Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Narrative (Details)

v3.21.2
Fair Value Measurements - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Equity Method Investments      
Fair Value Measurements      
Investment in private company $ 1.5 $ 1.5  
Level II | Equity Method Investments      
Fair Value Measurements      
Price adjustment 0.8 0.8  
Convertible Notes due 2023      
Fair Value Measurements      
Debt instrument, fair value disclosure 427.8 427.8 $ 460.8
Convertible Notes due 2023 | Carrying Value      
Fair Value Measurements      
Convertible notes 341.0 341.0 316.6
Convertible Notes due 2025      
Fair Value Measurements      
Debt instrument, fair value disclosure 514.6 514.6 540.8
Convertible Notes due 2025 | Carrying Value      
Fair Value Measurements      
Convertible notes $ 505.4 $ 505.4 $ 439.9