Retirement Plans (Details) $ in Millions	12 Months Ended
Dec. 31, 2018 USD ($) Employees	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Retirement Benefits [Abstract]
Noncontributory retirement plans, amounts accrued	$ 4.2	$ 4.0	$ 4.2
Matching contributions made by partnership, net of forfeitures	$ 2.6	2.6	2.4
Multiemployer Plan, Number of Employees \| Employees	240
Multiemployer plan, contributions made in period	$ 1.8	$ 1.8	$ 1.7

Multiemployer Plan, Number of Employees

No definition available.

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- References

No definition available.

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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

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-Subparagraph (e)(1)
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- Definition

Amount of liability for retirement benefits, classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(15))
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- Definition

Amount of cash outflow for pension and other postretirement benefits. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 25
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