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Fair Value Measurements - Schedule of Carrying Amounts and Estimated Fair Values (Details)
$ in Millions
Mar. 31, 2021
USD ($)
Net Carrying Amount | 2025 Convertible Senior Notes  
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]  
Convertible senior notes $ 150.3
Net Carrying Amount | 2028 Convertible Senior Notes  
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]  
Convertible senior notes 185.8
Estimated Fair Value | 2025 Convertible Senior Notes  
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]  
Convertible senior notes 186.1
Estimated Fair Value | 2028 Convertible Senior Notes  
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]  
Convertible senior notes $ 286.4