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Income taxes (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Income Tax Disclosure [Abstract] |  |
Income before income taxes | $ 155.8 | $ 241.8
Income tax expense | $ (34.3) | $ (51.4)
Effective income tax rate | 22.00% | 21.30%

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