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Employee Retirement Benefits - Contributions to Multiemployer Plans (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) plan	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Multiemployer Plans [Line Items]
Number of other multiemployer plans | plan	6
Multiemployer Plans, Pension
Multiemployer Plans [Line Items]
Contributions	$ 1.7	$ 1.5	$ 1.4
Multiemployer Plans, Pension | Midwest Operating Engineers
Multiemployer Plans [Line Items]
Contributions	0.8	0.7	0.7
Multiemployer Plans, Pension | Other Plans
Multiemployer Plans [Line Items]
Contributions	$ 0.9	$ 0.8	$ 0.7

X

- Definition

Multiemployer Plans, Number of Plans

+ References

No definition available.

+ Details

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X

- 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

No definition available.

+ Details

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X

- Definition

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

+ Details

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- Details

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- Details

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- Details

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