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Earnings Per Share (Schedule of Earnings per Share) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share [Abstract]      
Net income from continuing operations $ 2,028.8 $ 1,901.0 $ 1,760.0
Net income (loss) from discontinued operations 70.3 (14.3) 0.0
Net Income Attributable to Air Products $ 2,099.1 $ 1,886.7 $ 1,760.0
Weighted average common shares — Basic 221.6 221.2 220.3
Employee stock option and other award plans 0.9 1.1 1.3
Weighted average common shares — Diluted 222.5 222.3 221.6
Per Share Data      
Basic EPS from continuing operations (in dollars per share) [1] $ 9.16 $ 8.59 $ 7.99
Basic EPS from discontinued operations (in dollars per share) [1] 0.32 (0.06) 0
Basic EPS Attributable to Air Products (in dollars per share) [1] 9.47 8.53 7.99
Diluted EPS from continuing operations (in dollars per share) [1] 9.12 8.55 7.94
Diluted EPS from discontinued operations (in dollars per share) [1] 0.32 (0.06) 0
Diluted EPS Attributable to Air Products (in dollars per share) [1] $ 9.43 $ 8.49 $ 7.94
[1] Earnings per share ("EPS") is calculated independently for each component and may not sum to total EPS due to rounding.