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Debt - Senior Notes (Details) - USD ($) | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Nov. 30, 2014 | Oct. 31, 2014
Debt Instrument |  |  |  |  |  |
Unamortized discount | $ 8,528,000 | $ 8,738,000 |  |  |  |
Treasury lock | Derivatives designated as hedging instruments | Cash flow hedge contracts - foreign currency | 2018 Rate lock agreements | Senior notes |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Derivative, notional amount |  |  |  | $ 500,000,000.0 |  |
Treasury lock | Derivatives designated as hedging instruments | Cash flow hedge contracts - foreign currency | Portion of senior notes | Senior notes |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  | $ 1,000,000,000.00
Senior notes |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Face amount |  |  | $ 1,200,000,000 |  | $ 2,500,000,000 |
Unamortized discount |  |  | $ 6,700,000 |  | $ 4,000,000.0 |
Redemption price | 101.00% |  |  |  |  |
Fair value disclosure | $ 3,820,000,000 | $ 3,700,000,000 |  |  |  |

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 + Details
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