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Stockholders' Equity (Narrative) (Detail) shares in Millions, $ in Millions	9 Months Ended	13 Months Ended
	Sep. 30, 2023 USD ($) shares	Sep. 30, 2023 USD ($) shares
Equity [Abstract]
Remaining authorized amount under stock repurchase program	$ 231.5	$ 231.5
Common stock repurchased, shares | shares	1.0	3.2
Purchase of Company, value	$ 55.0	$ 168.5
Maximum
Equity [Abstract]
Stock repurchase program, authorized amount	$ 400.0	$ 400.0

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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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
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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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