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Summary of significant accounting policies (Details) - USD ($) $ in Millions	May 15, 2023	Sep. 30, 2023	Dec. 31, 2022	Aug. 07, 2020
Debt Instrument [Line Items]
Long-term debt		$ 866.3	$ 1,413.8
Term Loan Facility | Amended Credit Agreement
Debt Instrument [Line Items]
Debt instrument, covenant, consideration threshold	$ 75.0
Outstanding credit facility		413.3
Line of Credit
Debt Instrument [Line Items]
Long-term debt		211.2	598.0
Term Loan | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt		202.1	362.8
Senior Notes | Senior Unsecured Notes Due August 2028
Debt Instrument [Line Items]
Long-term debt		$ 450.0	$ 450.0	$ 450.0
Stated percentage		3.875%	3.875%	3.875%

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