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Segment Information - Additional Information (Detail) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) Segment Country | Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |
Number of countries in which the Company sells products | Country | 94 |
Number of reportable segments | Segment | 2 |
Goodwill allocated to the Company's Segment | $ 92.9 | $ 96.9
Cash and cash equivalents | 1,198.9 | 1,278.8
Total amount of cash held by foreign subsidiaries maintained or invested in U.S. dollars | 309.4 | 633.3
Primary Reporting Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Goodwill allocated to the Company's Segment | 89.8 | 93.6
China [Member] |  |
Segment Reporting Information [Line Items] |  |
Goodwill allocated to the Company's Segment | 3.1 | 3.3
Foreign countries [Member] |  |
Segment Reporting Information [Line Items] |  |
Cash and cash equivalents | 870.3 | 1,133.5
United States [Member] |  |
Segment Reporting Information [Line Items] |  |
Cash and cash equivalents | $ 328.6 | $ 145.3

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