Commitments and Contingencies (Pace) (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2006
Loss Contingencies [Line Items]
Pretax environmental expense	$ 27.0	$ 28.3	$ 35.1
Pace, Florida [Member]
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	$ 30.1			$ 42.0
Years to complete environmental remediation	20 years beginning in 2006
Change in estimated exposure	$ 0.0
Environmental loss contingencies estimated costs through completion, maximum	52.0
Environmental loss contingencies estimated costs through completion, minimum	$ 42.0
Segment Discontinued Operations Member | Pace, Florida [Member]
Loss Contingencies [Line Items]
Pretax environmental expense				$ 42.0