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Balance Sheet Details - Property and Equipment (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Property, Plant and Equipment [Line Items] |  |  |  |
Property and equipment | $ 200.4 | $ 262.9 | $ 200.4 |
Less accumulated depreciation and amortization | (54.8) | (79.8) | (54.8) |
Total property and equipment, net | 145.6 | 183.1 | 145.6 |
Loss on disposal of machinery and equipment |  | 5.4 |  |
Depreciation | 16.1 | 28.6 |  | $ 14.4
Building |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and equipment | 6.0 | 6.0 | 6.0 |
Furniture and fixtures |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and equipment | 5.7 | 9.0 | 5.7 |
Computer software and hardware |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and equipment | 25.6 | 29.2 | 25.6 |
Machinery and equipment |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and equipment | 33.8 | 80.7 | 33.8 |
Leasehold improvements |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and equipment | 41.7 | 80.7 | 41.7 |
Less accumulated depreciation and amortization |  | (0.7) |  |
Construction in progress |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and equipment | 87.6 | 57.3 | 87.6 |
Disposal of property plant and equipment |  |  | 11.0 |
Leased Buildings -232 South Dobson Road |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Construction in progress | $ 33.6 | $ 6.2 | $ 33.6 |

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- Definition Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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