Debt - Schedule of Notes (Details) - Convertible Senior Notes - 4% Convertible Senior Dotes due 2024 - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Principal amount (face value)	$ 207,000,000	$ 0
Unamortized issuance cost	(5,000,000)	0
Unamortized debt discount	(46,000,000)	0
4% Convertible Senior Notes due 2024 (Carrying value)	$ 156,000,000	$ 0

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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