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Shareholders' Deficit - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Oct. 30, 2018 | Feb. 28, 2014 | Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2014 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2019
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 | 1,482,900,000 | $ 113,300,000 |  | 1,482,900,000 |  |  | $ 1,482,900,000 |  |  |
Share repurchase program expiration date |  | Feb. 21, 2020 |  |  |  |  | Oct. 30, 2023 |  |  |
Forward counterparties shares purchased and subsequently retired |  |  |  |  |  |  |  | 2,000,000.0 |  |
Accumulated deficit | $ (70,600,000) |  |  | (70,600,000) |  |  | $ (70,600,000) |  |  | $ (215,300,000)
Shares repurchases, value |  |  |  | $ 21,300,000 | $ 1,400,000 |  | $ 26,000,000.0 | $ 9,000,000.0 |  |
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 |  |  |  |  |  |  | $ 17,100,000 | 0 |  |
Withheld for tax purpose for share-based compensation plans |  |  |  |  |  |  | 8,900,000 | 9,000,000.0 |  |
Other comprehensive income (loss) before foreign currency translation adjustments reclassifications, tax expense (benefit) |  |  |  | $ (2,300,000) | (1,500,000) |  | (4,800,000) | (1,000,000.0) |  |
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 |  |  |  |  |  |  |  |  |
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 |  |  |  |  | $ 300,000 |  |  | $ 1,000,000.0 |  |
Open Market Repurchase Plan |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |
Average cost per share of shares repurchased |  |  |  |  |  |  | $ 39.27 |  |  |
Shares repurchases, value |  |  |  |  |  |  | $ 17,100,000 |  |  |
Repurchase of common stock, shares |  |  |  |  |  |  | 400,000 | 0 |  |

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