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Employee Benefit Plans - 401K Contribution and Supplemental Compensation agreement (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Employee Benefit Plans |  |  |
Base contribution as a percentage of employee gross pay (as a percent) | 2.00% |  |
Employer maximum match of an employee's contributions of first 4% of eligible compensation (as a percent) | 100.00% |  |
Percentage of eligible compensation, matched 100% by employer | 4.00% |  |
Company's matching contributions under certain 401(k) savings plans | $ 6.1 | $ 5.0 | $ 5.4
Foreign pension plans |  |  |
Employee Benefit Plans |  |  |
Charges for pension plans | $ 3.9 | $ 4.1 | $ 4.5

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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 net periodic benefit cost (credit) for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + 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 of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Represents the base contribution as a percentage of employee gross pay which the employer may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition Represents the employer maximum matching contribution of the first level of an employee's contributions. + References No definition available. + Details
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- Details
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