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Debt Instrument Convertible Principal Amount Exercised

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Debt Instrument, Covenant Repurchase Price, Percentage

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Debt Instrument, Redemption Covenant, Percent Of Conversion Price, Last Reported Sale Price Of Common Stock

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Line of Credit Facility, Maximum Borrowing Capacity, Option to Increase, Amount

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Line of Credit Facility, Maturity, Conditional Restrictions, Value of Unrestricted Cash on Hand Threshold

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Payments for Repurchase of Convertible Notes

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Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital.

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Exercise price per share or per unit of warrants or rights outstanding.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The price per share of the conversion feature embedded in the debt instrument.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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The amount of the liability for the conversion option reclassified to stockholders' equity when the embedded option no longer required separation from the host instrument.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

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Number of shares issued during the period as a result of the conversion of convertible securities.

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Debt - Narrative (Details)		1 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
Debt - Narrative (Details)	Jun. 29, 2020	May 31, 2020 USD ($) shares	Nov. 30, 2018 USD ($) d $ / shares shares	Jun. 30, 2017 USD ($)	Jun. 30, 2017 d	Sep. 30, 2020 USD ($) shares	Dec. 31, 2020 USD ($) trading_day d shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) $ / shares	Dec. 19, 2018 USD ($)	Jun. 12, 2017 USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of convertible notes, net of issuance costs							$ 1,188,800,000	$ 0	$ 836,600,000
Repurchase of convertible notes		$ 282,600,000					282,600,000	0	0
Repurchase and conversions of 2022 notes (in shares) \| shares		1,953,067
Loss on extinguishment of debt						$ 5,900,000	(5,900,000)	0	0
Equity component of convertible note issuance, net of issuance costs							289,400,000		171,600,000
Proceeds from sale of warrants							0	0	183,800,000
Senior Notes
Debt Instrument [Line Items]
Total principal amount							2,057,500,000	1,250,000,000.0
Senior Notes \| Convertible Notes due 2023
Debt Instrument [Line Items]
Total principal amount			$ 850,000,000.0				$ 850,000,000.0	850,000,000.0
Interest rate on convertible notes (as a percent)			0.75%
Proceeds from issuance of convertible notes, net of issuance costs			$ 836,600,000
Conversion ratio			0.0060869000	0.0100918000
Conversion price of convertible notes (USD per share) \| $ / shares			$ 164.29
Holder's repurchase price percentage in event of fundamental change (as a percent)							100.00%
Number of trading days \| d			60
Proportion of conversion price (as a percent)							130.00%
Redemption price (as a percent)							100.00%
Stock counterparties to acquire with warrants purchased (shares) \| shares			5,200,000
Proceeds from sale of warrants			$ 183,800,000
Exercise price of warrants or rights (USD per share) \| $ / shares			$ 198.38
Senior Notes \| Convertible Notes due 2022
Debt Instrument [Line Items]
Total principal amount		$ 260,000,000.0					$ 0	400,000,000.0				$ 400,000,000.0
Interest rate on convertible notes (as a percent)										0.75%
Proceeds from issuance of convertible notes, net of issuance costs				$ 389,000,000.0
Conversion price of convertible notes (USD per share) \| $ / shares										$ 99.09
Holder's repurchase price percentage in event of fundamental change (as a percent)				100.00%	100.00%
Proportion of conversion price (as a percent)					140.00%
Redemption price (as a percent)	100.00%				100.00%
Debt Instrument Convertible Principal Amount Exercised						$ 140,000,000.0
Senior Notes \| Convertible Notes due 2025
Debt Instrument [Line Items]
Total principal amount		$ 1,210,000,000					1,207,500,000	$ 0
Interest rate on convertible notes (as a percent)		0.25%
Proceeds from issuance of convertible notes, net of issuance costs		$ 1,190,000,000
Conversion ratio		600.42	0.0016655000
Recognized additional paid-in capital from cash conversion option							$ 289,400,000
Holder's repurchase price percentage in event of fundamental change (as a percent)							100.00%
Proportion of conversion price (as a percent)							130.00%
Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity of revolving credit agreement							$ 200,000,000.0				$ 200,000,000.0
Option to increase revolving line of credit											$ 500,000,000.0
Value of unrestricted cash on hand threshold							$ 100,000,000.0
Line of Credit \| Minimum
Debt Instrument [Line Items]
Interest rate on convertible notes (as a percent)							0.375%
Unused capacity fee (as a percent)							0.20%
Line of Credit \| Maximum
Debt Instrument [Line Items]
Interest rate on convertible notes (as a percent)							1.00%
Unused capacity fee (as a percent)							0.30%
Additional Paid-In Capital
Debt Instrument [Line Items]
Equity component of convertible note issuance, net of issuance costs							$ 289,400,000		171,600,000
Additional Paid-In Capital \| Senior Notes \| Convertible Notes due 2023
Debt Instrument [Line Items]
Recognized additional paid-in capital from cash conversion option									$ 171,600,000
Additional Paid-In Capital \| Senior Notes \| Convertible Notes due 2022
Debt Instrument [Line Items]
Recognized additional paid-in capital from cash conversion option										$ 70,600,000
Common Stock
Debt Instrument [Line Items]
Repurchase and conversions of 2022 notes (in shares) \| shares							3,400,000
Common Stock \| Senior Notes \| Convertible Notes due 2022
Debt Instrument [Line Items]
Repurchase and conversions of 2022 notes (in shares) \| shares						1,412,497
Debt Instrument Conversion Term One \| Senior Notes \| Convertible Notes due 2023 \| Minimum
Debt Instrument [Line Items]
Number of trading days \| d							20
Proportion of applicable conversion price (as a percent)							130.00%
Debt Instrument Conversion Term One \| Senior Notes \| Convertible Notes due 2023 \| Maximum
Debt Instrument [Line Items]
Number of trading days \| d							30
Debt Instrument Conversion Term One \| Senior Notes \| Convertible Notes due 2022 \| Minimum
Debt Instrument [Line Items]
Number of trading days \| d					20
Proportion of applicable conversion price (as a percent)					130.00%
Debt Instrument Conversion Term One \| Senior Notes \| Convertible Notes due 2022 \| Maximum
Debt Instrument [Line Items]
Number of trading days \| d					30
Debt Instrument Conversion Term One \| Senior Notes \| Convertible Notes due 2025 \| Minimum
Debt Instrument [Line Items]
Number of trading days \| trading_day							20
Proportion of applicable conversion price (as a percent)							130.00%
Debt Instrument Conversion Term One \| Senior Notes \| Convertible Notes due 2025 \| Maximum
Debt Instrument [Line Items]
Number of trading days \| trading_day							30
Debt Instrument Conversion Term Two \| Senior Notes \| Convertible Notes due 2023
Debt Instrument [Line Items]
Number of trading days \| d							5
Debt Instrument Conversion Term Two \| Senior Notes \| Convertible Notes due 2023 \| Maximum
Debt Instrument [Line Items]
Number of trading days \| d							5
Proportion of applicable conversion price (as a percent)							98.00%
Debt Instrument Conversion Term Two \| Senior Notes \| Convertible Notes due 2022
Debt Instrument [Line Items]
Number of trading days \| d					5
Debt Instrument Conversion Term Two \| Senior Notes \| Convertible Notes due 2022 \| Maximum
Debt Instrument [Line Items]
Number of trading days \| d					5
Proportion of applicable conversion price (as a percent)					98.00%
Debt Instrument Conversion Term Two \| Senior Notes \| Convertible Notes due 2025
Debt Instrument [Line Items]
Number of trading days \| trading_day							5
Debt Instrument Conversion Term Two \| Senior Notes \| Convertible Notes due 2025 \| Maximum
Debt Instrument [Line Items]
Number of trading days \| trading_day							5
Proportion of applicable conversion price (as a percent)							98.00%
Designated as Hedging Instrument \| Senior Notes \| Convertible Notes due 2023
Debt Instrument [Line Items]
Stock issued upon conversion of senior notes (shares) \| shares			5,200,000
Equity component of convertible note issuance, net of issuance costs			$ 218,900,000
London Interbank Offered Rate (LIBOR) \| Line of Credit \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)							1.375%
London Interbank Offered Rate (LIBOR) \| Line of Credit \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)							2.00%