Derivative instruments and hedge accounting - Summary of Derivative Instruments (Detail) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Derivative [Line Items]
Notional amount	$ 3,631.9	$ 2,776.5
Derivative assets	13.3	3.8
Derivative liabilities	(37.1)	(7.9)
Location, Statement of Financial Position, Balance [Axis]: OtherAssetsCurrent
Derivative [Line Items]
Derivative assets	0.0	3.7
Location, Statement of Financial Position, Balance [Axis]: OtherAssetsNoncurrent
Derivative [Line Items]
Derivative assets	13.3	0.1
Location, Statement of Financial Position, Balance [Axis]: OtherLiabilitiesCurrent
Derivative [Line Items]
Derivative liabilities	(25.6)	(0.3)
Location, Statement of Financial Position, Balance [Axis]: OtherLiabilitiesNoncurrent
Derivative [Line Items]
Derivative liabilities	(11.5)	(7.6)
Interest Rate Swaps
Derivative [Line Items]
Notional amount	1,822.3	1,849.8
Derivative assets	13.3	0.1
Derivative liabilities	0.0	(7.3)
Interest Rate Swaps \| Euribor
Derivative [Line Items]
Notional amount	877.3	904.8
Interest Rate Swaps \| SOFR
Derivative [Line Items]
Notional amount	945.0	945.0
Interest Rate Swaps \| Location, Statement of Financial Position, Balance [Axis]: OtherAssetsCurrent
Derivative [Line Items]
Derivative assets	0.0	0.0
Interest Rate Swaps \| Location, Statement of Financial Position, Balance [Axis]: OtherAssetsCurrent \| Euribor
Derivative [Line Items]
Derivative assets	0.0	0.0
Interest Rate Swaps \| Location, Statement of Financial Position, Balance [Axis]: OtherAssetsCurrent \| SOFR
Derivative [Line Items]
Derivative assets	0.0	0.0
Interest Rate Swaps \| Location, Statement of Financial Position, Balance [Axis]: OtherAssetsNoncurrent
Derivative [Line Items]
Derivative assets	13.3	0.1
Interest Rate Swaps \| Location, Statement of Financial Position, Balance [Axis]: OtherAssetsNoncurrent \| Euribor
Derivative [Line Items]
Derivative assets	4.2	0.1
Interest Rate Swaps \| Location, Statement of Financial Position, Balance [Axis]: OtherAssetsNoncurrent \| SOFR
Derivative [Line Items]
Derivative assets	9.1	0.0
Interest Rate Swaps \| Location, Statement of Financial Position, Balance [Axis]: OtherLiabilitiesCurrent
Derivative [Line Items]
Derivative liabilities	0.0	0.0
Interest Rate Swaps \| Location, Statement of Financial Position, Balance [Axis]: OtherLiabilitiesCurrent \| Euribor
Derivative [Line Items]
Derivative liabilities	0.0	0.0
Interest Rate Swaps \| Location, Statement of Financial Position, Balance [Axis]: OtherLiabilitiesCurrent \| SOFR
Derivative [Line Items]
Derivative liabilities	0.0	0.0
Interest Rate Swaps \| Location, Statement of Financial Position, Balance [Axis]: OtherLiabilitiesNoncurrent
Derivative [Line Items]
Derivative liabilities	0.0	(7.3)
Interest Rate Swaps \| Location, Statement of Financial Position, Balance [Axis]: OtherLiabilitiesNoncurrent \| Euribor
Derivative [Line Items]
Derivative liabilities	0.0	(2.5)
Interest Rate Swaps \| Location, Statement of Financial Position, Balance [Axis]: OtherLiabilitiesNoncurrent \| SOFR
Derivative [Line Items]
Derivative liabilities	0.0	(4.8)
Foreign Currency Hedges
Derivative [Line Items]
Notional amount	1,809.6	926.7
Foreign Currency Hedges \| Location, Statement of Financial Position, Balance [Axis]: OtherAssetsCurrent
Derivative [Line Items]
Derivative assets	0.0	3.7
Foreign Currency Hedges \| Location, Statement of Financial Position, Balance [Axis]: OtherAssetsNoncurrent
Derivative [Line Items]
Derivative assets	0.0	0.0
Foreign Currency Hedges \| Location, Statement of Financial Position, Balance [Axis]: OtherLiabilitiesCurrent
Derivative [Line Items]
Derivative liabilities	(25.6)	(0.3)
Foreign Currency Hedges \| Location, Statement of Financial Position, Balance [Axis]: OtherLiabilitiesNoncurrent
Derivative [Line Items]
Derivative liabilities	(11.5)	(0.3)
Foreign Currency Hedges
Derivative [Line Items]
Notional amount	1,809.6	926.7
Derivative assets	0.0	3.7
Derivative liabilities	(37.1)	(0.6)
Foreign Currency Hedges \| Location, Statement of Financial Position, Balance [Axis]: OtherAssetsCurrent
Derivative [Line Items]
Derivative assets	0.0	3.7
Foreign Currency Hedges \| Location, Statement of Financial Position, Balance [Axis]: OtherAssetsNoncurrent
Derivative [Line Items]
Derivative assets	0.0	0.0
Foreign Currency Hedges \| Location, Statement of Financial Position, Balance [Axis]: OtherLiabilitiesCurrent
Derivative [Line Items]
Derivative liabilities	(25.6)	(0.3)
Foreign Currency Hedges \| Location, Statement of Financial Position, Balance [Axis]: OtherLiabilitiesNoncurrent
Derivative [Line Items]
Derivative liabilities	$ (11.5)	$ (0.3)