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Borrowing Arrangements Fair Value Notes (Details) - Senior Notes - USD ($) | Jan. 31, 2020 | Jun. 30, 2017 | Jun. 30, 2015 | Dec. 31, 2012
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2012 Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount | $ 350,000,000.0 |  |  | $ 350,000,000.0
Fair value disclosure | 364,000,000.0 |  |  |
Senior Notes due 2017 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount | 500,000,000.0 | $ 500,000,000.0 |  |
Fair value disclosure | 535,000,000.0 |  |  |
Senior Notes due 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount | 450,000,000.0 |  | $ 450,000,000.0 |
Fair value disclosure | 451,500,000 |  |  |
Senior Notes due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount | 300,000,000.0 |  | $ 300,000,000.0 |
Fair value disclosure | 331,900,000 |  |  |
2.85 Notes due January 15 2030 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount | 500,000,000.0 |  |  |
Fair value disclosure | $ 513,300,000 |  |  |

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