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Earnings per share (Tables)
 6 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted The following table sets forth the computation of basic and diluted earnings per share for the quarter and six months ended March 31, 2019 and 2018:
(in millions, except per share data)
For the Quarter Ended March 31,
 
For the Six Months Ended March 31,
Basic earnings per share
2019
 
2018
 
2019
 
2018
Net (loss)/earnings from continuing operations
$
(62.3
)
 
$
7.8

 
$
8.5

 
$
68.2

Mandatory preferred stock dividends
(3.3
)
 
—

 
(3.3
)
 
—

Net (loss)/earnings from continuing operations attributable to common shareholders
(65.6
)

7.8


5.2


68.2

Net loss from discontinued operations, net of tax
(11.0
)
 
—

 
(11.0
)
 
—

Net (loss)/earnings attributable to common shareholders
$
(76.6
)

$
7.8


$
(5.8
)

$
68.2

 
 
 
 
 
 
 
 
Weighted average common shares outstanding - basic
67.3

 
59.7

 
63.5

 
60.0

 
 
 
 
 
 
 
 
Basic net (loss)/earnings per common share from continuing operations
$
(0.97
)
 
$
0.13

 
$
0.08

 
$
1.14

Basic net loss per common share from discontinued operations
(0.17
)
 
—

 
(0.17
)
 
—

Basic net (loss)/earnings per common share
$
(1.14
)
 
$
0.13

 
$
(0.09
)
 
$
1.14

 
 
 
 
 
 
 
 
Diluted earnings per share
 
 
 
 
 
 
 
Net (loss)/earnings attributable to common shareholders
$
(76.6
)
 
$
7.8

 
$
(5.8
)
 
$
68.2

 
 
 
 
 
 
 
 
Weighted average common shares outstanding - basic
67.3

 
59.7

 
63.5

 
60.0

Dilutive effect of restricted stock equivalents
—

 
1.4

 
0.3

 
1.3

Dilutive effect of performance shares
—

 
—

 
0.6

 
—

Dilutive effect of stock based deferred compensation plan
—

 
—

 
0.2

 
—

Weighted average common shares outstanding - diluted
67.3

 
61.1

 
64.6

 
61.3

 
 
 
 
 
 
 
 
Diluted net (loss)/earnings per common share - continuing operations
$
(0.97
)
 
$
0.13

 
$
0.08

 
$
1.11

Diluted net loss per common share - discontinued operations
(0.17
)
 
—

 
(0.17
)
 
—

Diluted net (loss)/earnings per common share
$
(1.14
)
 
$
0.13

 
$
(0.09
)
 
$
1.11