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Business Segment and Geographic Information (Reconciliation of Operating Income) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
May 01, 2019
Mar. 31, 2021
Dec. 31, 2018
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting Information [Line Items]            
Facility closure   $ (23.2) $ (29.0) $ (23.2) $ 0.0 $ (29.0)
Cost reduction actions       0.0 0.0 (25.5)
Gain on exchange with joint venture partner $ 29.1     36.8 0.0 29.1
Company headquarters relocation income (expense)       0.0 33.8 0.0
Operating income       2,281.4 2,237.6 2,144.4
Segment Reconciling Items            
Segment Reporting Information [Line Items]            
Facility closure       (23.2) 0.0 (29.0)
Cost reduction actions       0.0 0.0 (25.5)
Gain on exchange with joint venture partner       36.8 0.0 29.1
Company headquarters relocation income (expense)       0.0 33.8 0.0
Segment Total            
Segment Reporting Information [Line Items]            
Operating income       $ 2,267.8 $ 2,203.8 $ 2,169.8