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Long-term debt (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Long-term debt
Long-term debt outstanding	$ 0.0	$ 0.0

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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