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Debt - Conversion Value of Convertible Notes (Details) - Senior Notes - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Total by which the notes’ if-converted value exceeds their principal amount $ 1,939.1 $ 1,077.5
Convertible Notes due 2023    
Debt Instrument [Line Items]    
Total by which the notes’ if-converted value exceeds their principal amount 1,797.3 1,077.5
Convertible Notes due 2025    
Debt Instrument [Line Items]    
Total by which the notes’ if-converted value exceeds their principal amount $ 141.8 $ 0.0