Annual report pursuant to Section 13 and 15(d)

Shareholders' Deficit - Additional Information (Detail)

v3.22.0.1
Shareholders' Deficit - Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 09, 2021
Dec. 31, 2020
Jan. 31, 2021
Aug. 31, 2020
Feb. 28, 2014
Mar. 31, 2014
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Oct. 31, 2017
Stockholders Equity [Line Items]                    
Repurchase of common stock, shares             20.4 18.4    
Common shares, shares outstanding   120.1         100.8 120.1 137.4  
Preference shares authorized             7.5      
Preference shares par value             $ 0.002      
Share repurchase program authorized amount $ 1.5           $ 1,500.0      
Share repurchase program, remaining authorized capacity $ 7.9           $ 1.1      
Share repurchase program expiration date Oct. 30, 2023           Feb. 09, 2024      
Forward counterparties shares purchased and subsequently retired                 6.0  
Accumulated deficit   $ (687.4)         $ (1,169.0) $ (687.4)    
Repurchase of common stock             $ 48.10      
Repurchase of common stock, shares             21.0 19.0 0.4  
Treasury stock shares, at cost   10.0         10.0 10.0    
Shares repurchases, inclusive of transaction costs and issuance of CVR value             $ 982.7 $ 893.9 $ 0.0  
Withheld for tax purpose for share-based compensation plans             28.6 29.6 16.7  
Repurchase of common stock, value             1,011.3 923.5 16.7  
Share repurchases             1,011.3 923.5 16.7  
Other comprehensive loss before unrealized gain (loss) on derivatives adjustments reclassifications, tax expense (benefit)               0.6    
Other comprehensive income (loss) before foreign currency translation adjustments reclassifications, tax expense (benefit)             0.2 (2.0) $ (0.1)  
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax               $ 0.2    
Capped call transactions [Member]                    
Stockholders Equity [Line Items]                    
Capped call transactions with financial institutions         $ 123.8          
Capped call transactions price per common share         $ 60.39          
Increase (decrease) in additional paid-in capital, other           $ 123.8        
Terminating result of portion of capped call transactions cash received             $ 55.9      
Capped call transactions [Member] | Convertible Senior Notes Due 2019 [Member]                    
Stockholders Equity [Line Items]                    
Convertible notes conversion price         $ 43.14          
Open market purchases [Member] | Common Stock[Member]                    
Stockholders Equity [Line Items]                    
Repurchase of common stock, shares             7.9 3.0    
Treasury stock acquired, average cost per share             $ 48.17 $ 47.40    
Repurchase of common stock, value             $ 382.7 $ 142.1    
Open market purchases [Member] | Indirect wholly owned subsidiary [Member]                    
Stockholders Equity [Line Items]                    
Repurchase of common stock               $ 48.53    
Repurchase of common stock, value               $ 892.1    
Prepaid forward share repurchase transactions [Member]                    
Stockholders Equity [Line Items]                    
Forward share repurchase transactions amount         $ 685.8 685.8        
Forward transactions, shares to be purchased         19.9          
Treasury stock acquired, average cost per share         $ 34.51          
Settlement date of forward transactions                 Aug. 15, 2019  
Forward counterparties shares purchased and subsequently retired   19.9             6.0  
Shares outstanding under forward purchasing transactions   0.0           0.0    
Accumulated deficit           653.9        
Additional paid-in-capital           (31.9)        
Non-cash forward transaction issuance costs           $ 35.8        
Non-cash interest expense relating to amortization of non-cash issuance costs                 $ 1.2  
August 2020 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            
October 2017 Dutch Auction Tender Offer [Member]                    
Stockholders Equity [Line Items]                    
Forward share repurchase transactions amount             $ 1.6      
Contingent value right agreement term             2 years      
Non-transferable contractual contingent value right agreement initial fair value                   $ 7.3
CVR expiration period             2019-08      
Gain (loss) recognized in other expense               $ 0.0 $ 15.7  
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