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Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 193.8 | $ 196.5
Accumulated Amortization | (167.8) | (165.0)
Net Carrying Amount | 26.0 | 31.5
Patents and developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 156.0 | 158.7
Accumulated Amortization | (140.2) | (141.6)
Net Carrying Amount | 15.8 | 17.1
Distribution rights and others |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 9.2 | 9.2
Accumulated Amortization | (9.2) | (9.1)
Net Carrying Amount | 0.0 | 0.1
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 28.6 | 28.6
Accumulated Amortization | (18.4) | (14.3)
Net Carrying Amount | $ 10.2 | $ 14.3

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