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Employee Retirement Plans (Multiemployer Pension Plans) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($) plan	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Multiemployer Plans [Line Items]
Number of underfunded plans | plan	2
Withdrawal obligation	$ 37.0
Payments to multiemployer pension plans	9.4	$ 7.8
Other Long-Term Liabilities
Multiemployer Plans [Line Items]
Withdrawal obligation	33.1		$ 35.7
Other Current Liabilities
Multiemployer Plans [Line Items]
Withdrawal obligation	$ 3.9		$ 8.4

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- Definition

Multiemployer Plans, Number of Underfunded Plans

+ References

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Amount of cost for employer contribution to multiemployer pension plan determined to be individually insignificant.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=35742348&loc=SL14450788-114948

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 5
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

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Amount of the obligation recognized by withdrawing from a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

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