Other Postretirement Benefits - Other Information (Details) - Other Postretirement Benefit Plans [Member] - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 25, 2016
Other Postretirement Benefits
Postemployment benefits liability	$ 11.3	$ 11.4
Increase (decrease) in postretirement benefit obligation due to changes in mortality assumptions	$ (0.6)	(1.2)
Decrease in service costs and interest costs		$ 1.0
Minimum [Member]
Other Postretirement Benefits
Spot rate used in calculation of service and interest costs		1.32%
Maximum [Member]
Other Postretirement Benefits
Spot rate used in calculation of service and interest costs		4.79%

Other Postretirement Benefits, Increase (Decrease) in Net Periodic Benefit Cost

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- Definition

Other Postretirement Benefits, Spot Rate Used in Calculation of Service and Interest Costs

+ References

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- Definition

Postretirement Benefit Obligation Increase (Decrease) due to Changes in Mortality Assumptions

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

The carrying amount as of the balance sheet date of the obligations recognized for the various benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 712
-SubTopic 10
-Section 25
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6410138&loc=d3e79691-111665

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 712
-SubTopic 10
-Section 25
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6410138&loc=d3e79708-111665

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.15)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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