Stockholders' Equity - Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
Jan. 31, 2021	Jan. 31, 2020	Mar. 31, 2017	Dec. 31, 2011
Stockholders' Equity Note [Abstract]
Share repurchase program, authorized amount for repurchase			$ 1,000.0	$ 500.0
Share repurchase program, remaining authorized amount for repurchase	$ 334.8
Treasury stock repurchase (in shares)	69,600	0
Treasury stock repurchase	$ 24.8
Average repurchase price per share (in dollars per share)	$ 356.61

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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