Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

The cash outflow for cost incurred directly with the issuance of an equity security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

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- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

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- Definition

Per share or per unit amount of equity securities issued.

+ References

No definition available.

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended
	Jul. 31, 2021	Sep. 30, 2020	Oct. 31, 2019	Apr. 30, 2019	Jun. 30, 2021	Dec. 31, 2020
Subsequent Event [Line Items]
Common stock, shares issued					88,498,000	86,223,000
Equity offering
Subsequent Event [Line Items]
Common stock, shares issued		4,791,665	6,571,428	6,052,631
Stock issued (in dollars per share)		$ 60.00	$ 35	$ 19
Payment of offering expenses		$ 0.3	$ 0.4	$ 0.6
Proceeds from issuance of common stock		$ 271.0	$ 216.2	$ 108.1
Equity offering \| Subsequent Event
Subsequent Event [Line Items]
Common stock, shares issued	5,175,000
Stock issued (in dollars per share)	$ 113
Payment of offering expenses	$ 0.4
Proceeds from issuance of common stock	$ 551.2