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Employee Benefit Plans (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Employee Benefit Plans [Abstract]        
Company contributions to pension and defined benefit plans, including discretionary amounts $ 0.5 $ 2.0 $ 0.9 $ 3.1