Borrowing Arrangements - Fair Value of Market Price (Details) - Senior Notes - USD ($)	Jan. 31, 2022	Oct. 31, 2021	Jan. 31, 2020	Jun. 30, 2015	Dec. 31, 2012
2012 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 350,000,000.0				$ 350,000,000
Fair value	355,800,000
2015 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount	300,000,000.0			$ 300,000,000
Fair value	320,400,000
2017 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount	500,000,000.0
Fair value	525,800,000
2020 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount	500,000,000.0		$ 500,000,000.0
Fair value	503,300,000
2021 Notes
Debt Instrument [Line Items]
Aggregate Principal Amount	1,000,000,000	$ 1,000,000,000
Fair value	$ 956,700,000