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Litigation and Contingencies Environmental Remediation (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 30, 2017
Environmental Remediation Obligations [Abstract]
Environmental remediation costs	$ 0.9	$ 31.1
Environmental remediation accrual	26.0
Environmental remediation accrual, current	11.9
Environmental remediation accrual, noncurrent	$ 14.1

X

- Definition

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

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Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.

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