Commitments and Contingencies Environmental Matter (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Apr. 30, 2015
EPA's FFS remediation approaches [Member] \| Minimum [Member]
Environmental Matter Disclosure [Line Items]
Estimated Remediation Costs Low Estimate	$ 360.0
EPA's FFS remediation approaches [Member] \| Maximum [Member]
Environmental Matter Disclosure [Line Items]
Estimated Remediation Costs High Estimate	3,250.0
EPA-recommended remediation approach [Member] \| Minimum [Member]
Environmental Matter Disclosure [Line Items]
Estimated Remediation Costs EPA Preferred Method Low Estimate	950.0
EPA-recommended remediation approach [Member] \| Maximum [Member]
Environmental Matter Disclosure [Line Items]
Estimated Remediation Costs EPA Preferred Method High Estimate	1,731.0
CPG Preferred Approach [Member] \| Minimum [Member]
Environmental Matter Disclosure [Line Items]
Estimated Remediation Costs CPG Recommended Approach	$ 483.0

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Low end of the range of estimated remediation costs associated with the remediation of the lower eight miles of the Passaic River as recommended by the CPG based on the Feasibility Study portion of the RI/FS.

+ References

No definition available.

+ Details

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- Definition

High end of the range of total anticipated costs associated with remediation of the lower eight miles of the Passaic River based on the EPA preferred method of remediation described in the EPA’s Focused Feasibility Study.

+ References

No definition available.

+ Details

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- Definition

Low end of the range of total anticipated costs associated with remediation of the lower eight miles of the Passaic River based on the EPA preferred method of remediation described in the EPA’s Focused Feasibility Study.

+ References

No definition available.

+ Details

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- Definition

High end of the range of total anticipated costs associated with remediation of the lower eight miles of the Passaic River as described in the EPA’s Focused Feasibility Study.

+ References

No definition available.

+ Details

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- Definition

Low end of the range of total anticipated costs associated with remediation of the lower eight miles of the Passaic River as described in the EPA’s Focused Feasibility Study.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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