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Debt - Narrative (Details)		1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 02, 2020 USD ($)	Jan. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	May 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Gain (loss) on debt repayment					$ (5,000,000)	$ 15,000,000
Other expense (income), net			$ 0	$ 2,000,000	5,000,000	(15,000,000)
Repayment of principal amount outstanding					$ 600,000,000	$ 0
4.375% Notes
Debt Instrument [Line Items]
Percentage of contractual interest rate on notes			4.375%		4.375%
5.375% Notes
Debt Instrument [Line Items]
Percentage of contractual interest rate on notes			5.375%		5.375%
4.875% Notes due 2025
Debt Instrument [Line Items]
Percentage of contractual interest rate on notes			4.875%		4.875%
1.125% Convertible notes
Debt Instrument [Line Items]
Percentage of contractual interest rate on notes			1.125%		1.125%
Term loan facility
Debt Instrument [Line Items]
Debt term					5 years
Term loan facility | Incremental Term Loan
Debt Instrument [Line Items]
Face amount							$ 500,000,000	$ 150,000,000
Consolidated net leverage ratio							3
Term loan facility | Credit facility
Debt Instrument [Line Items]
Maximum borrowing capacity							$ 1,000,000,000.0	500,000,000
Amount outstanding under letter of credit			$ 0		$ 0
Term loan facility | Swingline sub facility
Debt Instrument [Line Items]
Maximum borrowing capacity								$ 15,000,000
Term loan facility | Letter of credit sub-facility
Debt Instrument [Line Items]
Maximum borrowing capacity							$ 100,000,000
Senior notes | 4.375% Notes
Debt Instrument [Line Items]
Face amount	$ 800,000,000
Percentage of contractual interest rate on notes	4.375%
Deferred issuance cost	$ 11,000,000
Senior notes | 5.375% Notes
Debt Instrument [Line Items]
Face amount			$ 700,000,000		$ 700,000,000
Percentage of contractual interest rate on notes			5.375%		5.375%
Senior notes | 4.875% Notes due 2025
Debt Instrument [Line Items]
Face amount			$ 330,000,000		$ 330,000,000
Percentage of contractual interest rate on notes			4.875%		4.875%
Convertible debt | 4.375% Notes
Debt Instrument [Line Items]
Repayment of principal amount outstanding	$ 600,000,000
Convertible debt | 1.125% Convertible notes
Debt Instrument [Line Items]
Percentage of contractual interest rate on notes			1.125%		1.125%				1.125%
Repayments of debt		$ 39,000,000
Debt net of unamortized discount			$ 0		$ 0				$ 12,000,000

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Long-Term Debt, Current Maturities, Net Of Unamortized Premium (Discount)

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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