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Income before Provision for Income Taxes, Classified by Source of Income (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Document Fiscal Year Focus | 2020 |  |
U.S. | $ 1,390.4 | $ 2,159.1 | $ 2,218.0
Outside the U.S. | 4,750.3 | 5,859.0 | 5,598.1
Income before provision for income taxes | $ 6,140.7 | $ 8,018.1 | $ 7,816.1

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