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Basis of Presentation and Accounting Policies (Tables)
 6 Months Ended
Mar. 31, 2018
Accounting Policies [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table reconciles basic and diluted earnings (loss) per share (EPS) amounts (in millions, except per share amounts):
 
Three Months Ended
March 31,
 
Six Months Ended
March 31,
 
2018
 
2017
 
2018
 
2017
Net income (loss)
$
227.4

 
$
189.5

 
$
(9.0
)
 
$
404.2

Less: Allocation to participating securities
(0.2
)
 
(0.2
)
 
—

 
(0.4
)
Net income (loss) available to common shareowners
$
227.2

 
$
189.3


$
(9.0
)
 
$
403.8

Basic weighted average outstanding shares
126.9

 
128.7

 
127.6

 
128.5

Effect of dilutive securities
 
 
 
 
 
 
 
Stock options
1.4

 
1.3

 
—

 
1.3

Performance shares
0.2

 
0.3

 
—

 
0.2

Diluted weighted average outstanding shares
128.5

 
130.3

 
127.6

 
130.0

Earnings (loss) per share:
 
 
 
 
 
 
 
Basic
$
1.79

 
$
1.47

 
$
(0.07
)
 
$
3.14

Diluted
$
1.77

 
$
1.45

 
$
(0.07
)
 
$
3.11