Stockholders' Equity (Narrative) (Detail) shares in Thousands, $ in Millions	6 Months Ended	44 Months Ended
Jun. 30, 2024 USD ($) shares	Jun. 30, 2024 USD ($) shares
Equity [Abstract]
Remaining authorized amount under stock repurchase program	$ 169.6	$ 169.6
Common stock repurchased, shares \| shares	811	4,300
Purchase of Company, value	$ 44.2	$ 230.4
Maximum
Equity [Abstract]
Stock repurchase program, authorized amount	$ 400.0	$ 400.0

Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481520/505-30-50-4

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Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

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Number of shares that have been repurchased and retired during the period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
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-Section S99
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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