The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4332-108586

Convertible Senior Notes - Additional Information (Details)		3 Months Ended	9 Months Ended
	Jun. 18, 2021 USD ($) d $ / shares shares	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)
Debt Instrument [Line Items]
Net proceeds from offering, after deducting commissions paid to initial purchasers and debt issuance costs paid to third-parties			$ 625,000,000
Net carrying value of debt		$ 609,811,000	$ 609,811,000
0.75% Unsecured Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Debt instrument aggregate principal amount	$ 625,000,000.0
Debt instrument interest rate	0.75%
Aggregate principal amount exercise in overallotment option granted to initial purchasers	$ 75,000,000.0
Long-term debt, frequency of periodic payment			semiannually
Long-term debt, beginning date of payment	Jan. 01, 2022
Long-term debt, maturity date	Jul. 01, 2026
Long-term debt payment terms			The Notes bear interest at a rate of 0.75% per annum, payable semiannually in arrears on January 1 and July 1 of each year, beginning on January 1, 2022.
Net proceeds from offering, after deducting commissions paid to initial purchasers and debt issuance costs paid to third-parties	$ 608,900,000
Debt conversion, each principal amount initially be convertible	$ 1,000
Initial conversion price per share \| $ / shares	$ 56.01
Debt instrument conversion date	Apr. 01, 2026
Unamortized debt discount and debt issuance costs		15,200,000	$ 15,200,000
Net carrying value of debt		609,800,000	609,800,000
Interest expense		$ 2,000,000.0	$ 2,300,000
Effective interest rate		1.30%	1.30%
0.75% Unsecured Convertible Senior Notes Due 2026 \| Level 2
Debt Instrument [Line Items]
Estimated fair value of notes		$ 504,100,000	$ 504,100,000
0.75% Unsecured Convertible Senior Notes Due 2026 \| During any Fiscal Quarter Commencing After Fiscal Quarter Ending on September 30, 2021
Debt Instrument [Line Items]
Consecutive trading days \| d	30
0.75% Unsecured Convertible Senior Notes Due 2026 \| During any Fiscal Quarter Commencing After Fiscal Quarter Ending on September 30, 2021 \| Minimum
Debt Instrument [Line Items]
Trading days \| d	20
Conversion price	130.00%
0.75% Unsecured Convertible Senior Notes Due 2026 \| During Five Consecutive Business Day Period After any Ten Consecutive Trading Day Period
Debt Instrument [Line Items]
Debt conversion, each principal amount initially be convertible	$ 1,000
Consecutive trading days \| d	10
0.75% Unsecured Convertible Senior Notes Due 2026 \| During Five Consecutive Business Day Period After any Ten Consecutive Trading Day Period \| Maximum
Debt Instrument [Line Items]
Conversion price	98.00%
0.75% Unsecured Convertible Senior Notes Due 2026 \| Company May Redeem On or after July 6, 2024
Debt Instrument [Line Items]
Consecutive trading days \| d	30
Redemption percentage of principal amount	100.00%
0.75% Unsecured Convertible Senior Notes Due 2026 \| Company May Redeem On or after July 6, 2024 \| Minimum
Debt Instrument [Line Items]
Trading days \| d	20
Conversion price	130.00%
0.75% Unsecured Convertible Senior Notes Due 2026 \| Common Stock
Debt Instrument [Line Items]
Debt conversion, for each principal amount conversion to shares \| shares	17.8527