Derivative and hedging activities - effect of cash flow hedges on AOCI (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Derivative Instruments and Hedging Activities Disclosures [Line Items] | |||
| Unrealized gain | $ 9.3 | $ 18.2 | $ 21.3 |
| Amount of gain or (loss) reclassified from AOCI into income | 9.5 | 34.5 | $ 31.0 |
| Cash flow hedges | |||
| Derivative Instruments and Hedging Activities Disclosures [Line Items] | |||
| Unrealized gain | 0.1 | 5.4 | |
| Amount of gain or (loss) reclassified from AOCI into income | 0.4 | 21.7 | |
| Interest Rate Swap | Cash flow hedges | |||
| Derivative Instruments and Hedging Activities Disclosures [Line Items] | |||
| Unrealized gain | 0.1 | 5.4 | |
| Interest Rate Swap | Cash flow hedges | Interest expense, net | |||
| Derivative Instruments and Hedging Activities Disclosures [Line Items] | |||
| Amount of gain or (loss) reclassified from AOCI into income | $ 0.4 | $ 21.7 | |