Revenue Recognition (Instrument Rebate Programs) (Details) - Instrument rebate programs - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2018	Jan. 01, 2018
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 60.7	$ 60.7	$ 65.9
Deferred revenue, revenue recognized	$ 4.6	$ 9.2
Deferred revenue, expected recognition within remainder of year, percentage		15.00%
Deferred revenue, expected recognition during year two, percentage		28.00%
Deferred revenue, expected recognition during year three, percentage		22.00%
Deferred revenue, expected recognition thereafter, percentage		35.00%

Deferred Revenue Expected Recognition After Year Three, Percentage

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- Definition

Deferred Revenue, Expected Recognition During Year Three, Percentage

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- Definition

Deferred Revenue, Expected Recognition During Year Two, Percentage

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- Definition

Deferred Revenue, Expected Recognition within Remainder of Year, Percentage

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- Definition

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 13.A.3)
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 13.A.4(a).Q1)
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

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- Definition

Amount of revenue recognized that was previously reported as deferred or unearned revenue.

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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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