Commitments and Contingencies (Pace) (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Mar. 31, 2013	Sep. 30, 2006
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies, Maximum payout period, years	30 years
Pace, Florida [Member]
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	$ 33.6	$ 42.0
Years to complete environmental remediation		20 years
Change in estimated exposure	0
Environmental loss contingencies estimated costs through completion, maximum		52
Environmental loss contingencies estimated costs through completion, minimum		42
Segment Discontinued Operations Member | Pace, Florida [Member]
Loss Contingencies [Line Items]
Pretax environmental expense		$ 42.0