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Stockholders' Equity (Narrative) (Detail) - USD ($)
shares in Millions, $ in Millions
9 Months Ended 59 Months Ended
Sep. 30, 2025
Sep. 30, 2025
Jul. 31, 2025
Equity [Abstract]      
Common stock repurchased, shares 2.1 6.8  
Purchase of Company, value $ 122.3 $ 377.0  
Maximum      
Equity [Abstract]      
Stock repurchase program, authorized amount     $ 300.0