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Summary of Significant Accounting Policies Share-Based Compensation Expense and Effect on Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accounting Policies [Abstract] |  |  |
Share-based compensation expense | $ 109.6 | $ 125.1 | $ 117.5
After tax | $ 94.2 | $ 108.1 | $ 82.0
Earnings per common share-diluted | $ 0.12 | $ 0.14 | $ 0.10

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- Definition The effect of share-based compensation expense on net income per common share-diluted + References No definition available. + Details
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Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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- Definition Amount, after tax, of expense for award under share-based payment arrangement. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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