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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
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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 |  |  |  |

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