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Contingencies Contingencies (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Accrual for environmental investigation and remediation activities	$ 5.0
Loss contingency, range of possible loss, minimum	0
Loss contingency, range of possible loss, maximum	$ 2.9

Total costs accrued as of the balance sheet date for environmental loss contingencies.

The estimated maximum amount of possible loss from the contingency.

The estimated minimum amount of possible loss from the contingency.