v3.26.1
Derivative instruments and hedge accounting - Summary of Derivative Instruments Netting Agreements (Detail) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Derivative Instruments Netting Agreements [Line Items]    
Derivative assets, Gross Amounts of Recognized Assets $ 13.3 $ 3.8
Derivative liabilities, Gross Amounts of Recognized Liabilities (37.1) (7.9)
Derivative assets, Gross Amounts Offset in the Consolidated Statement of Financial Position 0.0 0.0
Derivative liabilities, Gross Amounts Offset in the Consolidated Statement of Financial Position 0.0 0.0
Derivative assets, Net Amounts Presented in the Consolidated Statements of Financial Position 13.3 3.8
Derivative liabilities, Net Amounts Presented in the Consolidated Statements of Financial Position (37.1) (7.9)
Derivative assets, Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments 0.0 (0.2)
Derivative liabilities, Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments 0.0 0.2
Derivative assets, Cash Collateral Received 0.0 0.0
Derivative liabilities, Cash Collateral Received 0.0 0.0
Derivative assets, Net Amount 13.3 3.6
Derivative liabilities, Net Amount (37.1) (7.7)
Interest Rate Hedge    
Derivative Instruments Netting Agreements [Line Items]    
Derivative assets, Gross Amounts of Recognized Assets 13.3 0.1
Derivative liabilities, Gross Amounts of Recognized Liabilities 0.0 (7.3)
Derivative assets, Gross Amounts Offset in the Consolidated Statement of Financial Position 0.0 0.0
Derivative liabilities, Gross Amounts Offset in the Consolidated Statement of Financial Position 0.0 0.0
Derivative assets, Net Amounts Presented in the Consolidated Statements of Financial Position 13.3 0.1
Derivative liabilities, Net Amounts Presented in the Consolidated Statements of Financial Position 0.0 (7.3)
Derivative assets, Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments 0.0 0.0
Derivative liabilities, Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments 0.0 0.0
Derivative assets, Cash Collateral Received 0.0 0.0
Derivative liabilities, Cash Collateral Received 0.0 0.0
Derivative assets, Net Amount 13.3 0.1
Derivative liabilities, Net Amount 0.0 (7.3)
Foreign Currency Hedges    
Derivative Instruments Netting Agreements [Line Items]    
Derivative assets, Gross Amounts of Recognized Assets 0.0 3.7
Derivative liabilities, Gross Amounts of Recognized Liabilities (37.1) (0.6)
Derivative assets, Gross Amounts Offset in the Consolidated Statement of Financial Position 0.0 0.0
Derivative liabilities, Gross Amounts Offset in the Consolidated Statement of Financial Position 0.0 0.0
Derivative assets, Net Amounts Presented in the Consolidated Statements of Financial Position 0.0 3.7
Derivative liabilities, Net Amounts Presented in the Consolidated Statements of Financial Position (37.1) (0.6)
Derivative assets, Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments 0.0 (0.2)
Derivative liabilities, Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments 0.0 0.2
Derivative assets, Cash Collateral Received 0.0 0.0
Derivative liabilities, Cash Collateral Received 0.0 0.0
Derivative assets, Net Amount 0.0 3.5
Derivative liabilities, Net Amount $ (37.1) $ (0.4)