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Borrowing Arrangements - Fair Value Notes (Details) - Senior Notes - USD ($) | Jul. 31, 2020 | Jan. 31, 2020 | Dec. 15, 2017 | Jun. 30, 2017 | Jun. 30, 2015 | Dec. 31, 2012
--- | --- | --- | --- | --- | --- | ---
2012 Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount | $ 350,000,000.0 |  |  |  |  | $ 350,000,000.0
Fair value disclosure | 369,600,000 |  |  |  |  |
Senior Notes due 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount | 300,000,000.0 |  |  |  | $ 300,000,000.0 |
Fair value disclosure | 342,100,000 |  |  |  |  |
2017 Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount | 500,000,000.0 |  | $ 400,000,000.0 | $ 500,000,000.0 |  |
Fair value disclosure | 577,200,000 |  |  |  |  |
2.85 Notes due January 15 2030 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount | 500,000,000.0 | $ 500,000,000.0 |  |  |  |
Fair value disclosure | $ 562,000,000.0 |  |  |  |  |

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