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Additional Consolidated Income Statement and Cash Flow Information - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Interest and other investment income | $ 2.7 | $ 4.6 | $ 2.0
Income taxes paid | 210.4 | 221.6 | 195.2
Cash paid for interest | $ 86.2 | $ 84.9 | $ 83.6

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