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Multiemployer Plans - Narrative (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) plan	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Multiemployer Plans [Line Items]
Withdrawal liability	$ 0	$ 0	$ 0
Minimum | Multiemployer Plans, Pension
Multiemployer Plans [Line Items]
Number of plans | plan	200
UNITED STATES | Multiemployer Plans, Pension | Multiemployer Plan, Plan Information, Available
Multiemployer Plans [Line Items]
Contribution increase due to acquisition	$ 4,800,000
Contributions	215,478,000	190,229,000	179,216,000
UNITED STATES | Multiemployer Plans, Postretirement Benefit | Multiemployer Plan, Plan Information, Not Available
Multiemployer Plans [Line Items]
Contribution increase due to acquisition	11,000,000.0
Contributions	153,500,000	135,900,000	130,900,000
UNITED STATES | Minimum | Multiemployer Plans, Pension | Multiemployer Plan, Plan Information, Available
Multiemployer Plans [Line Items]
Contributions	2,000,000.0
UK Plan | Multiemployer Plans, Pension | Multiemployer Plan, Plan Information, Not Available
Multiemployer Plans [Line Items]
Contributions	$ 100,000	$ 100,000	$ 100,000
Multiemployer plans, funded status	At least 80 percent
Red Zone | UNITED STATES | Minimum | Multiemployer Plans, Pension | Multiemployer Plan, Plan Information, Available
Multiemployer Plans [Line Items]
Contributions	$ 500,000
Orange or Yellow Zones | UNITED STATES | Minimum | Multiemployer Plans, Pension | Multiemployer Plan, Plan Information, Available
Multiemployer Plans [Line Items]
Contributions	$ 1,000,000.0

X

- Definition

Multiemployer Plans, Contribution Increase (Decrease), Acquisition

+ References

No definition available.

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Multiemployer Plans, Number of Plans

+ References

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- Definition

Amount of contributions made to multiemployer plan by employer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-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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- Definition

Indicate whether the multiemployer plan is less than 65 percent funded, between 65 and less than 80 percent funded, or at least 80 percent funded. The acceptable values are: (1) "less than 65 percent", (2) "between 65 and less than 80 percent", (3) "at least 80 percent", and (4) "NA". A multiemployer plan is 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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

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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.

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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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No definition available.

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