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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%

X

- Definition

Represents the employer contribution as a percentage of participating employee's compensation.

+ References

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- Definition

Represents the number of defined contribution retirement plans.

+ References

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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.

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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

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

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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

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