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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, 2015 | Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 448.0 | $ 246.3
Accumulated Amortization | (191.8) | (153.8)
Net Carrying Value | $ 256.2 | $ 92.5
Weighted Average Useful Life (years) | 8 years 8 months 12 days | 8 years 4 months 24 days
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 31.1 | $ 31.4
Accumulated Amortization | (19.4) | (16.3)
Net Carrying Value | $ 11.7 | $ 15.1
Weighted Average Useful Life (years) | 7 years 8 months 12 days | 9 years
Customer-based |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 406.0 | $ 214.9
Accumulated Amortization | (172.4) | (137.5)
Net Carrying Value | $ 233.6 | $ 77.4
Weighted Average Useful Life (years) | 8 years 9 months 18 days | 8 years 2 months 12 days
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 10.9 |
Accumulated Amortization | 0.0 |
Net Carrying Value | $ 10.9 |
Weighted Average Useful Life (years) | 5 years 8 months 12 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=26713463&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=26713463&loc=d3e16323-109275 + Details
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