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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 01, 2021
Jan. 14, 2021
Jul. 02, 2020
Dec. 31, 2019
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Accounting Policies [Abstract]              
Cash and cash equivalents         $ 1,092.4 $ 570.8  
Restricted cash         0.3 0.6  
Total cash, cash equivalents and restricted cash       $ 270.3 $ 1,092.7 $ 571.4 $ 258.8
Sale of Stock [Line Items]              
Offering costs $ 0.4   $ 32.4        
Offering costs - component of gross proceeds     $ 28.9        
Offering costs - component of expense       $ 3.5      
Public Stock Offering              
Sale of Stock [Line Items]              
Net proceeds from sale   $ 525.7          
Underwriter's option              
Sale of Stock [Line Items]              
Net proceeds from sale $ 114.6 $ 114.6