Stockholders' Equity - Narrative (Details) - USD ($) shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Nov. 30, 2018
Class of Stock [Line Items]
Stock repurchase program, authorized amount					$ 1,100,000,000
Repurchases of common stock			$ 154,416,000	$ 107,880,000
Amortization expense from capitalized stock-based compensation	$ 8,900,000	$ 7,200,000	$ 16,600,000	$ 14,800,000
Common Stock
Class of Stock [Line Items]
Shares repurchased during period (in shares)	0.9		1.5
Repurchases of common stock	$ 96,200,000		$ 154,400,000