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Fair Value Measurements (Details) - USD ($)
$ / shares in Units, $ in Millions
Sep. 30, 2020
Jun. 30, 2020
Term loan    
Debt Instrument [Line Items]    
Estimated fair value of loan $ 592 $ 608
4.50% Convertible Senior Notes due 2026    
Debt Instrument [Line Items]    
Estimated fair value of loan $ 52 $ 58
Interest rate (as a percent) 4.50%  
Initial conversion price $ 15.29