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Business Segment Information (Reconciliation of Operating Income) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information [Line Items]        
Business separation costs $ 0.0 $ (9.5) $ (30.2) $ (28.9)
Cost reduction and asset actions (42.7) (13.2) (103.0) (23.9)
Pension settlement loss (5.5) (1.0) (9.6) (3.0)
Goodwill and intangible asset impairment charge (162.1) 0.0 (162.1) 0.0
Operating Income 252.6 394.6 971.9 1,138.7
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Operating Income 462.9 418.3 1,276.8 1,194.5
Segment Reconciling Items [Member]        
Segment Reporting Information [Line Items]        
Business separation costs 0.0 (9.5) (30.2) (28.9)
Cost reduction and asset actions (42.7) (13.2) (103.0) (23.9)
Pension settlement loss (5.5) (1.0) (9.6) (3.0)
Goodwill and intangible asset impairment charge $ (162.1) $ 0.0 $ (162.1) $ 0.0