Share-Based Compensation Expenses (Detail) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2024 |
Mar. 31, 2023 |
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| Share-Based Payment Arrangement [Abstract] | ||
| Option awards | $ 5.3 | $ 5.8 |
| Other share-based awards | 5.0 | 6.2 |
| Total share-based compensation before tax | 10.3 | 12.0 |
| Tax benefit | 2.5 | 2.8 |
| Total share-based compensation expense included in net income | $ 7.8 | $ 9.2 |
| X | ||||||||||
- Definition Restricted Stock Or Unit Expense, Net Of Performance Value Adjustment No definition available.
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount, after tax, of expense for award under share-based payment arrangement. No definition available.
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| X | ||||||||||
- References No definition available.
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- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of noncash expense for option under share-based payment arrangement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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