Income Taxes, Valuation allowance and tax carryforwards (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Income taxes
Valuation allowance, related to the foreign net operating loss carryforwards and U.S. state tax credits	$ 73.6	$ 46.6
Change in the valuation allowance, related to foreign net operating loss and foreign and U.S. state credit carryforwards	27.0	$ 4.4
Foreign
Income taxes
Loss carryforwards	246.8
Operating loss carryforwards to expire or be refunded	40.2
U.S. Federal
Income taxes
Loss carryforwards	35.7
Operating loss carryforwards to expire or be refunded	1.6
Tax credit carryforwards	16.4
Tax credit carryforwards to expire or be refunded	16.4
U.S. State
Income taxes
Loss carryforwards	151.9
Operating loss carryforwards to expire or be refunded	151.9
Tax credit carryforwards	19.5
Tax credit carryforwards to expire or be refunded	$ 12.1