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Retirement Plans (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) plan | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer matching contribution percent | 7.00% | 7.00% |
Domestic Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of defined contribution retirement plans | plan | 6 |  |
Entity's contribution to retirement plans as percentage of employees' compensation | 3.00% |  |
Cost of defined contribution plans | $ | $ 14.2 | $ 10.1 | $ 9.5
Foreign Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of defined contribution retirement plans | plan | 4 |  |
Switzerland | Foreign Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributions to pension funds | $ | $ 4.0 | $ 3.1 | $ 2.5
Minimum | Foreign Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Entity's contribution to retirement plans as percentage of employees' compensation | 3.00% |  |
Maximum | Foreign Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Entity's contribution to retirement plans as percentage of employees' compensation | 15.00% |  |

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- Definition Represents the number of defined contribution retirement plans. + 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 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 Amount of payment for pension benefits. Excludes other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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