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Fair value of financial instruments - Fixed Rate Debt (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
2027 Senior Unsecured Notes
Debt Instrument [Line Items]
Carrying value	$ 600.0	$ 600.0
2027 Senior Unsecured Notes | Level 3
Debt Instrument [Line Items]
Fair value	571.5	558.7
2029 Senior Unsecured Notes
Debt Instrument [Line Items]
Carrying value	400.0	400.0
2029 Senior Unsecured Notes | Level 3
Debt Instrument [Line Items]
Fair value	411.4	399.0
2032 Senior Unsecured Notes
Debt Instrument [Line Items]
Carrying value	400.0	400.0
2032 Senior Unsecured Notes | Level 3
Debt Instrument [Line Items]
Fair value	$ 414.7	$ 397.2

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