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Summary of significant accounting policies (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Long-term debt	$ 1,405.4	$ 1,413.8
Line of Credit
Debt Instrument [Line Items]
Long-term debt	598.0	598.0
Revolving Credit Facility | Term Loan
Debt Instrument [Line Items]
Long-term debt	$ 354.4	$ 362.8

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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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