Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Deficit - Additional Information (Detail)

v3.20.1
Shareholders' Deficit - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2020
Oct. 30, 2018
Feb. 28, 2014
Mar. 31, 2020
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Mar. 31, 2014
Dec. 31, 2018
Dec. 31, 2019
Oct. 31, 2017
Stockholders Equity [Line Items]                      
Share repurchase program authorized amount $ 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              
Share repurchase program expiration date   Feb. 21, 2020   Oct. 30, 2023              
Forward counterparties shares purchased and subsequently retired           2,000,000.0          
Accumulated deficit $ (169,700,000)     $ (169,700,000)           $ (215,300,000)  
Repurchase of common stock, shares       100,000   100,000          
Treasury stock shares, at cost 10,000,000.0     10,000,000.0           10,000,000.0  
Shares repurchases, inclusive of transaction costs and issuance of CVR value       $ 0   $ 0          
Withheld for tax purpose for share-based compensation plans       4,700,000   7,600,000          
Shares repurchases, value       4,700,000   7,600,000          
Other comprehensive income (loss) before foreign currency translation adjustments reclassifications, tax expense (benefit)       (2,500,000)   $ 500,000          
Other comprehensive loss before unrealized gain (loss) on derivatives adjustments reclassifications, tax expense (benefit)       $ 300,000              
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         2,000,000.0          
Non-cash interest expense relating to amortization of non-cash issuance costs       $ 700,000   $ 200,000          
Shares outstanding under forward purchasing transactions 0     0              
Accumulated deficit               (653,900,000)      
Additional paid-in-capital               (31,900,000)      
Non-cash forward transaction issuance costs               $ 35,800,000      
Open market purchases [Member]                      
Stockholders Equity [Line Items]                      
Repurchase of common stock, shares         0   0        
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              
Gain (loss) recognized in other (income) expense       $ 8,500,000   $ 8,500,000