Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Deficit - Additional Information (Detail)

v3.19.3
Shareholders' Deficit - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Oct. 30, 2018
Feb. 28, 2014
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2014
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Oct. 31, 2017
Stockholders Equity [Line Items]                    
Share repurchase program authorized amount $ 1,500,000,000 $ 1,500,000,000   $ 1,500,000,000     $ 1,500,000,000      
Share repurchase program, remaining authorized capacity 1,500,000,000 $ 113,300,000   $ 1,500,000,000     $ 1,500,000,000      
Share repurchase program expiration date   Feb. 21, 2020         Oct. 30, 2023      
Forward counterparties shares purchased and subsequently retired       4,000,000.0 2,000,000.0   6,000,000.0 10,400,000    
Accumulated deficit $ (272,000,000.0)     $ (272,000,000.0)     $ (272,000,000.0)   $ (526,300,000)  
Repurchase of common stock, shares       100,000 1,000,000.0   200,000 14,100,000    
Treasury stock shares, at cost 10,000,000.0     10,000,000.0     10,000,000.0   10,000,000.0  
Shares repurchases, inclusive of transaction costs and issuance of CVR value             $ 0 $ 600,700,000    
Withheld for tax purpose for share-based compensation plans             9,900,000 135,700,000    
Shares repurchases, value       $ 900,000 $ 54,900,000   9,900,000 736,400,000    
Payments for share repurchases             9,900,000 740,600,000    
Payments for share repurchases from prior period liability               4,200,000    
Terminating result of portion of capped call transactions cash received               55,900,000    
Other comprehensive loss before foreign currency translation adjustments reclassifications, tax expense (benefit)       $ (100,000) $ (2,400,000)   $ (1,100,000) $ (4,400,000)    
Capped call transactions [Member]                    
Stockholders Equity [Line Items]                    
Capped call transactions with financial institutions     $ 123,800,000              
Capped call transactions price per common share     $ 60.39              
Increase (decrease) in additional paid-in capital, other           $ (123,800,000)        
Terminating result of portion of capped call transactions cash received                 $ 55,900,000  
Capped call transactions [Member] | Convertible Senior Notes Due 2019 [Member]                    
Stockholders Equity [Line Items]                    
Convertible notes conversion price     $ 43.14              
Prepaid forward share repurchase transactions [Member]                    
Stockholders Equity [Line Items]                    
Forward share repurchase transactions amount     $ 685,800,000     685,800,000        
Forward transactions, shares to be purchased     19,900,000              
Average cost per share of shares repurchased     $ 34.51              
Settlement date of forward transactions             Aug. 15, 2019      
Forward counterparties shares purchased and subsequently retired 19,900,000     4,000,000.0 2,000,000.0   6,000,000.0 10,400,000    
Shares outstanding under forward purchasing transactions 0     0     0      
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       $ 200,000 $ 1,500,000   $ 1,200,000 $ 7,800,000    
Open market purchases [Member]                    
Stockholders Equity [Line Items]                    
Repurchase of common stock, shares       0 0   0      
Open market purchases [Member] | Indirect wholly owned subsidiary [Member]                    
Stockholders Equity [Line Items]                    
Average cost per share of shares repurchased               $ 33.90    
Repurchase of common stock, shares               8,400    
Repurchase of common stock, value               $ 300,000    
October 2017 Dutch Auction Tender Offer [Member]                    
Stockholders Equity [Line Items]                    
Forward share repurchase transactions amount             $ 1,600,000      
Contingent value right agreement term             2 years      
Non-transferable contractual contingent value right agreement initial fair value                   $ 7,300,000
CVR expiration period       2019-08     2019-08      
Gain (loss) recognized in other (income) expense       $ 1,300,000 $ 4,600,000   $ 15,700,000 $ (11,400,000)