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Employee Benefit Plans (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items]          
Company contributions to pension and defined benefit plans, including discretionary amounts $ 1.0 $ 1.0 $ 2.8 $ 2.3  
HRG Pension Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Termination date, defined benefit plan     Feb. 15, 2018    
Unfunded benefit obligation 4.5   $ 4.5   $ 4.2
Accrual estimated additional cost to settle defined benefit plan $ 1.6   $ 1.6