Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2020 USD ($) term $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Incentive Plan, common stock available for issuance \| shares	2,700,000
Number of long term incentive plans \| term	2
Incentive Plan, options vesting period	3 years
Unrecognized compensation cost, weighted-average recognition period	1 year 10 months 24 days
Incentive Plan, options maturity period	10 years
Incentive Plan, weighted-average grant date fair value of stock options granted \| $ / shares	$ 15.21	$ 11.36	$ 14.14
Unrecognized compensation cost related to unvested option	$ 6.7
Fair value of options vested	9.4	$ 7.1	$ 6.7
Intrinsic value of stock options exercised	$ 64.0	26.0	8.7
Performance Condition Achievement
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vested \| shares	(60,048)
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation costs classified as liability	$ 2.3	1.4	0.9
Incentive Plan, options vesting period	3 years
Unrecognized pre-tax compensation cost	$ 23.1
Fair value of performance share awards vested	$ 24.0	$ 15.2	$ 22.2
Stock Option Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost, weighted-average recognition period	2 years
Performance Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized pre-tax compensation cost	$ 19.9
Unrecognized compensation cost, weighted-average recognition period	1 year 8 months 12 days
Fair value of performance share awards vested	$ 4.3
Vested \| shares	(60,048)
Director Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock awards issued \| shares	20,181	21,746	19,109
Common stock issued to outside directors \| $ / shares	$ 46.82	$ 54.48	$ 54.93

Number of long term incentive plans.

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Share Based Compensation Arrangement By Share Based Payment Award Stock Based Award Weighted Average Fair Value

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Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements. Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date.

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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.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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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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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).

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