Convertible Debt, Net - Outstanding Convertible Debt and Related Debt Issuance Costs (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Debt Instrument [Line Items]
Unamortized debt discount	$ (263.4)	$ (294.8)
Debt issuance costs	(17.6)	(19.8)
Total convertible debt, net	$ 921.5	$ 887.9
1.375% Convertible Senior Notes
Debt Instrument [Line Items]
Debt, interest rate	1.375%	1.375%	1.375%
0.375% Convertible Senior Notes
Debt Instrument [Line Items]
Debt, interest rate	0.375%	0.375%	0.375%
Convertible Debt \| 1.375% Convertible Senior Notes
Debt Instrument [Line Items]
Principal amount of Senior Notes	$ 402.5	$ 402.5
Convertible Debt \| 0.375% Convertible Senior Notes
Debt Instrument [Line Items]
Principal amount of Senior Notes	$ 800.0	$ 800.0

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

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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 classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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