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Revenues, Significant Changes in Deferred Revenue (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2018 USD ($)
Significant Changes in Deferred Revenue [Roll Forward] |  |
Balance at beginning of period (upon adoption of ASC 606) | $ 224.7 |
Deferred revenue included in opening balance transferred to other accounts during period | (54.0) | [1]
Deferred revenue recorded during period | 86.0 |
Deferred revenue recorded during period transferred to other accounts | (37.6) | [1]
Deferred revenue recorded in connection with business combination | 0.0 |
Balance at end of period | $ 219.1 |
[1] | Unbilled revenues are transferred to accounts receivable once we have an unconditional right to consideration from the customer. Deferred revenues are recognized as revenue upon satisfaction of our performance obligation to the customer.

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130532-203044 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 + Details
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