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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, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 554.9 | $ 568.2
Accumulated Amortization | (169.2) | (124.1)
Net Carrying Value | $ 385.7 | $ 444.1
Weighted Average Useful Life (years) | 11 years 6 months | 11 years 6 months
Gross Carrying Value | $ 565.7 |
Accumulated Amortization | (169.2) | $ (124.1)
Net Carrying Value | 396.5 |
In-process research and development |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Gross and Net Carrying Value | 10.8 |
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 20.1 | 22.2
Accumulated Amortization | (11.8) | (9.3)
Net Carrying Value | $ 8.3 | $ 12.9
Weighted Average Useful Life (years) | 8 years 6 months | 8 years 7 months 6 days
Accumulated Amortization | $ (11.8) | $ (9.3)
Customer-based |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 533.4 | 544.6
Accumulated Amortization | (156.3) | (113.9)
Net Carrying Value | $ 377.1 | $ 430.7
Weighted Average Useful Life (years) | 11 years 7 months 6 days | 11 years 7 months 6 days
Accumulated Amortization | $ (156.3) | $ (113.9)
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 1.4 | 1.4
Accumulated Amortization | (1.1) | (0.9)
Net Carrying Value | $ 0.3 | $ 0.5
Weighted Average Useful Life (years) | 2 years 6 months | 5 years 2 months 12 days
Accumulated Amortization | $ (1.1) | $ (0.9)

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