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Share-based compensation - Common Stock Granted to Nonemployee Directors (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Share-based compensation
Income tax benefit (expense)	$ (0.1)	$ 0.0	$ 0.4	$ 0.2
Common stock
Share-based compensation
Shares granted (in shares)	8,623	0	126,213	0
Fair value	$ 0.1	$ 0.0	$ 1.3	$ 0.0
Income tax benefit (expense)	$ 0.0	$ 0.0	$ 0.3	$ 0.0

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