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Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	May 24, 2019	Jun. 30, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Common stock, authorized shares (in shares)		500,000,000	500,000,000
Common stock, par value (in dollars per share)		$ 0.01	$ 0.01
Common stock, issued shares (in shares)		101,434,104	89,682,387
Common stock, outstanding shares (in shares)		101,434,104	89,682,387
Offering price per share (in dollars per share)	$ 26.00	$ 23.25
Payments of stock issuance costs	$ 16.0	$ 13.4
Preferred stock, authorized (in shares)		200,000,000
Preferred stock, par value (in dollars per share)		$ 0.01
Preferred stock, shares issued (in shares)		0
Preferred stock, shares outstanding (in shares)		0
Convertible debt securities
Class of Stock [Line Items]
Common stock shares reserved for issuance (in shares)		11,492,280
Common stock options
Class of Stock [Line Items]
Common stock shares reserved for issuance (in shares)		13,271,513
Unvested restricted stock and RSUs
Class of Stock [Line Items]
Common stock shares reserved for issuance (in shares)		868,210
Public Stock Offering
Class of Stock [Line Items]
Shares sold in offering	10,657,692	11,155,000
Aggregate net proceeds from stock offering	$ 261.1	$ 245.9
Over-Allotment Option
Class of Stock [Line Items]
Shares sold in offering	1,042,307	1,455,000
Public Stock Offering - Shares From Company's Chairman and Chief Executive Officer
Class of Stock [Line Items]
Shares sold in offering	400,000

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