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Employee Retirement Plans (Multiemployer Pension Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Adjustment to MEPPs withdrawal liability	$ 44.6	$ 18.4	$ 31.6
Multiemployer plans, plan contributions	13.1	24.0	11.8
Withdrawal liability	50.9
Other Noncurrent Liabilities
Defined Benefit Plan Disclosure [Line Items]
Withdrawal liability	42.5	19.4
Accrued Liabilities
Defined Benefit Plan Disclosure [Line Items]
Withdrawal liability	$ 8.4	$ 8.8
Graphics Communications International Union Employer Retirement Fund
Defined Benefit Plan Disclosure [Line Items]
Funded percentage of plan (less than)	65.00%
Graphics Communications Conference of the International Brotherhood of Teamsters National PensionFund
Defined Benefit Plan Disclosure [Line Items]
Funded percentage of plan (less than)	65.00%
Adjustment to MEPPs withdrawal liability
Defined Benefit Plan Disclosure [Line Items]
Adjustment to MEPPs withdrawal liability	$ 32.1		$ 11.2

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Multiemployer Defined Benefit Plan, Funded Status of Plan, Percentage Funded Maximum

+ References

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Amount of contributions made to multiemployer plan by all employers who participate in plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 7
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450678-114947

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

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