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Borrowing Arrangements - Fair Value Notes (Details) - Senior Notes - USD ($) | Apr. 30, 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 |  |  | $ 350,000,000.0
Fair value | 364,600,000 |  |  |
2015 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal Amount | 300,000,000.0 |  | $ 300,000,000.0 |
Fair value | 335,700,000 |  |  |
2017 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal Amount | 500,000,000.0 |  |  |
Fair value | 551,300,000 |  |  |
2020 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate Principal Amount | 500,000,000.0 | $ 500,000,000.0 |  |
Fair value | $ 522,300,000 |  |  |

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