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Contract Balances (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2018
Business Acquisition [Line Items] |  |  |
Contract with customer, revenues recognized | $ 91.8 |  | $ 555.3
Change in net contract liabilities |  | $ 15.6 |
Gatan, Inc. | Held-for-sale |  |  |
Business Acquisition [Line Items] |  |  |
Change in net contract liabilities |  |  | (12.8)
2018 Acquisitions |  |  |
Business Acquisition [Line Items] |  |  |
Change in net contract liabilities |  |  | $ 26.0

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130549-203045 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84173487&loc=SL51747714-108306 + Details
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