Equity Appreciation Rights - Stock-based compensation cost by award type (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total Equity appreciation rights expense	$ 16.3	$ 22.1	$ 26.7	$ 27.3
EAR Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total Equity appreciation rights expense	0.0	22.1	0.0	27.3
Amended EAR Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total Equity appreciation rights expense	$ 16.3	$ 0.0	$ 26.7	$ 0.0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details