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Income tax - Schedule of Tax Character of Distributions (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Abstract] |  |  |
Ordinary income | $ 275.5 | $ 203.7 | $ 122.6
Long-term capital gains | $ 0.0 | $ 43.1 | $ 55.2

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