Debt - Summary of Conversion and Redemption Options and Details Related to Capped Call Confirmations (Details) - Convertible Debt	6 Months Ended
	Jun. 30, 2020 $ / shares	May 15, 2020 $ / shares
1.375% convertible senior notes due 2026
Debt Instrument [Line Items]
Debt instrument, conversion rate shares	0.0229830
Conversion Price per Share (usd per share)	$ 43.51
Initial cap price (usd per share)	$ 80.5750
Cap Price Premium	150.00%
2.75% convertible senior notes due 2025
Debt Instrument [Line Items]
Debt instrument, conversion rate shares	0.0148810
Conversion Price per Share (usd per share)	$ 67.20	$ 67.20
0.75% convertible senior notes due 2024
Debt Instrument [Line Items]
Debt instrument, conversion rate shares	0.0229830
Conversion Price per Share (usd per share)	$ 43.51
Initial cap price (usd per share)	$ 72.5175
Cap Price Premium	125.00%
1.50% convertible senior notes due 2023
Debt Instrument [Line Items]
Debt instrument, conversion rate shares	0.0127592
Conversion Price per Share (usd per share)	$ 78.37
Initial cap price (usd per share)	$ 105.45
Cap Price Premium	85.00%
2.00% convertible senior notes due 2021
Debt Instrument [Line Items]
Debt instrument, conversion rate shares	0.0190985
Conversion Price per Share (usd per share)	$ 52.36
Initial cap price (usd per share)	$ 69.19
Cap Price Premium	85.00%