Annual report pursuant to Section 13 and 15(d)

Shareholders' (Deficit) Equity - Additional Information (Detail)

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Shareholders' (Deficit) Equity - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2017
Feb. 28, 2014
Mar. 31, 2014
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jan. 31, 2018
Feb. 21, 2017
Stockholders Equity [Line Items]                
Common shares, shares outstanding       82,300,000 93,100,000 92,700,000    
Preference shares authorized       7,500,000        
Preference shares par value       $ 0.002        
Dividends paid       $ 0 $ 0 $ 0    
Share repurchase program authorized amount       1,500,000,000     $ 1,500,000,000 $ 1,500,000,000
Share repurchase program, remaining authorized capacity       $ 713,600,000 $ 233,000,000      
Share repurchase program expiration date       Feb. 21, 2020 Jun. 30, 2017      
Share repurchase transaction, shares to be purchased       9,900,000        
Retained earnings (accumulated deficit)       $ (248,100,000) $ (66,300,000)      
Repurchase of common stock, shares       12,700,000 200,000 400,000    
Repurchase of common stock, value       $ 855,700,000 $ 13,200,000 $ 16,600,000    
Treasury stock shares, at cost       5,000,000        
Shares repurchases, inclusive of transaction costs and issuance of CVR value       $ 795,300,000 0 0    
Withheld for tax purpose for share-based compensation plans       60,400,000 13,200,000 16,600,000    
Payments for share repurchases       844,200,000 13,200,000 16,600,000    
Share repurchases for which subsequent payment to be made       4,200,000        
Other comprehensive income (loss) before foreign currency translation adjustments reclassifications, Tax expense (benefits)       $ 5,700,000 5,200,000 (7,200,000)    
Other comprehensive Unrealized Gain (Loss) on Derivatives before reclassifications, Tax expense (benefits)         (300,000) (600,000)    
Amounts reclassified from accumulated other comprehensive income (loss) to income, tax expense (benefits), other         100,000      
Other comprehensive Unrealized Gain (Loss) on Available-For-Sale Investments before reclassifications, Tax expense (benefits)           (900,000)    
Amounts reclassified from accumulated other comprehensive income (loss) to income, tax expense (benefits) unrealized gain (loss) on available-for-sale investments           800,000    
Capped call transactions [Member]                
Stockholders Equity [Line Items]                
Capped call transactions with financial institutions   $ 123,800,000            
Capped call transactions price per common share   $ 120.79            
Increase (decrease) in additional paid-in capital, other     $ (123,800,000)          
Capped call transactions [Member] | Convertible Notes [Member]                
Stockholders Equity [Line Items]                
Convertible notes initial conversion price   $ 86.28            
Prepaid forward share repurchase transactions [Member]                
Stockholders Equity [Line Items]                
Forward share repurchase transactions amount   $ 685,800,000 685,800,000          
Share repurchase transaction, shares to be purchased   9,900,000            
Average cost per share of shares repurchased   $ 69.02            
Settlement date of forward transactions       Aug. 15, 2019        
Retained earnings (accumulated deficit)     (653,900,000)          
Additional paid-in-capital     31,900,000          
Non-cash forward transaction issuance costs     $ 35,800,000          
Non-cash interest expense relating to amortization of non-cash issuance costs       $ 6,500,000 $ 6,500,000 $ 6,500,000    
Open market purchases [Member]                
Stockholders Equity [Line Items]                
Average cost per share of shares repurchased       $ 66.98        
Repurchase of common stock, shares       11,700,000 0 0    
Repurchase of common stock, value       $ 786,400,000        
Open market purchases [Member] | Indirect wholly owned subsidiary [Member]                
Stockholders Equity [Line Items]                
Average cost per share of shares repurchased       $ 65.61        
Repurchase of common stock, shares       5,000,000        
Repurchase of common stock, value       $ 328,600,000        
Dutch Auction Tender Offer [Member]                
Stockholders Equity [Line Items]                
Forward share repurchase transactions amount       $ 1,600,000        
Average cost per share of shares repurchased $ 68.00              
Repurchase of common stock, shares 6,700,000              
Repurchase of common stock, value $ 457,800,000              
Contingent value right agreement term       2 years        
Non-transferable contractual contingent value right agreement initial fair value $ 7,300,000     $ 6,900,000        
CVR expiration period       2019-08