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Basis of Presentation (Narrative) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Sep. 30, 2018 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |
Deferred commission | $ 20.7 | $ 25.4 | $ 25.4
Amortization of deferred sales commissions |  | 6.4 | 17.7
Remaining performance obligation |  | $ 2,817.4 | $ 2,817.4
Remaining performance obligation expected to be recognized over next twelve months, percent |  | 60.00% | 60.00%
Software-As-A-Service |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Required payment, number of days |  |  | 30 days
Software Licenses | Minimum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Required payment, number of days |  |  | 30 days
Software Licenses | Maximum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Required payment, number of days |  |  | 60 days
PCS | Minimum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Required payment, number of days |  |  | 30 days
PCS | Maximum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Required payment, number of days |  |  | 60 days
Engineered Products | Minimum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Required payment, number of days |  |  | 30 days
Engineered Products | Maximum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Required payment, number of days |  |  | 60 days
Accounting Standards Update 2014-09 |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Cumulative effect on retained earnings | $ 14.3 |  |

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- Definition The amount of expense recognized in the current period for the periodic realization of capitalized fees that were paid to salespeople, distributors, brokers, and agents at the time of the conclusion of the sale. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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