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Risk management and financial instruments - Derivative Financial Instruments (Details) - Interest rate cap - USD ($) | Jun. 30, 2021 | Dec. 31, 2020 | May 11, 2018
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Level 2 | Fair value, recurring basis |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative asset | $ 0 | $ 0 |
Other Assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding principal | $ 3,500,000,000 |  |
LIBOR cap |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Applicable rate |  |  | 2.87%

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