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Interest rate swaps - Derivative instruments, effect on other comprehensive income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Interest rate swap |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gain (loss) on interest rate swaps designated as cash flow hedges recognized in other comprehensive income | $ 1.1 | $ (0.9) | $ 5.1 | $ 1.2

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