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Business Segment Information (Reconciliation of Equity Affiliates' Income) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Segment Reporting Information [Line Items]        
Tax reform repatriation - equity method investment       $ (32.5)
Equity affiliates' income $ 46.2 $ 43.7 $ 99.1 57.5
Segment Reconciling Items        
Segment Reporting Information [Line Items]        
Tax reform repatriation - equity method investment 0.0 0.0 0.0 (32.5)
Segment Total        
Segment Reporting Information [Line Items]        
Equity affiliates' income $ 46.2 $ 43.7 $ 99.1 $ 90.0