Annual report pursuant to Section 13 and 15(d)

Long-term Debt - Summary of Terms of Convertible Notes (Details)

v3.20.4
Long-term Debt - Summary of Terms of Convertible Notes (Details) - Convertible Notes Payable
$ / shares in Units, equity_instrument in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
equity_instrument
$ / shares
2022 Convertible Notes  
Debt Instrument [Line Items]  
Principal | $ $ 150
Stated Interest Rate 4.125%
Conversion rate of shares for each $1,000 principal amount of convertible notes 36.7680
Conversion price per share (in usd per share) $ 27.20
Issuable Shares | equity_instrument 5.5
Dividend threshold amount $ 0.33
2023 Convertible Notes  
Debt Instrument [Line Items]  
Principal | $ $ 144
Stated Interest Rate 0.00%
Conversion rate of shares for each $1,000 principal amount of convertible notes 20.6779
Conversion price per share (in usd per share) $ 48.36
Issuable Shares | equity_instrument 3.0
Dividend threshold amount $ 0.34