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Earnings per Common Share
 12 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Earnings per Common Share
   Earnings per Common Share
 
The calculations of basic and diluted earnings per common share for the years ended June 30, 2018, 2017 and 2016 were as follows:
 
 
 
Years Ended June 30,
(in millions, except per share data)
 
2018
 
2017
 
2016
Net income
 
$
188.5

 
$
47.0

 
$
11.3

Less: earnings and dividends allocated to participating securities
 
(1.7
)
 
(0.3
)
 
(0.1
)
 
 
 
 
 
 
 
Earnings available for common shareholders used in calculation of basic earnings per share
 
$
186.8

 
$
46.7

 
$
11.2

 
 
 
 
 
 
 
Weighted average number of common shares outstanding, basic
 
47.2

 
47.0

 
48.1

 
 
 
 
 
 
 
Basic earnings per common share
 
$
3.96

 
$
0.99

 
$
0.23

 
 
 
 
 
 
 
Net income
 
$
188.5

 
$
47.0

 
$
11.3

Less: earnings and dividends allocated to participating securities
 
(1.7
)
 
(0.3
)
 
(0.1
)
 
 
 
 
 
 
 
Earnings available for common shareholders used in calculation of diluted earnings per share
 
$
186.8

 
$
46.7

 
$
11.2

 
 
 
 
 
 
 
Weighted average number of common shares outstanding, basic
 
47.2

 
47.0

 
48.1

Effect of shares issuable under share-based compensation plans
 
0.4

 
0.1

 
0.1

 
 
 
 
 
 
 
Weighted average number of common shares outstanding, diluted
 
47.6

 
47.1

 
48.2

 
 
 
 
 
 
 
Diluted earnings per common share
 
$
3.92

 
$
0.99

 
$
0.23


 
The following awards issued under share-based compensation plans were excluded from the calculations of diluted earnings per share above because their effects were anti-dilutive:
 
 
 
Years Ended June 30,
(in millions)
 
2018
 
2017
 
2016
Stock options
 
0.7

 
1.9

 
1.5