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Goodwill and Identifiable Intangible Assets, net - Summary of Identifiable Intangible Assets, net (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 196.0 | $ 172.0
Accumulated Amortization | (102.6) | (97.3)
Net | 93.4 | 74.7
Total identifiable intangible assets, net |  |
Gross Carrying Value | 204.9 | 180.9
Net | 102.3 | 83.6
Trademarks and tradenames with indefinite lives |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Trademarks and tradenames with indefinite lives | 8.9 | 8.9
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 71.1 | 59.7
Accumulated Amortization | (21.5) | (19.7)
Net | 49.6 | 40.0
Trademarks and tradenames with indefinite lives |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 13.3 | 11.6
Accumulated Amortization | (1.1) | (0.5)
Net | 12.2 | 11.1
Capitalized software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 60.6 | 50.6
Accumulated Amortization | (46.9) | (40.0)
Net | 13.7 | 10.6
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 37.4 | 39.2
Accumulated Amortization | (23.1) | (27.5)
Net | 14.3 | 11.7
Contracts |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 13.6 | 10.9
Accumulated Amortization | (10.0) | (9.6)
Net | $ 3.6 | $ 1.3

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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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