Income tax - Schedule of tax character of distributions (Details)

v3.22.4

Income tax - Schedule of tax character of distributions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Investment Company, Distribution, Long-Term Capital Gain	$ 43.1	$ 55.2	$ 36.7
Ordinary income	$ 203.7	$ 122.6	$ 118.0