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Summary of Significant Accounting Policies - Summary of Intangible Assets (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 568.2 | $ 373.5
Accumulated Amortization | (124.1) | (86.4)
Net Carrying Value | $ 444.1 | $ 287.1
Weighted Average Useful Life (years) | 11 years 6 months | 7 years 6 months
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 22.2 | $ 24.6
Accumulated Amortization | (9.3) | (16.4)
Net Carrying Value | $ 12.9 | $ 8.2
Weighted Average Useful Life (years) | 8 years 7 months 6 days | 8 years 7 months 6 days
Customer-based |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 544.6 | $ 338.2
Accumulated Amortization | (113.9) | (68.3)
Net Carrying Value | $ 430.7 | $ 269.9
Weighted Average Useful Life (years) | 11 years 7 months 6 days | 7 years 4 months 24 days
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 1.4 | $ 10.7
Accumulated Amortization | (0.9) | (1.7)
Net Carrying Value | $ 0.5 | $ 9.0
Weighted Average Useful Life (years) | 5 years 2 months 12 days | 5 years 9 months 18 days

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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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