Share-based Compensation - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of authorized common stock shares under LTIP (in shares)	51,500,000
Number of shares under LTIP, available for issuance of restricted common shares, performance share units and stock options	13,000,000.0
Unearned compensation expense, before income taxes due 2021	$ 49.0
Unearned compensation expense, before income taxes due 2022	26.0
Unearned compensation expense, before income taxes due 2023	$ 4.0
Outstanding stock options (in shares)	4,382,000	4,301,000
Number of stock options, exercisable (in shares)	3,200,000
Weighted average remaining contractual term - Outstanding	5 years 1 month 6 days	4 years 9 months 18 days
Weighted average remaining contractual life for options, exercisable	3 years 9 months 18 days
Aggregated intrinsic value	$ 9.3
Aggregated intrinsic value for exercisable options	$ 6.3
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
PSU awards, fair value assumption method used	Monte Carlo simulation
Performance period	3 years
Minimum PSU awards payout	0.00%
Maximum PSU awards payout	200.00%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Contractual term of stock options	10 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years

Pre-tax unrecognized employee service share based compensation expected to recognize in year three.

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Pre-tax unrecognized employee service share based compensation expected to recognize in year two.

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Pre-tax unrecognized employee service share based compensation expected to recognize next fiscal year.

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Maximum award payout percentage.

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Minimum award payout percentage.

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Share-based Compensation Arrangement by Share-based Payment Award, Award Performance Period

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Description of method used to estimate fair value of award under share-based payment arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares authorized for issuance under share-based payment arrangement.

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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.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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