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Shareholders' Equity - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Dec. 31, 2020
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) 115,239,269     102,763,060
Common stock, outstanding shares (in shares) 115,239,269     102,763,060
Offering price per share (in dollars per share) $ 25.00   $ 23.25  
Payments of stock issuance costs $ 17.5   $ 13.5  
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      
Public Stock Offering        
Class of Stock [Line Items]        
Shares sold in offering (in shares) 11,500,000   11,155,000  
Aggregate net proceeds from stock offering $ 270.1   $ 245.9  
Over-Allotment Option        
Class of Stock [Line Items]        
Shares sold in offering (in shares) 1,500,000   1,455,000  
ATM Program        
Class of Stock [Line Items]        
Common stock authorized, aggregate gross sales proceeds (up to)   $ 250.0    
Convertible debt securities        
Class of Stock [Line Items]        
Common stock shares reserved for issuance (in shares) 23,438,430      
Common stock options        
Class of Stock [Line Items]        
Common stock shares reserved for issuance (in shares) 14,448,585      
Unvested restricted stock and RSUs        
Class of Stock [Line Items]        
Common stock shares reserved for issuance (in shares) 1,124,648