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Employee Retirement Benefits - Contributions to Multiemployer Plans (Details) $ in Millions | 12 Months Ended
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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

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- Definition Multiemployer Plans, Number of Plans + References No definition available. + Details
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Period Type: | duration

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- 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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- 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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