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Long-Term Incentive Employee Compensation Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 04, 2020 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share available for future grant under stock option | 37,200,000 |  |  |  |
Share-based compensation, vesting period | 3 years |  |  |  |
Contractual period | 10 years |  |  |  |
Intrinsic value of options exercised | $ 4.1 | $ 11.1 | $ 4.5 |  |
Cash received from the exercise of stock options | 4.3 | 14.9 | 5.8 |  |
Share-based Payment Arrangement, Exercise of Option, Tax Benefit | 4.1 | 6.5 | 3.0 |  |
Excess Tax benefit from stock activity | $ 3.0 | $ 4.6 | $ 2.2 |  |
Options Outstanding Number | 200,000 | 300,000 | 700,000 |  | 900,000
Share Price | $ 77.02 |  |  | $ 61.17 |
Equity Based Awards [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost related to unvested options and restricted stock | $ 16.8 |  |  |  |
Unrecognized compensation cost weighted average amortization period (years) | 1 year 9 months 18 days |  |  |  |
Liability Based Awards [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost related to unvested options and restricted stock | $ 1.3 |  |  |  |
Unrecognized compensation cost weighted average amortization period (years) | 2 years |  |  |  |
Equity-settled PSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total number of shares expected to vest | 400,000 |  |  |  |
TSR Plan Awards [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Dividend yield | 1.11% |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend | $ 0.676 |  |  |  |
Share Price |  |  |  | 61.17 |
ROIC Award [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Dividend yield | 1.11% |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend | $ 0.676 |  |  |  |
Share Price |  |  |  | $ 61.17 |
Out of the Money Options [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options Outstanding Number | 0 |  |  |  |

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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