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Summary of Significant Accounting Policies (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Estimated useful life of Property, Plant, and Equipment |  | Property, Plant, and Equipment Our property, plant, and equipment assets are stated at cost less depreciation. Depreciation is calculated on a straight-line basis over the shorter of the remaining lease term or estimated useful life of the related assets, which are generally as follows:
Buildings |  | 40 years
Building improvements |  | 5-14 years
Machinery and equipment |  | 3-8 years
Computer equipment |  | 3-6 years
Definite lived Intangible Assets Amortization Expense |  | Definite-lived assets are amortized on a straight-line basis generally over the following periods:
Customer lists and relationships |  | 5-15 years
Technology |  | 2-7 years
Accounting Standards Update 2014-09 [Member] |  |
Impact of Adoption of ASC 606 on Revenue | The following table presents the anticipated impacts that the adoption of ASC 606 would have for the periods presented:
|  | Nine Months Ended September 30, 2018 |
|  | As Reported |  |  | Under ASC 606 |  |  | Impact |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |
Recurring services |  | $ | 480.8 |  |  | $ | 460.4 |  |  | $ | (20.4 | )
Professional services and other |  |  | 65.3 |  |  |  | 85.5 |  |  |  | 20.2 |
Total revenue |  | $ | 546.1 |  |  | $ | 545.9 |  |  | $ | (0.2 | )
Operating profit |  | $ | 31.3 |  |  | $ | 36.9 |  |  | $ | 5.6 |
|  | Nine Months Ended September 30, 2017 |
|  | As Reported |  |  | Under ASC 606 |  |  | Impact |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |
Recurring services |  | $ | 438.2 |  |  | $ | 419.8 |  |  | $ | (18.4 | )
Professional services and other |  |  | 50.2 |  |  |  | 72.7 |  |  |  | 22.5 |
Total revenue |  | $ | 488.4 |  |  | $ | 492.5 |  |  | $ | 4.1 |
Operating profit |  | $ | 16.9 |  |  | $ | 25.7 |  |  | $ | 8.8 |

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- Definition Tabular disclosure of prior period adjustments to previously issued financial statements including (1) the effect of the correction on each financial statement line item and any per-share amounts affected for each prior period presented (2) the cumulative effect of the change on retained earnings or other appropriate components of equity or net assets in the statement of financial position, as of the beginning of the earliest period presented, and (3) the effect of the prior period adjustments (both gross and net of applicable income tax) on the net income of each prior period presented in the entity's annual report for the year in which the adjustments are made. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22663-107794 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22644-107794 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22658-107794 + Details
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