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- Definition

Debt Instrument Convertible Principal Amount Exercised

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Debt Instrument, Convertible, Terms Of Conversion Feature, Conversion Amount

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- Definition

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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Payments for Repurchase of Convertible Notes

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Shares Received From Exercise Of Note Hedge

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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 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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Debt - Narrative (Details)	1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
Debt - Narrative (Details)	May 31, 2020 USD ($) $ / shares shares	Nov. 30, 2018 USD ($) d $ / shares shares	Sep. 30, 2021 USD ($) shares	Sep. 30, 2020 USD ($) shares	Sep. 30, 2021 USD ($) d shares	Sep. 30, 2020 USD ($) shares	Dec. 31, 2020 USD ($)	Dec. 31, 2018 USD ($)	Dec. 19, 2018 USD ($)	Jun. 30, 2017 USD ($)
Debt Instrument [Line Items]
Payments to repurchase convertible notes	$ 282,600,000				$ 0	$ 282,600,000
Repurchase and conversions of 2022 Notes (in shares) \| shares	1,953,067
Loss on extinguishment of debt			$ 800,000	$ 500,000	800,000	5,900,000
Proceeds from issuance of convertible notes, net of issuance costs					$ 0	1,188,800,000
Equity component of 2025 Notes issuance, net of issuance costs						$ 289,400,000
Common Stock
Debt Instrument [Line Items]
Repurchase and conversions of 2022 Notes (in shares) \| shares			200,000	400,000	200,000	3,400,000
Stock received from exercise of Note Hedge (in shares) \| shares			(100,000)		(100,000)
Additional Paid-In Capital
Debt Instrument [Line Items]
Equity component of 2025 Notes issuance, net of issuance costs						$ 289,400,000
Senior Notes
Debt Instrument [Line Items]
Principal amount			$ 2,024,900,000		$ 2,024,900,000		$ 2,057,500,000
Senior Notes \| Senior Convertible Notes due 2022
Debt Instrument [Line Items]
Principal amount	$ 260,000,000									$ 400,000,000
Debt instrument convertible principal amount exercised				$ 37,200,000		140,000,000
Loss on extinguishment of debt				$ 500,000		$ 5,900,000
Interest rate on convertible notes (as a percent)										0.75%
Redemption price (as a percent)					100.00%
Senior Notes \| Senior Convertible Notes due 2022 \| Common Stock
Debt Instrument [Line Items]
Repurchase and conversions of 2022 Notes (in shares) \| shares				375,178		1,412,497
Senior Notes \| Senior Convertible Notes due 2023
Debt Instrument [Line Items]
Principal amount		$ 850,000,000	817,400,000		$ 817,400,000		850,000,000.0
Debt instrument convertible principal amount exercised			32,600,000
Loss on extinguishment of debt			$ (800,000)
Interest rate on convertible notes (as a percent)		0.75%
Proceeds from issuance of convertible notes, net of issuance costs		$ 836,600,000
Conversion amount		$ 1,000
Conversion price of convertible notes (USD per share) \| $ / shares		$ 164.29
Stock received from exercise of Note Hedge (in shares) \| shares			122,209
Holder's repurchase price percentage in event of fundamental change (as a percent)			100.00%		100.00%
Number of trading days \| d		60
Proportion of conversion price (as a percent)					130.00%
Redemption price (as a percent)					100.00%
Common stock issued to settle converted debt (in 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
Conversion ratio		0.0060869
Senior Notes \| Senior Convertible Notes due 2023 \| Designated as Hedging Instrument
Debt Instrument [Line Items]
Stock issued upon conversion of senior notes (in shares) \| shares		5,200,000
Equity component of 2025 Notes issuance, net of issuance costs		$ 218,900,000
Senior Notes \| Senior Convertible Notes due 2023 \| Debt Instrument Conversion Term One \| Minimum
Debt Instrument [Line Items]
Number of trading days \| d					20
Proportion of applicable conversion price (as a percent)					130.00%
Senior Notes \| Senior Convertible Notes due 2023 \| Debt Instrument Conversion Term One \| Maximum
Debt Instrument [Line Items]
Number of trading days \| d					30
Senior Notes \| Senior Convertible Notes due 2023 \| Debt Instrument Conversion Term Two
Debt Instrument [Line Items]
Number of trading days \| d					5
Senior Notes \| Senior Convertible Notes due 2023 \| Debt Instrument Conversion Term Two \| Maximum
Debt Instrument [Line Items]
Number of trading days \| d					5
Proportion of applicable conversion price (as a percent)					98.00%
Senior Notes \| Senior Convertible Notes due 2023 \| Common Stock
Debt Instrument [Line Items]
Repurchase and conversions of 2022 Notes (in shares) \| shares			197,816		197,876
Treasury stock reissued (in shares) \| shares			45,745		45,745
Senior Notes \| Senior Convertible Notes due 2023 \| Additional Paid-In Capital
Debt Instrument [Line Items]
Recognized additional paid-in capital from cash conversion option								$ 171,600,000
Senior Notes \| Senior Convertible Notes due 2025
Debt Instrument [Line Items]
Principal amount	$ 1,210,000,000		$ 1,207,500,000		$ 1,207,500,000		1,207,500,000
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 price of convertible notes (USD per share) \| $ / shares	$ 600.42
Holder's repurchase price percentage in event of fundamental change (as a percent)			100.00%		100.00%
Proportion of conversion price (as a percent)					130.00%
Conversion ratio	0.0016655
Senior Notes \| Senior Convertible Notes due 2025 \| Designated as Hedging Instrument
Debt Instrument [Line Items]
Recognized additional paid-in capital from cash conversion option							$ 289,400,000
Senior Notes \| Senior Convertible Notes due 2025 \| Maximum
Debt Instrument [Line Items]
Conversion ratio	0.0023732
Senior Notes \| Senior Convertible Notes due 2025 \| Debt Instrument Conversion Term One \| Minimum
Debt Instrument [Line Items]
Number of trading days \| d					20
Proportion of applicable conversion price (as a percent)					130.00%
Senior Notes \| Senior Convertible Notes due 2025 \| Debt Instrument Conversion Term One \| Maximum
Debt Instrument [Line Items]
Number of trading days \| d					30
Senior Notes \| Senior Convertible Notes due 2025 \| Debt Instrument Conversion Term Two
Debt Instrument [Line Items]
Number of trading days \| d					5
Senior Notes \| Senior Convertible Notes due 2025 \| Debt Instrument Conversion Term Two \| Maximum
Debt Instrument [Line Items]
Number of trading days \| d					5
Proportion of applicable conversion price (as a percent)					98.00%
Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity of revolving credit agreement			$ 200,000,000.0		$ 200,000,000.0				$ 200,000,000.0
Option to increase revolving line of credit									$ 500,000,000
Value of unrestricted cash on hand threshold					$ 100,000,000
Line of Credit \| Minimum
Debt Instrument [Line Items]
Interest rate on convertible notes (as a percent)			0.375%		0.375%
Unused capacity fee (as a percent)					0.20%
Line of Credit \| Minimum \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.375%
Line of Credit \| Maximum
Debt Instrument [Line Items]
Interest rate on convertible notes (as a percent)			1.00%		1.00%
Unused capacity fee (as a percent)					0.30%
Line of Credit \| Maximum \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					2.00%