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Benefit Plans and Other Postretirement Benefits, Defined contribution plans (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Benefit Plans and Other Postretirement Benefits |  |
Contributions to U.S. defined contribution plans by the Company, maximum percentage of eligible compensation | 5.00% |
Matching contributions to U.S. defined contribution plans by the Company | $ 4.3 | $ 3.2

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- References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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