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Earnings per Common Share (Tables)
 9 Months Ended
Mar. 31, 2017
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 and nine months ended March 31, 2017 and 2016 were as follows: 
 
 
Three Months Ended
March 31,
 
Nine Months Ended
March 31,
(in millions, except per share data)
 
2017
 
2016
 
2017
 
2016
Net income (loss)
 
$
20.7

 
$
(23.9
)
 
$
21.5

 
$
(3.6
)
Less: earnings and dividends allocated to participating securities
 
(0.1
)
 
—

 
(0.2
)
 
—

Earnings (loss) available for common stockholders used in calculation of basic earnings per common share
 
$
20.6

 
$
(23.9
)
 
$
21.3

 
$
(3.6
)
 
 
 
 
 
 
 
 
 
Weighted average number of common shares outstanding, basic
 
47.0

 
47.1

 
47.0

 
48.5

 
 
 
 
 
 
 
 
 
Basic earnings (loss) per common share
 
$
0.44

 
$
(0.51
)
 
$
0.45

 
$
(0.08
)
 
 
 
 
 
 
 
 
 
Net income (loss)
 
$
20.7

 
$
(23.9
)
 
$
21.5

 
$
(3.6
)
Less: earnings and dividends allocated to participating securities
 
(0.1
)
 
—

 
(0.2
)
 
—

Earnings (loss) available for common stockholders used in calculation of diluted earnings per common share
 
$
20.6

 
$
(23.9
)
 
$
21.3

 
$
(3.6
)
 
 
 
 
 
 
 
 
 
Weighted average number of common shares outstanding, basic
 
47.0

 
47.1

 
47.0

 
48.5

Effect of shares issuable under share-based compensation plans
 
0.1

 
—

 
0.1

 
—

Weighted average number of common shares outstanding, diluted
 
47.1

 
47.1

 
47.1

 
48.5

 
 
 
 
 
 
 
 
 
Diluted earnings (loss) per common share
 
$
0.44

 
$
(0.51
)
 
$
0.45

 
$
(0.08
)
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
March 31,
 
Nine Months Ended
March 31,
(in millions)
 
2017
 
2016
 
2017
 
2016
Stock options
 
2.0

 
1.6

 
1.9

 
1.6