Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Deficit - Additional Information (Detail)

v3.21.2
Shareholders' Deficit - Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Feb. 09, 2021
Jan. 31, 2021
Aug. 31, 2020
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Feb. 08, 2021
Dec. 31, 2020
Stockholders Equity [Line Items]                    
Share repurchase program authorized amount $ 1,500.0     $ 1,500.0     $ 1,500.0      
Share repurchase program, remaining authorized capacity       1,200.0     1,200.0   $ 7.9  
Share repurchase program expiration date Oct. 30, 2023       Feb. 09, 2024          
Shares repurchases, value       $ 162.7   $ 819.1 $ 909.2 $ 845.1    
Repurchase of common stock, shares             18.2 16.8    
Treasury stock shares, at cost       10.0     10.0     10.0
Repurchase of common stock, shares       3.5   16.8 18.8 17.4    
Repurchase of common stock, value             $ 881.1 $ 817.1    
Repurchase of common stock Per share             $ 48.43 $ 48.55    
Shares repurchases, inclusive of transaction costs             $ 881.1 $ 818.5    
Withheld for tax purpose for share-based compensation plans             28.1 26.6    
Other comprehensive income (loss) before foreign currency translation adjustments reclassifications, tax expense (benefit)             0.9 4.1    
Other comprehensive income (Loss), reclassification adjustment from AOCI on derivatives, net of tax expense (benefit)           $ 0.1   0.1    
Other comprehensive loss before unrealized gain (loss) on derivatives adjustments reclassifications, tax expense (benefit)           $ 0.7 0.6 0.5    
Share repurchases             $ 909.2 844.2    
Payments For Repurchase Of Common Stock Yet To Paid               $ 0.9    
Open Market Repurchase Plan [Member] | Common Stock [Member]                    
Stockholders Equity [Line Items]                    
Treasury stock acquired, average cost per share             $ 49.27 $ 46.44    
Repurchase of common stock, shares             5.7 1.4    
Repurchase of common stock, value             $ 281.1 $ 67.1    
Icahn Parties [Member] | Common Stock [Member]                    
Stockholders Equity [Line Items]                    
Share price   $ 48.05                
Repurchase of common stock, shares   12.5                
Repurchase of common stock, value   $ 600.0                
August Two Thousand And Twenty Dutch Auction Tender Offer [Member]                    
Stockholders Equity [Line Items]                    
Treasury stock acquired, average cost per share     $ 48.75              
Repurchase of common stock, shares     15.4              
Share repurchases     $ 750.0