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Related Party Transaction (Details) - USD ($)		12 Months Ended
	Jul. 01, 2020	Dec. 31, 2020	Dec. 31, 2019	Mar. 05, 2019
Related Party Transaction [Line Items]
Borrowed federal funds		$ 50,000,000.0	$ 50,000,000.0
Sale of stock, consideration received on transaction	$ 90,000,000
Sale of stock, percentage of ownership	4.70%
Common Stock Issued | Private Placement
Related Party Transaction [Line Items]
Sale of stock, number of shares Issued in transaction (in shares)	577,254
Sale of stock, consideration received on transaction	$ 90,000,000.0
Convertible Senior Notes Due 2027 | Convertible Debt
Related Party Transaction [Line Items]
Aggregate amount	$ 310,000,000.0
Discovery Benefits, Inc.
Related Party Transaction [Line Items]
Ownership percentage by noncontrolling interest		4.90%		4.90%

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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- Definition

Average amount borrowed under the credit facility during the period.

+ References

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

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- Definition

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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- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

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- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

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- Definition

Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction.

+ References

No definition available.

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