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Goodwill and Identifiable Assets - Summary of Identifiable Intangible Assets with Definite and Indefinite Useful Lives (Details) (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 129.3 | $ 113.2
Accumulated Amortization | (93.4) | (82.0)
Net | 35.9 | 31.2
Total identifiable intangible assets |  |
Gross Carrying Value | 138.2 | 122.1
Net | 44.8 | 40.1
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 | 31.9 | 25.0
Accumulated Amortization | (19.0) | (17.5)
Net | 12.9 | 7.5
Trademarks and tradenames with indefinite lives |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 0.7 | 0.6
Accumulated Amortization | (0.3) | (0.2)
Net | 0.4 | 0.4
Capitalized software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 48.7 | 42.6
Accumulated Amortization | (37.8) | (31.2)
Net | 10.9 | 11.4
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 37.4 | 34.4
Accumulated Amortization | (26.7) | (24.2)
Net | 10.7 | 10.2
Contracts |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 10.6 | 10.6
Accumulated Amortization | (9.6) | (8.9)
Net | $ 1.0 | $ 1.7

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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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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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