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Stockholders' Equity (Deficit) - Sale of Stock (Details) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended
	Feb. 11, 2021	Apr. 03, 2018	Feb. 28, 2021	Dec. 31, 2020	Dec. 31, 2019
Subsidiary, Sale of Stock [Line Items]
Common stock, par value (in dollars per share)				$ 0.01	$ 0.01
Equity Offering
Subsidiary, Sale of Stock [Line Items]
Newly issued shares of common stock in registered public offering (shares)		5,300,000
Common stock, par value (in dollars per share)		$ 0.01
Price per share (usd per share)		$ 175
Proceeds		$ 915.2
Underwriting discounts		11.7
Offering expenses		$ 0.6
Equity Offering | Subsequent Event
Subsidiary, Sale of Stock [Line Items]
Newly issued shares of common stock in registered public offering (shares)	7,475,000
Common stock, par value (in dollars per share)	$ 0.01
Price per share (usd per share)	$ 115.00
Proceeds	$ 842.4		$ 842.5
Underwriting discounts	$ 17.2

X

- Definition

Face amount or stated value per share of common stock.

+ References

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=6877327&loc=d3e13212-122682

+ Details

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X

- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

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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.

+ References

No definition available.

+ Details

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X

- Definition

Sale of Stock, Offering Expenses

+ References

No definition available.

+ Details

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X

- Definition

Sale of Stock, Underwriting Discounts

+ References

No definition available.

+ Details

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- Details

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- Details

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