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Earnings Per Share Earnings Per Share (Tables)
 9 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The calculation of basic and diluted earnings per common share was as follows (in millions, except number of share amounts):
 
Three Months Ended 
 June 30,
 
Nine Months Ended 
 June 30,
 
2015
 
2014
 
2015
 
2014
Net income
$
89.9

 
$
105.1

 
$
179.2

 
$
231.5

Earnings allocated to participating securities
(0.2
)
 
(0.4
)
 
(0.4
)
 
(0.9
)
Earnings available to common shareholders
$
89.7

 
$
104.7

 
$
178.8

 
$
230.6

 
 
 
 
 
 
 
 
Basic Earnings Per Share:
 
 
 
 
 
 
 
Weighted-average common shares outstanding
78,117,876

 
84,635,817
 
78,327,982

 
84,666,189
 
 
 
 
 
 
 
 
Diluted Earnings Per Share:
 
 
 
 
 
 
 
Basic weighted-average common shares outstanding
78,117,876

 
84,635,817

 
78,327,982

 
84,666,189

Dilutive stock options and other equity-based compensation awards
1,185,651

 
1,489,220

 
1,131,081

 
1,509,735

Participating restricted stock
(119,450
)
 
(215,972
)
 
(114,641
)
 
(205,065
)
Diluted weighted-average common shares outstanding
79,184,077

 
85,909,065

 
79,344,422

 
85,970,859
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
Options not included in the computation of diluted earnings per share attributable to common shareholders because they would have been anti-dilutive were as follows:
 
Three Months Ended 
 June 30,
 
Nine Months Ended 
 June 30,
 
2015
 
2014
 
2015
 
2014
Stock options
253,675

 
4,000

 
855,294

 
595,500