Stockholders' Equity (Details) - $ / shares	1 Months Ended	12 Months Ended
	Dec. 31, 2019	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Share Repurchase Program
Number of shares purchased		6,619,000	12,108,000	7,694,000
Average price per share		$ 35.28	$ 41.56	$ 37.81
Remaining authorization at October 31		13,953,000	10,989,000	8,144,000
Subsequent Event [Member]
Share Repurchase Program
Number of shares purchased	3,600,000
Average price per share	$ 39.58