Common Stock, Preferred Stock and Equity Plans - Share Repurchase Program (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Nov. 30, 2020	Jul. 31, 2019	Jun. 30, 2019
Equity, Class of Treasury Stock [Line Items]
Repurchases of common stock		$ 539,136,000	$ 186,020,000	$ 350,043,000
Share Repurchase Program 2018
Equity, Class of Treasury Stock [Line Items]
Number of shares authorized to be repurchased				$ 500,000,000.0			$ 500,000,000.0
Repurchases of common stock (in shares)			832,186	2,093,891
Repurchases of common stock			$ 150,000,000.0	$ 350,000,000.0
Share Repurchase Program 2019
Equity, Class of Treasury Stock [Line Items]
Number of shares authorized to be repurchased						$ 500,000,000.0
Repurchases of common stock (in shares)		2,058,962	213,548
Repurchases of common stock		$ 464,000,000.0	$ 36,000,000.0
Number of shares remaining for repurchases	$ 500,000,000.0	500,000,000.0
Share Repurchase Program 2020
Equity, Class of Treasury Stock [Line Items]
Number of shares authorized to be repurchased					$ 500,000,000.0
Repurchases of common stock (in shares)	345,897
Repurchases of common stock	$ 75,100,000
Number of shares remaining for repurchases	$ 424,900,000	$ 424,900,000