basic
 
47.9

 
47.6

 
 
 
 
 
Basic earnings per common share
 
$
0.85

 
$
0.66

 
 
 
 
 
Net income
 
$
41.2

 
$
31.5

Less: earnings and dividends allocated to participating securities
 
(0.4
)
 
(0.3
)
Earnings available for common stockholders used in calculation of diluted earnings per common share
 
$
40.8

 
$
31.2

 
 
 
 
 
Weighted average number of common shares outstanding, basic
 
47.9

 
47.6

Effect of shares issuable under share-based compensation plans
 
0.4

 
0.6

Weighted average number of common shares outstanding, diluted
 
48.3

 
48.2

 
 
 
 
 
Diluted earnings per common share
 
$
0.85

 
$
0.65
Schedule of awards issued under share-based compensation plans excluded from the calculations of diluted earnings per share
The following awards issued under share-based compensation plans were excluded from the above calculations of diluted earnings per share because their effects were anti-dilutive:
 
 
 
Three Months Ended
September 30,
(in millions)
 
2019
 
2018
Stock options
 
0.8

 
0.1