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Borrowing Arrangements Fair Value Notes (Details) - Senior Notes - USD ($) | Jan. 31, 2021 | Jan. 31, 2020 | Jun. 30, 2017 | Jun. 30, 2015 | Dec. 31, 2012
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2012 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount | $ 350,000,000.0 |  |  |  | $ 350,000,000.0
Fair value disclosure | 366,300,000 |  |  |  |
$300 2015 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount | 300,000,000.0 |  |  | $ 300,000,000 |
Fair value disclosure | 341,400,000 |  |  |  |
2017 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount | 500,000,000.0 |  | $ 500,000,000.0 |  |
Fair value disclosure | 564,600,000 |  |  |  |
2020 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount | 500,000,000.0 | $ 500,000,000.0 |  |  |
Fair value disclosure | $ 542,700,000 |  |  |  |

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