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Stockholders' Equity (Narrative) (Detail) shares in Millions, $ in Millions	9 Months Ended	47 Months Ended
	Sep. 30, 2024 USD ($) shares	Sep. 30, 2024 USD ($) shares
Equity [Abstract]
Remaining authorized amount under stock repurchase program	$ 153.5	$ 153.5
Common stock repurchased, shares | shares	1.1	4.6
Purchase of Company, value	$ 60.3	$ 246.5
Maximum
Equity [Abstract]
Stock repurchase program, authorized amount	$ 400.0	$ 400.0

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 30
-Name Accounting Standards Codification
-Section 50
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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.

+ References

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- Definition

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

+ References

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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).

+ References

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