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Variable and voting interest entities - Reconciliation of Noncontrolling Interests (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance, beginning of period	$ 1.4	$ 16.7
Net income attributable to noncontrolling interests	0.4	1.1
Contributions (redemptions)	(0.3)	0.0
Balance, end of period	$ 1.5	$ 17.8

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