Commitments and Contingencies Environmental Matter (Details) $ in Millions	9 Months Ended
	Oct. 31, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Estimated Remediation Costs CPG Preferred Approach Low Estimate	$ 483.0
Identified Remediation Plan, Cost Estimated by the EPA	1,380.0
RoD Design Phase, Settlement Amount by Third Party	$ 165.0