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EARNINGS PER COMMON SHARE (Tables)
 12 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Information to Calculate Basic and Diluted Earnings (Loss) Per Common Share
The following table presents information necessary to calculate basic and diluted income per Common Share.
 Year Ended September 30,
 202120202019
Income from continuing operations$517.3 $386.9 $436.7 
Net (income) loss attributable to noncontrolling interest(0.9)(1.2)0.5 
Income attributable to controlling interest from continuing operations516.4 385.7 437.2 
Income (loss) from discontinued operations, net of tax(3.9)1.7 23.5 
Net income attributable to controlling interest$512.5 $387.4 $460.7 
Basic Income (Loss) Per Common Share:
Weighted-average Common Shares outstanding
during the period		55.7 55.7 55.5 
Income from continuing operations$9.27 $6.92 $7.88 
Income (loss) from discontinued operations(0.07)0.04 0.42 
Basic net income per Common Share$9.20 $6.96 $8.30 
Diluted Income (Loss) Per Common Share:
Weighted-average Common Shares outstanding
during the period		55.7 55.7 55.5 
Dilutive potential Common Shares1.5 1.2 0.8 
Weighted-average number of Common Shares outstanding and dilutive potential Common Shares57.2 56.9 56.3 
Income from continuing operations$9.03 $6.78 $7.77 
Income (loss) from discontinued operations(0.07)0.03 0.41 
Diluted net income per Common Share$8.96 $6.81 $8.18