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Goodwill and Identifiable Assets - Summary of Identifiable Intangible Assets with Definite and Indefinite Useful Lives (Detail) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
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Finite And Infinite Lived Intangible Assets [Line Items] |  |
Intangible assets with definite life, Gross Carrying Value | $ 116.2 | $ 113.2
Intangible assets with definite life, Accumulated Amortization | (85.8) | (82.0)
Intangible assets with definite life, Net | 30.4 | 31.2
Gross Carrying Value | 125.1 | 122.1
Net | 39.3 | 40.1
Trademarks and tradenames with indefinite lives [Member] |  |
Finite And Infinite Lived Intangible Assets [Line Items] |  |
Intangible assets with definite life, Accumulated Amortization | 0.0 |
Intangible assets with indefinite life, Gross Carrying Value | 8.9 | 8.9
Intangible assets with indefinite life, Net | 8.9 | 8.9
Customer relationships [Member] |  |
Finite And Infinite Lived Intangible Assets [Line Items] |  |
Intangible assets with definite life, Gross Carrying Value | 25.2 | 25.0
Intangible assets with definite life, Accumulated Amortization | (18.0) | (17.5)
Intangible assets with definite life, Net | 7.2 | 7.5
Trademarks and tradenames [Member] |  |
Finite And Infinite Lived Intangible Assets [Line Items] |  |
Intangible assets with definite life, Gross Carrying Value | 0.6 | 0.6
Intangible assets with definite life, Accumulated Amortization | (0.2) | (0.2)
Intangible assets with definite life, Net | 0.4 | 0.4
Capitalized Software [Member] |  |
Finite And Infinite Lived Intangible Assets [Line Items] |  |
Intangible assets with definite life, Gross Carrying Value | 45.3 | 42.6
Intangible assets with definite life, Accumulated Amortization | (33.3) | (31.2)
Intangible assets with definite life, Net | 12.0 | 11.4
Technology [Member] |  |
Finite And Infinite Lived Intangible Assets [Line Items] |  |
Intangible assets with definite life, Gross Carrying Value | 34.6 | 34.4
Intangible assets with definite life, Accumulated Amortization | (24.9) | (24.2)
Intangible assets with definite life, Net | 9.7 | 10.2
Customer Contracts [Member] |  |
Finite And Infinite Lived Intangible Assets [Line Items] |  |
Intangible assets with definite life, Gross Carrying Value | 10.5 | 10.6
Intangible assets with definite life, Accumulated Amortization | (9.4) | (8.9)
Intangible assets with definite life, Net | $ 1.1 | $ 1.7

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- Definition Accumulated amount of 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 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 Amount after 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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