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Business Acquisitions (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 02, 2016 | Nov. 30, 2015 | Apr. 02, 2017 | Dec. 31, 2018 | Oct. 28, 2018 | Dec. 31, 2017
Acquisition |  |  |  |  |  |
Estimated useful lives |  |  |  | 12 years 1 month 6 days |  |
Goodwill resulted through acquisition |  |  |  | $ 544.8 | $ 544.3 | $ 550.5
Redeemable financial instrument |  |  |  |  |  |
Acquisition |  |  |  |  |  |
Liability recorded at acquisition date fair value |  |  |  | $ 2.8 |  | $ 2.9
Customer relationships |  |  |  |  |  |
Acquisition |  |  |  |  |  |
Estimated useful lives |  |  |  | 11 years |  |
Technology |  |  |  |  |  |
Acquisition |  |  |  |  |  |
Estimated useful lives |  |  |  | 7 years 2 months 12 days |  |
Trade name |  |  |  |  |  |
Acquisition |  |  |  |  |  |
Estimated useful lives |  |  |  | 13 years 8 months 12 days |  |
PVI Riverside Holdings, Inc Member |  |  |  |  |  |
Acquisition |  |  |  |  |  |
Outstanding shares acquired (as a percent) | 100.00% |  |  |  |  |
Purchase price | $ 79.1 |  |  |  |  |
Goodwill resulted through acquisition | 41.1 |  |  |  |  |
Purchase price allocated to intangible assets | 31.0 |  |  |  |  |
Goodwill deductible for tax purposes | $ 6.9 |  |  |  |  |
PVI Riverside Holdings, Inc Member | Customer relationships |  |  |  |  |  |
Acquisition |  |  |  |  |  |
Estimated useful lives | 15 years |  |  |  |  |
Purchase price allocated to intangible assets | $ 17.6 |  |  |  |  |
PVI Riverside Holdings, Inc Member | Technology |  |  |  |  |  |
Acquisition |  |  |  |  |  |
Estimated useful lives | 10 years |  |  |  |  |
Purchase price allocated to intangible assets | $ 10.2 |  |  |  |  |
PVI Riverside Holdings, Inc Member | Trade name |  |  |  |  |  |
Acquisition |  |  |  |  |  |
Estimated useful lives | 20 years |  |  |  |  |
Purchase price allocated to intangible assets | $ 3.2 |  |  |  |  |
Apex |  |  |  |  |  |
Acquisition |  |  |  |  |  |
Outstanding shares acquired (as a percent) |  | 80.00% | 10.00% |  |  |
Purchase price |  | $ 20.4 | $ 2.9 |  |  |
Aggregate ownership percentage |  |  |  | 90.00% |  |
Shares remaining to be acquired (as a percent) |  | 20.00% |  | 10.00% |  |
Apex | Redeemable financial instrument |  |  |  |  |  |
Acquisition |  |  |  |  |  |
Liability recorded at acquisition date fair value |  | $ 5.5 |  |  |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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