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Derivative Instruments and Hedging Activities - Additional Information (Details) - USD ($) | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2014 | Nov. 30, 2014 | Oct. 31, 2014
Derivative |  |  |  |  |  |  |
Reclassification adjustments for net gains or (losses) included in net income | $ (1,527,000) |  |  |  |  |  |
Reclassification adjustments for net gains or losses included in net income |  |  | $ 200,000 |  |  |  |
Unamortized portion of the fair value of derivative contracts | 3,800,000 |  |  |  |  |  |
Change in net unrealized gains or losses | $ (742,000) |  |  |  |  |  |
Senior notes |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |
Face amount |  | $ 1,200,000,000 |  |  |  | $ 2,500,000,000 |
Senior notes due November 1, 2024 | Senior notes |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | $ 1,250,000,000
Stated interest rate | 4.65% |  |  |  |  |  | 4.65%
Treasury lock | Interest expense |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |
Reclassification adjustments for net gains or (losses) included in net income | $ 200,000 |  |  |  |  |  |
2018 Rate Lock Agreements |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |
Reclassification adjustments for net gains or (losses) included in net income | (300,000) |  |  |  |  |  |
Unamortized portion of the fair value of derivative contracts | $ 13,000,000.0 |  |  |  |  |  |
Senior notes | 2018 Rate Lock Agreements |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |
Change in net unrealized gains or losses |  | $ (13,600,000) |  |  |  |  |
Derivatives designated as hedging instruments | Senior notes | Cash flow hedge contracts - foreign currency | Treasury lock | Portion of senior notes |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  |  | $ 1,000,000,000.00
Unrealized gains (losses) on cash flow hedges |  |  |  |  | $ 7,500,000 |  |
Derivatives designated as hedging instruments | Senior notes | Cash flow hedge contracts - foreign currency | Treasury lock | 2018 Rate lock agreements |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |
Derivative, notional amount |  |  |  | $ 500,000,000.0 |  |  |

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