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Shareholders' Deficit - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 24, 2018 | Oct. 30, 2018 USD ($) | May 31, 2018 USD ($) $ / shares shares | Oct. 31, 2017 USD ($) $ / shares shares | Feb. 28, 2014 USD ($) $ / shares shares | Mar. 31, 2014 USD ($) | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) shares
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Common shares, shares outstanding | shares |  |  |  |  |  |  | 142,800,000 | 164,700,000 | 186,300,000
Preference shares authorized | shares |  |  |  |  |  |  | 7,500,000 |  |
Preference shares par value | $ / shares |  |  |  |  |  |  | $ 0.002 |  |
Dividends paid |  |  |  |  |  |  | $ 0 | $ 0 | $ 0
Share repurchase program authorized amount |  | $ 1,500,000,000 |  |  |  |  | 1,500,000,000 |  |
Share repurchase program, remaining authorized capacity |  | $ 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 | shares |  |  |  |  |  |  | 13,900,000 |  |
Accumulated deficit |  |  |  |  |  |  | $ (526,300,000) | $ (248,100,000) |
Repurchase of common stock, shares | shares |  |  |  |  |  |  | 14,300,000 | 25,400,000 | 400,000
Treasury stock shares, at cost | shares |  |  |  |  |  |  | 10,000,000 | 10,000,000 |
Shares repurchases, inclusive of transaction costs and issuance of CVR value |  |  |  |  |  |  | $ 600,700,000 | $ 795,300,000 | $ 0
Withheld for tax purpose for share-based compensation plans |  |  |  |  |  |  | 145,400,000 | 60,400,000 | 13,200,000
Shares repurchases, value |  |  |  |  |  |  | 746,100,000 | 855,700,000 | 13,200,000
Payments for share repurchases |  |  |  |  |  |  | 750,300,000 | 844,200,000 | 13,200,000
Payments for share repurchases from prior period liability |  |  |  |  |  |  | 4,200,000 |  |
Share repurchases for which subsequent payment to be made |  |  |  |  |  |  |  | 4,200,000 |
Stock split conversion ratio | 2 |  |  |  |  |  |  |  |
Terminating result of portion of capped call transactions cash received |  |  |  |  |  |  | 55,900,000 |  |
Other comprehensive income (loss) before foreign currency translation adjustments reclassifications, Tax expense (benefit) |  |  |  |  |  |  | 2,700,000 | 5,700,000 | 5,200,000
Other comprehensive Unrealized Gain (Loss) on Derivatives before reclassifications, Tax expense (benefit) |  |  |  |  |  |  |  |  | (300,000)
Amounts reclassified from accumulated other comprehensive income (loss) to income, tax expense (benefit), other |  |  |  |  |  |  |  |  | 100,000
Convertible Senior Notes Due 2019 [Member] |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Stock split conversion ratio |  |  |  |  | 2 |  |  |  |
Capped call transactions [Member] |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Capped call transactions with financial institutions |  |  |  |  | $ 123,800,000 |  |  |  |
Capped call transactions price per common share | $ / shares |  |  |  |  | $ 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 | $ / shares |  |  |  |  | $ 43.14 |  |  |  |
Capped call transactions [Member] | Common Shares [Member] |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Weighted-average adjusted cap price per common share | $ / shares |  |  |  |  |  |  | 54.30 |  |
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 | shares |  |  |  |  | 19,900,000 |  |  |  |
Average cost per share of shares repurchased | $ / shares |  |  |  |  | $ 34.51 |  |  |  |
Settlement date of forward transactions |  |  |  |  |  |  | Aug. 15, 2019 |  |
Forward counterparties shares purchased and subsequently retired | shares |  |  |  |  |  |  | 13,900,000 |  |
Non-cash interest expense relating to unamortized non-cash issuance costs |  |  |  |  |  |  | $ 4,300,000 |  |
Shares outstanding under forward purchasing transactions | shares |  |  |  |  |  |  | 6,000,000 |  |
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 |  |  |  |  |  |  | $ 9,200,000 | $ 6,500,000 | $ 6,500,000
Open market purchases [Member] |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Repurchase of common stock, shares | shares |  |  |  |  |  |  |  |  | 0
Open market purchases [Member] | Indirect wholly owned subsidiary [Member] |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Average cost per share of shares repurchased | $ / shares |  |  |  |  |  |  | $ 33.90 | $ 32.81 |
Repurchase of common stock, shares | shares |  |  |  |  |  |  | 8,400 | 10,000,000 |
Repurchase of common stock, value |  |  |  |  |  |  | $ 300,000 | $ 328,600,000 |
May 2018 Dutch Auction Tender Offer [Member] |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Average cost per share of shares repurchased | $ / shares |  |  | $ 52.50 |  |  |  |  |  |
Repurchase of common stock, shares | shares |  |  | 11,400,000 |  |  |  |  |  |
Repurchase of common stock, value |  |  | $ 600,000,000 |  |  |  |  |  |
October 2017 Dutch Auction Tender Offer [Member] |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Forward share repurchase transactions amount |  |  |  |  |  |  | $ 1,600,000 |  |
Average cost per share of shares repurchased | $ / shares |  |  |  | $ 34.00 |  |  |  |  |
Repurchase of common stock, shares | shares |  |  |  | 13,500,000 |  |  |  |  |
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 |  |  | $ 15,700,000 | 6,900,000 |
CVR expiration period |  |  |  |  |  |  | 2019-08 |  |
Gain (loss) recognized in other expense |  |  |  |  |  |  | $ (8,800,000) | $ 400,000 |
Dutch Auction Tender Offer [Member] |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |
Average cost per share of shares repurchased | $ / shares |  |  |  |  |  |  | $ 52.49 | $ 33.49 |
Repurchase of common stock, shares | shares |  |  |  |  |  |  | 11,400,000 | 23,500,000 |
Repurchase of common stock, value |  |  |  |  |  |  | $ 600,300,000 | $ 786,400,000 |

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