Commitments and Contingencies (Pace) (Narrative) (Details) - Pace, Florida [Member] - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Mar. 31, 2016	Sep. 30, 2006
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	$ 30.5	$ 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
Loss Contingencies [Line Items]
Pretax environmental expense		$ 42.0