Stockholders' Equity - Share Repurchases (Details) - USD ($)	Oct. 31, 2020	Mar. 31, 2017	Dec. 31, 2011
Stockholders' Equity Note [Abstract]
Share repurchase program, maximum amount authorized		$ 1,000,000,000.0	$ 500,000,000.0
Share repurchase program, remaining authorized amount	$ 359,700,000

Amount remaining of a stock repurchase plan authorized.

No definition available.

Name:	us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant