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Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Holiday [Line Items] |  |  |  |  |  |  |  |  |
Federal statutory tax rate |  |  |  |  |  | 35.00% | 35.00% | 35.00% |
Provisional income tax expense |  |  |  |  |  | $ 317.8 | $ 0.0 | $ 0.0 |
Repatriation toll charge payable period |  |  |  |  |  | 8 years |  |  |
Provisional estimate of income tax expense related to the 2017 Tax Act |  | $ 317.8 | $ 0.0 | $ 0.0 | $ 0.0 | $ 47.6 |  |  |
Excess tax benefits associated with employee equity plans |  | 19.9 | $ 19.7 | $ 30.6 | $ 32.6 | $ 102.8 | 0.0 | 0.0 |
Excess tax benefits related to share-based compensation arrangements, percent reduction |  |  |  |  |  | 9.40% |  |  |
Income Tax Holiday, Termination Period |  |  |  |  |  | 5 years |  |  |
Valuation allowance |  | 29.4 |  |  |  | $ 29.4 | 17.2 |  |
Unrecognized tax benefits, period increase (decrease) |  |  |  |  |  | 40.6 |  |  |
Total gross unrecognized tax benefits |  | 65.4 |  |  |  | 65.4 | 106.0 | 92.4 | $ 75.5
Interest and penalties related to unrecognized tax benefits accrued |  | $ 1.8 |  |  |  | 1.8 | $ 3.7 | $ 2.9 |
Swiss Federal Tax Administration (FTA) |  |  |  |  |  |  |  |  |
Income Tax Holiday [Line Items] |  |  |  |  |  |  |  |  |
Tax benefit from tax holiday |  |  |  |  |  | $ 10.9 |  |  |
Tax benefit from tax holiday (in dollars per share) |  |  |  |  |  | $ 0.09 |  |  |
Scenario, forecast |  |  |  |  |  |  |  |  |
Income Tax Holiday [Line Items] |  |  |  |  |  |  |  |  |
Federal statutory tax rate | 21.00% |  |  |  |  |  |  |  |
Pro forma |  |  |  |  |  |  |  |  |
Income Tax Holiday [Line Items] |  |  |  |  |  |  |  |  |
Estimated cumulative undistributed foreign earnings |  |  |  |  |  | $ 1,873.8 |  |  |
Provisional estimate of income tax expense related to repatriation toll |  |  |  |  |  | $ 270.2 |  |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32059-109318 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to repatriation of foreign earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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