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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 14, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options exercise prices as percentage of the market value on the date of the grant | 100.00% |  |  |
Total intrinsic value of stock options exercised | $ 3.3 | $ 7.7 | $ 12.6 |
Total aggregate intrinsic value of stock options | 19.3 |  |  |
Total aggregate intrinsic value of stock option exercisable | $ 13.3 |  |  |
Grant date fair value of stock options granted | $ 7.56 | $ 8.69 | $ 15.07 |
Compensation expenses for stock options | $ 2.7 | $ 4.7 | $ 4.6 |
Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options vesting period | 3 years |  |  |
Stock options term, years | 10 years |  |  |
Unrecognized compensation expense related to stock | $ 2.5 |  |  |
Weighted-average recognition period for unrecognized compensation expense related to stock (years) | 2 years 2 months 12 days |  |  |
Restricted Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation expense related to stock | $ 53.7 |  |  |
Weighted-average recognition period for unrecognized compensation expense related to stock (years) | 1 year 3 months 18 days |  |  |
Compensation expense | $ 58.6 | 69.1 | 54.3 |
Total fair value of shares, vested | $ 49.8 | 58.8 | 54.4 |
Omnibus Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock based compensation, common stock available for grant | 7,800,000 |  |  |
Omnibus Plan [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock based compensation, common stock available for grant |  |  |  | 19,000,000.0
LTIP [Member] | Restricted Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Eligible age of officer for restricted stock award | 55 years |  |  |
AIP [Member] | Restricted Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Eligible age of officer for restricted stock award | 55 years |  |  |
Additional common stock units for election of deferred annual incentive award, percentage | 25.00% |  |  |
AIP and LTIP [Member] | Restricted Stock Awards and Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation expense related to stock | $ 1.2 |  |  |
Weighted-average recognition period for unrecognized compensation expense related to stock (years) | 1 year 6 months |  |  |
Total fair value of shares, vested | $ 13.5 | 17.3 | 14.7 |
Compensation expense | $ 12.5 | $ 16.6 | $ 14.6 |
Inactive Plans [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares reserved for future issuance | 700,000 |  |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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