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Share-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Apr. 26, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common shares authorized under 2014 Stock Incentive Plan |  | 24,800,000 |  |  |
Common shares remain for future issuance under share-based compensation plans |  | 8,300,000 |  |  |
Realized income tax benefit for all awards |  | $ 7.9 | $ 11.2 | $ 10.4 |
Tax deficiencies on share-based compensation arrangements |  | 6.5 | 5.2 | 0.6 |
Total vesting date fair value of stock units |  | $ 22.6 | 27.2 | 38.0 |
Reserved for issuance under employee stock purchase plan |  | 4,000,000 |  |  |
Future issuance of employee stock purchase plan |  | 2,400,000 |  |  |
Percent of fair market value for which eligible employees can purchase common shares under employee stock purchase plan |  | 85.00% |  |  |
Weighted-average grant date fair value of SARs granted |  | $ 9.41 |  |  |
Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total intrinsic value of awards granted for SARs |  |  | 0.0 | $ 0.0 |
Total intrinsic value of awards exercised for SARs |  | $ 0.0 | $ 0.0 |  |
Performance conditions [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
SARs granted |  | 0 | 0 |  |
Chief Executive Officer [Member] | Performance conditions [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Performance stock unit awards vesting date |  |  |  | Dec. 31, 2024 |
Stock options and SARs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Contractual term |  | 10 years |  |  |
Stock Appreciation Rights (SARs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted-average grant date fair value of SARs granted |  | $ 4.61 | $ 7.83 | $ 6.38 |
SARs granted | [1] | 7,364,000 |  |  |
Stock Appreciation Rights (SARs) | Performance conditions [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Awards granted |  | 0 |  |  |
SARs granted |  |  | 0 | 0 |
Stock Appreciation Rights (SARs) | Service condition [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period beginning from the grant date |  | 2 years | 3 years |  |
Stock Appreciation Rights (SARs) | Stock Incentive Plan Other [Member] | Performance conditions [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period beginning from the grant date |  | 3 years |  |  |
Stock Appreciation Rights (SARs) | Chief Executive Officer [Member] | Service condition [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period beginning from the grant date |  |  |  | 2 years |
Service condition awards [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense (benefit) |  | $ 49.9 | $ 49.5 | $ 44.5 |
Unrecognized compensation cost on non-vested stock awards |  | $ 58.7 |  |  |
Unrecognized compensation cost on non-vested stock awards, weighted-average period of recognition |  | 1 year 7 months 6 days |  |  |
Total intrinsic value of awards exercised for options and SARs |  |  |  | 0.4 |
Service condition awards [Member] | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total intrinsic value of awards exercised for options and SARs |  |  | 0.1 |  |
Performance condition awards [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense (benefit) |  | $ 0.1 | $ (1.5) | (0.1) |
Unrecognized compensation cost on non-vested stock awards |  | $ 0.0 |  |  |
Total intrinsic value of awards exercised for options and SARs |  |  |  | $ 0.1 |
Weighted-average grant date fair value of SARs granted |  | $ 4.41 |  |  |
Performance condition awards [Member] | Independent Director Stock Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period beginning from the grant date |  | 1 year |  |  |
Performance condition awards [Member] | Chief Executive Officer [Member] | Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Performance stock unit awards vesting percentage |  |  |  | 0.00% |
Performance condition awards [Member] | Chief Executive Officer [Member] | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Performance stock unit awards vesting percentage |  |  |  | 200.00% |
Management Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Additional awards |  | 0 |  |  |
2014 Stock Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Additional awards |  | 0 |  |  |
2005 Stock Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Additional awards |  | 0 |  |  |
2023 Stock Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common shares remain for future issuance under share-based compensation plans |  |  |  |  | 24,200,000
Awards granted |  | 0 |  |  |
Stock Incentive Plan [Member] | Performance condition awards [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period beginning from the grant date |  | 3 years |  |  |
Contractual term |  | 3 years |  |  |
[1] | Includes 3.4 million performance condition SARs granted to a consultant.

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